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# Evolutionary understanding of the conditions leading to estimation of behavioral properties through system dynamics

*Complex Adaptive Systems Modeling*
**volume 8**, Article number: 2 (2020)

## Abstract

One of the basic approaches in science views behavioral products as a process within a dynamic system. The mechanism might be seen as a representation of many instances of centralized control in real time. Many real systems, however, exhibit autonomy by denying statically treated mechanisms. This study addresses the issues related to the identification of dynamic systems and suggests how determining the basic principles of a collective structure may be the key to understanding complex behavioral processes. A fundamental model is derived to assess the advantages of this perspective using a basic methodology. The connection between perspective and technique demonstrates certain aspects within their actual context while also clearly including the framework of actual dynamic system identification.

## Introduction

System dynamics can be used as a tool to address many applications in a very broad sense. It applies to systems in many different disciplines, such as control, communication, tropisms, and even systems of systems (Mandl 2019). Given the very widespread use of the term “system,” the important questions are as follows: What does the term “system” actually mean? What makes a system “dynamic”? These terms cannot be defined through strict codification because a system is an abstract or vague entity (Rosen 1985). A well-formulated notion of a system could, however, be developed using a nonsystem definition. A nonsystem can be represented by a set of isolated entities that do not interact with each other or a collection of entities whose relationships have no implications for the properties or behaviors of the entities (Pattee 1973). Given how vague word definitions can be, the notions that we use describe a wide variety of things (Marchal 1975). Let us thus specify how these notions may be understood in the light of an account of a dynamic system.

First, a system is a collection of individual elements: it is not usual to talk about a system having only one component (Chen and Billings 1992). It is then likely that the elements comprising the system exhibit nontrivial interactions, for instance, coherence in terms of moving or working together [\( \chi \to \vec{f} \to f\left( {x_{i} } \right) \)]. Here, \( x \) denotes an element composed of many individuals; \( f \) is a function toward a certain direction (→), such as a goal, and \( f\left( {x_{i} } \right) \) denotes coherence, which involves certain individuals (\( x_{n} \)), but not all individuals, underlying a very well-defined goal boundary (\( f \)). The second important—indeed, key—assumption for a system is that the well-defined individuals must interact not just with one another but also with everything outside the system (Schöner 2002), which is called the environment [\( x_{t} \to f\left( {x_{i} } \right) \to y_{t} \)]. In this equation, there are two kinds of interactions that \( x_{i} \) can have with the outside environment. The outside exerts some impact (\( x \)) on them and is influenced (\( y \)) by them at a certain time (\( t \)). Thus, intuitively, a system can be defined as many interactive individual and embedded elements exhibiting a certain coherent behavior (Barabasi 2005).

Likewise, if we think about the system at any given time as defined as a set of numbers that are the values (\( x_{i} \)) of variables, the collection of a system will be defined as identical to, and specified by, the functional forms \( f_{i} \) over time (t) from time = 0 [\( \frac{{dx_{i} }}{dt} = f_{i} \left( {x_{1},\;x_{2},\,\ldots,\;x_{n} } \right), \quad \left( {i = 1,\;2,\,\ldots,\;n} \right) \)]. However, no behavior of the system can correspond to this logic, as no other systems’ behaviors are constant in time. In other words, systems are such that behaviors occur over different timescales, in the same way that the behaviors of a group of people while ice skating occur over different timescales (Borgonovi et al. 2019): every event should be the initial condition for the next slice of time, and every division should set the stage for the next. The coherence of performance of the people (on the ice) must be nested dynamically within a continuous time interval (Chen and Billings 1992). Thus, if we consider that there are certain continuous approximations using finite intervals of time between changes of state within an interval, the system can be absorbed into a new functional type of organization [\( \frac{{dx_{i} }}{dt} = g_{i} \left( {x_{1},\; x_{2},\, \ldots ,\;x_{n} - 1} \right), \quad\left( {i = 1,\; 2,\, \ldots ,\; n - 1} \right) \)].

In this logic, the system contains two variables, each of which is absolute but each of which changes suddenly to the other in the field (Schöner 2002). This may be a product of multiple causes by which any individual changes its behavior dynamically (Ashby 1947). At this point, the questions of “What is a system?” and “What makes a system dynamic?” seem to be recognized with regard to the picture, and the situation seems far less static.

## Part 1: Nonrepresentational perspectives of phenomena (theoretical basis)

There is a well-defined assumption called the problem of impoverished entailment (Shaw 2001), which is the minimal starting point for understanding any system of interest at any level of interest. “X is about Y” is true only if “X entails Y” and “Y entails X” are true. This is a loop of entailment; the specificity of X to its source of Y means that X entails the source by which X is entailed. Diagrammatically, an entailment can be expressed as X→Y. The primary property of an entailment is that it propagates “truth” hereditarily—Y inherits the truth of X (Rosen 1991). Thus, the loop of entailment can be shown diagrammatically as X→Y→X, and the diagram can be read as meaning that truth propagates hereditarily in both directions. Such an explanation focuses on assembling all parts of elements [*C*(*s*)] along with the other “things” that can influence them or be influenced by them [*E*(*s*)], even the internal structure of the system [*S*(*s*)] (Mahner and Bunge 1997).

In this framework, when \( m \) is predicated as a mass of a particular object, it identifies a substantial property intrinsic to the object that is identical whenever and wherever the object is observed. However, \( m \) has other relational properties that engage actual things. For example, when the object is grasped and brought down hard and repetitively on another object, then \( m \) can be a “hammer” with respect to the object. Conceivably, there are many relational properties that the object may have by virtue of its relationship either with other objects or with perceivers-actors, but these are, at best, indefinite properties until a particular spatiotemporal relationship is effected (Gibson 1979). When this occurs, one of the many potential relational properties of the object is actualized.

However, investigating the dynamics in these cases typically requires a significant number of elements and obviously includes multiple components that must be managed. According to researchers (Bernstein 1966), organisms have too many degrees of freedom. Moreover, if the parts are considered to be very strongly defined by their connections and to function within the context, great complexity can be observed (Rosen 1987). When even a single cell’s behavior is being considered, its tendencies do not allow certain prediction of all of these dynamics (Ford 2008; Strong and Ray 1975), and this prompts deep concerns over how to treat the cell relevantly as well as raising questions about how these behaviors form from numerous factors.

Instead of positively interpreting the system’s dynamics in terms of every encoded equation, the key idea is to describe why numerous modes of emergent phenomena underlying local-level interaction have to be governed by simple rules (Iberall and Soodak 1987). Where elements are given a simple set of rules that govern their behavior and allow them to interact to determine what patterns emerge over time, it has been shown that an agent’s behavior with respect to unpredictable phenomena can arise even with elementary governing rules (Roundy et al. 2018). This fresh perspective on refocusing a system’s dynamics is helping to bridge traditional biases and has been stimulating scientists to distil out simple principles, such that a better understanding of a dynamic system (which is not always very complicated) may be gained.

## Part 2: Individual behavior in social dynamics (model-based)

To explore the rule of thumb from a broader perspective, computer simulation has been performed first on the basics of a spatially explicit model of mobile agents in continuous space (Rangel et al. 2018) to determine the basic regulatory principles involved in the way they conceptualize their environment (Bonabeau 2002). In other words, the implemented model shows the potential to infer how simple individual rules can lead to consistent group behavior and how slight changes in those mechanisms can have a dramatic impact on an individual’s behavioral patterns (Reynolds 1987). Although an analysis of simple implication is an apparent first step in providing proof of concept, this individual-based simulation has become significant enough to be tested in a broader range of applications for evolutionary dynamics for the following reasons. First, as the agents represent individuals who have participated from the bottom up, the actual state of their behavior tends to be more informative (agent-based modeling) than in other cases. Next, as the main point of this implementation is a description that deals with the state per time as the critical factor in its allocation of neighbors, the number of neighbors placed on the position is based on the moves scheduled for a given moment (context-varying cultural evolution) (Oliva 2016) [see “Methods I (agent-based model)” for more detail].

### Result

The model provides a natural description of a pattern of behavior and allows us to understand a realistic adaptation incorporating behavioral algorithms with social dynamics. The mechanisms characterized in the agenda show that the model has the capacity to produce three types of factors. First, the behavioral pattern is the result of the applied individual components; this comes not only from the initial conditions of the autonomous agents but also from the fact that they are interconnected. Second, the range of different combinations of the internal and the external states plays a part in the rapid propagation in the system (see Fig. 1-1). Third, however, when the interconnected relation between the internal trait underlying its external trait is applied, the widespread heterogeneity of the mechanisms can abstract the repertoire of displayed behaviors (see Fig. 1-2) (see Additional file 1: 1.4 for more detail).

The primary feature of the agents’ interactions is heterogeneous in this abstract setting. As the topology of the interaction traits can lead to significant deviations from the predicted pattern of behavior, it may generate various effects that mimic the behavior of real individuals in social dynamics. At the points where these individuals interact, sensible decisions occur, in line with an empirical study showing that individuals learn how to keep relative velocity as a key factor for homogeneity (McLeod and Dienes 1996).

### Discussion

The simulations show that different interconnection structures have an effect on which strategies perform better, a relationship referred to as ecological rationality. The results may suggest that the relative velocity can be the pure candidate and works effectively. According to researchers (McLeod and Dienes 1996), if an object (i.e., a ball) is already high in the air and travelling directly in line with the individual (i.e., the player), the individual might utilize some simple heuristics. Namely, the individual fixes his gaze on the object, starts running, and adjusts his velocity to ensure that the angle of the ball above the horizon appears constant (Gigerenzer 2004). The prediction is not that the individual runs to a precomputed landing spot and waits for the object but that he modifies his actions to keep the image of the object moving at a constant velocity. It is also possible that individuals do not compute (\( \vec{v} \)) at all in this model but would reduce a maintained value of \( d^{2} \left( {\vec{v}} \right)/dt^{2} \) in a systematic way. As \( \vec{v} \) increased, they would keep \( d^{2} \left( {\vec{v}} \right)/dt^{2} \) at zero [\( d^{2} \left( {\vec{v}} \right)/dt^{2} \) = constant] (Reed et al. 2010). This is related to what information can be derived as a strategy in the system and how that information can be best obtained through the dynamics.

This result also holds for a step progression toward such a relationship, as explicitly shown by the dramatic change in regard to the point where [\( d^{2} \left( {\vec{v}} \right)/dt^{2} \) = constant] reaches [\( d^{2} \left( {\vec{v}} \right)/dt^{2} \ne \) constant]. Let us suggest that actualized observation of the pattern corresponds not simply to the object’s velocity but, instead, to changes in the velocity between individuals at a certain point. In other words, the actual displacement (\( S \)) estimated is given by (\( S_{{l^{1} }} = S_{l} + \alpha d^{2} \)). Here, the observed new displacement \( \left( {S_{{l^{1} }} } \right) \) is equal to the displacement across the individuals (\( l^{1} \)) plus its relative velocity \( \left( \alpha \right) \) multiplied by the distance squared \( (d^{2} ) \) from the neighbor. This indicates that the farther an individual is from the neighbor (role model or group heading), when measured at a certain point, the more difficult it is for the individual to follow the neighbor because of the greater acceleration involved. On this assumption, the results might suggest a strategy such as evolvable traits or payoff functions to guide the evolution of these heuristics through social learning (see Fig. 2).

## Part 3: Elementary coordination in circadian rhythm (experimental-based)

One useful strategy of obtaining simplicity through system dynamic looks for cycles at all time scales (McGhee and Jain 1972) and aims to show how interacting cyclic processes (Collins and Stewart 1993) account for the emergence of new entities (Shaw and Kinsella-Shaw 1988; Turvey and Carello 2012), many of which are similarly cyclic (Yadlapalli et al. 2018). The central idea is that Earth’s cycles—geophysical, hydrological, meteorological, geochemical, and biochemical—have interacted to create self-replicating living systems that conform to specific cyclicities (Maury et al. 2010). This assumption has led us to enquire whether something akin to attunement to the environmental 24-h day/night cycles (Maury et al. 2010) may be apparent in an experimental setting of bimanual coordination, a context that has been used to examine self-organization in biological systems (Kugler and Turvey 2015).

The present study used two main ways of determining these characteristics and discovering if approximations under certain conditions serve these self-potentials (see Additional file 1: 2.1 for more detail). The first involves an increase in the capability to self-generate forces along the lines of the roles of the fundamental dimensions of environments (temperature embedding in light–dark cycles). To achieve this, the experimental setting asks, “Is our system influenced by an ecological feature?” by embedding a bimanual coordination task in an ordinary 24-h day–night cycle (5:00, 12:00, 17:00, and 24:00). The second is tied to observing the availability of an internally based source (coordination) or sources of force (stability and entropy) within dynamical boundaries in systematic ways. The setting asks, “How does our system adapt to regular or irregular thermal structures?” by embedding the comparison of normal and abnormal day–night circadian temperature effects at dawn (5 a.m., approximately when the core temperature reaches its minimum) and dusk (5 p.m., approximately when the core temperature reaches its maximum) (Aschoff 1983) (see “Methods II (experimental-based model)” for more detail).

### Result

A variety of measures (e.g., phase shift, variability, entropy) were examined for evidence of entrainment or any influence of the embedding rhythm on stability or attractor location (only entropy production was suggested for the main results; see Additional file 1: 2.3 for the entropy calculation). With respect to experiment 1, the behavioral performance (entropy) shows a maximum at 5:00 but has a more clearly defined minimum at approximately 17:00 in the day–night cycle, while the core body temperature rhythm shows a minimum at 5:00 but has a maximum at approximately 17:00 (see Fig. 3-1).

Regarding experiments 2 and 3, the entropy was affected by the temporal locus during the circadian cycle, as well as by the introduction of a heated vest (Experiment 2) and an ice vest (Experiment 3); the effects of the thermal manipulation were not identical (see Additional file 1: 2.1.4 for the temperature measure). Even if the same external temperature perturbations were given, the influence of the vest was negatively exaggerated (increasing entropy) at dawn but positively exaggerated (decreasing entropy) in the evening (see Additional file 1: 2.2 for more detail).

The estimated dynamics from the relative phase between two limbs, oscillatory coordination, was affected by the temporal locus during the circadian cycle (see Fig. 3-2). The results at this biological scale correspond to a theoretical study that has shown that the rate of entropy production is changed when a new energy source is accessed via a nonequilibrium phase transition process (Frank 2011).

### Discussion

The organism may convert its own internal energy so efficiently that it is able to produce anything physically possible (England 2013). These results from Experiments 1, 2, and 3 reflect that accessing a new energy source differs as a function of the circadian cycle and that access can be manipulated by a temporary thermal manipulation. Given the very widespread use of these features, what types of essential properties are involved in the extended emergent elementary dynamics between oscillators? According to researchers (Pikovsky et al. 2003), the basic element of the coordination (\( \upphi \)) is equal to \( \upphi \) (\( x^{{\theta_{1} - \theta_{2} }} = \upphi \)), and such an equation resembles the log base \( x \) of, which is equal to \( \theta_{1} - \theta_{2} \). Then, with respect to the experimental results, the essential foundation of the symmetry dynamics between oscillators (ɸ), the preferred elementary frequency of the individual segment of \( x \) to the other relative phase from the intended phase, is nearly equal to the slightly asymmetric potential (\( x^{{\upphi_{ave - } \upphi_{0} }} = \Delta \omega \)). Thus, if this logic simply keeps going and the outcome is observed in terms of the approximate relative stability of this coordination dynamic, this logic will have “\( x \) to the variation of the relative phase (\( h\upphi \)) is equal to \( \theta_{1} - \theta_{2} = \upphi \) multiplied by \( {{\Delta }}\omega \)”. That is identical to [\( x^{h\upphi } = \upphi \cdot \left( {\Delta \omega } \right) \)], and this dynamic potential will finally be dependent on \( \left[ {\Delta \omega \left( {rad*x^{ - 1} } \right), rad = radian} \right] \). Pervasive interconnectedness—everything is connected with another thing or other things—suggests that behavior is adapted to perceiving both the nested environmental properties and one’s own nested behaviors—a union that organizes actions on surrounding circumstances (Reed 1996). The observation of the direct and robust relationship between biological aspects (body temperature and motor synchrony) and an environmental process (circadian temperature cycle) may echo the adaptation of our system to the environment (Iberall 1977).

## Part 4: Approximated common property of the behavioral patterns

Under these observations, a system may be found to exhibit a variety of hitherto unobserved dynamical behaviors, including cultural evolutionary characteristics and the coexistence of multiple search strategies (Arena et al. 2018). This study proposes that the features investigated are a particularly appropriate assumption in terms of obtaining simplicity from complexity.

The expression \( h\left( x \right) \) represents our way of modeling that denotes wherever and whenever the evolutionary system is observed. This model takes \( \left( x \right) \) and inputs \( \left( x \right) \) into \( \left( s \right) \) and obtains \( \left( {s\left( x \right)} \right) \), and then the model inputs that into the \( \left( m \right) \) and finally takes \( m\left( {s\left( x \right)} \right) \). Going back to the insight by researchers (Mahner and Bunge 1997; Turvey 2018), related to the minimal starting point for understanding any system as a function of interest at any level of interest (see Eq. 1), (*s*), this includes the collection of all parts of elements [*C*(*s*)] and comprises all other things influencing them [*E*(*s*)], even the internal structure of the system [*S*(*s*)]. Thus, we input \( \left( x \right) \) as arranged as \( \left( {x^{ - 1} } \right) \) so that it somehow provides us with intuition about a system’s fundamental properties \( \left( s \right) \). This property and the inputs into function \( \left( m \right) \) help us get to the point of understanding any system based on the system of interest at any level of interest.

As we take this composite function, it models a system that starts with individual segments \( \left( x \right) \) as the input, and it shows the minimal starting point of the system \( \left( s \right) \) that will be dependent on the relative individual distance. Thus, how should a system that can be identified or predicted (*h*) be related to how it depends on the individual segments in a given context? (Melchers and Beck 2018). The fundamental properties demonstrated may be able to create a useful system dynamics reference so that this functional pattern can be applied to various phenomena (see Fig. 4).

Oddly enough, those curiosities might be able to have the same general answer: creation of sophisticated functions from simple elements. There is possible evidence for the association of this property when we compute an approximation of its sensitivity to initial conditions; staying close can show the possible entity as a function of the system’s own unique set of behavior in the long-time limit [\( {{\lambda }} = \mathop {\lim }\limits_{n \to \infty } \left( {r_{k}^{n} } \right)^{{{\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 n}}\right.\kern-0pt} \!\lower0.7ex\hbox{$n$}}}} \)]. Here, logic can set the object’s crucial variable (\( r_{k}^{n} \)) that causes the different value in both dynamics to be considered simply (\( {\raise0.7ex\hbox{$1$} \!\mathord{\left/ {\vphantom {1 n}}\right.\kern-0pt} \!\lower0.7ex\hbox{$n$}} \)) arranged in certain rules (i.e., exponential). This function reflects that the sort of highly sensitive components was associated with a rate of change, which increased or decreased at a certain point (Rosenstein et al. 1993) by measuring the contraction (stable system) or expansion (chaotic system) near the orbit of distance [\( d\left( {x_{0} ,x_{0} + \varepsilon } \right) \)] during the next iteration of distance [\( d\left( {f\left( {x_{0} } \right),f(x_{0} + \varepsilon )} \right) \)] (see Fig. 4 dots surrounded by yellow colors [Response]). That is, the simple rules in regard to what the dynamics provide as the primary characteristics that show the simple function can serve as the basic principle to use when investigating various patterns (Mead 2017).

## Conclusion

One type of logic has focused on the orderly systems underlying the perfect relationships of one point to another (Gaskell and Laughlin 2017). That is to say, there is a direct connection owing to the effect that arises directly from a cause. It follows that if we know the present state of the system, the system can fully determine its past and future state. Although this approach has proven to be a very good means of approximation for describing reality in various fields, the real world in which we actually live is not always covered by these principles (Lear 2012). Most of one’s experience might not be due to this type of direct relationship. An important concept for the system, i.e., iterating a simple function, even generates the irregular geometric patterns we see in nature from such a structure (Rian and Asayama 2016). This indicates that there can be an output greater than the sum of the constituting parts due to synergetic relations or less than the sum of its individual components due to the relationships with interference (Haken 2012).

Regarding this assumption behind the simulations which estimated the possible principles of affirmative evolutionary capabilities of a system (Edelman 2016), this study addresses the issues related to the identification of dynamic systems and suggests how determining the basic principles of a collective structure may be key to understanding complex behavioral processes. Distinct approaches (theoretical, modelling, and experimental) were used in an effort to understand how to recognize the basic feature through the dynamics of the system. The condition leading to the behavioral property under these different perspectives suggests that it is not reliant on an individual lodged in the corner of the system. Rather, if the fundamental condition is in place, the dynamics of the system falls into the same rules (Iberall and Soodak 1987) that are estimating the pattern (Rosen 1985). Our validation still needs to be polished against what happens in various fields and then further extending the model, but in general, the approaches and mechanisms achieved here could be useful for researchers and those who need to understand dynamics in phenomena itself.

## Methods I (agent-based model)

The model first considers the agents try to move toward somewhere while steering with other individuals in the group. Thus, each has its position, velocity, and exploration, which are initialized to values randomized within specified continuous space. However, at the same time, their pattern of behavior depends not only on the autonomous individuals’ initial state but also on its external states. In other words, to control which agents interact, when they interact, and how they interact, the mechanism holds internal traits as a tradeoff (between the individual velocity and group velocity) and external traits as a network characteristic (social ties multiplied by a mutation rate). The rules and processes in the artificially modeled structure describe an individual’s homogeneous drives, and the mechanism behind this process is based on the social learning in which successful strategies are propagated through imitation (see Additional file 1: 1.3 for the model variables).

### Operating principle

The agents are physically related to each other on some spatial representation allowing them to move anywhere in the space. The set of n-tuples of a real number, denoted by \( {\mathbb{R}}^{n} \), is called n-spaces [\( x = \left( {x_{1} , x_{2} , \ldots , x_{n} } \right) \in {\mathbb{R}}^{n} \)]. A particular n-tuples in \( {\mathbb{R}}^{n} \) is a point which called the coordinates, components, or elements of \( x \). This is one of the standard ways in which the agents can continue to move in the space. The agents then move within the boundaries of the plane steering toward somewhere.

where the \( \vec{a} \) is the group’s heading and \( \vec{b} \) is each agent’s (\( i \)) coherence toward the center of the group. The order (\( \vec{u} \)) is symmetric because all the agents are identical; thus individuals are naturally heading together in a certain direction, while at the same time maintaining a certain distance from each other as their inherited survival strategies (Jadbabaie et al. 2003).

The model, then, includes another operation with respect to the individual’s current movement (\( \vec{v} \)) written simply by (\( \vec{\omega } = \vec{u} + \vec{v} \)). That new quantity of \( \vec{\omega } \) is the sum of \( \vec{u} + \vec{v} \), where the vectors stay away from the origin. The way we define this is that each vector represents a certain movement; a step with a certain distance and direction in space. If we take a step along the first vector of the \( \vec{u} \), and then a step in the direction and distance described by the second vector of the \( \vec{v} \), the overall effect is just the same as if we had moved along the sum of those two vectors to begin with (see Fig. 5).

The first quantity here (green line) has the coordinate (\( \vec{u} = \left[ {\begin{array}{*{20}c} 4 \\ 1 \\ \end{array} } \right] \)), and the second quantity (blue line) has the coordinate (\( \vec{v} = \left[ {\begin{array}{*{20}c} 1 \\ 2 \\ \end{array} } \right] \)). When we take the sum of the two quantities, we can see a four-step path from the origin to the tip of the second quantity: move 4 to the right and 1 up, then move 1 to the right again and 2 up. To rearrange these steps, first move 4 + 1 to the right, then move 1 + 2 up; the new quantity (black line) has coordinates 4 + 1 and 1 + 2 from the origin. Exhibited in this list-of-numbers conception is a matching up of their numerical terms, and an adding them both together (\( \vec{\omega } = \left[ {\begin{array}{*{20}c} {4 + 1} \\ {1 + 2} \\ \end{array} } \right] = \left[ {\begin{array}{*{20}c} 5 \\ 3 \\ \end{array} } \right] \)). With this fundamental process, especially, we see that the second quantity of \( \vec{v} \) contains the individual’s trait (agent-self interactions: agents can interact with themselves), based on its condition holds;

where the function assumes that the attribute of the component is conditional upon the value yield in the other direction (−), if the length of the magnitude \( \left\| {v_{i} } \right\| \) is greater than the other length (\( \left\| {v_{avg} } \right\| \)). This trait is implemented according to quantity as follows:

where the \( \vec{v}_{i} \) is the individual’s velocity represented by the length of the individual’s magnitude (\( \left\| {v_{i} } \right\| \)) with the direction of individual (\( \vec{d}_{i} \)). The \( \vec{v}_{avg} \) is their average velocity which includes the entire population of N individuals’ navigation. The result of the \( \vec{v}_{i} \) and the \( \vec{v}_{avg} \) produces a new quantity \( \vec{v}_{inew} \) written simply as (\( \vec{v} \to \vec{v}_{inew} = \vec{v}_{i} + \vec{v}_{avg} \)). Going back to the conditional (IF) assumption with this individual quantity, if the object (\( \vec{v} \)) faces the parameters (\( \vec{u} \)) with the states of their quantities (\( \left\| {v_{i} } \right\| \) and \( \left\| {v_{avg} } \right\| \)), the condition set produces an opposite direction (±) depending on its norm as follows:

where \( \vec{\omega } \) is a new position vector of the individual updated by the inherited trait \( \vec{u} \) with the individual’s current movement \( \vec{v} \). This is a linear combination (or inverse transformation = 180° counterclockwise), something that takes in inputs and spits out an output for each one;

Imagine that every possible input vector multiplied by the matrix moves over to its corresponding output vector multiplied by the matrix (or inverse) without becoming curved and that the origin must remain fixed in place; what the coordinates are is determined by where each basis vector lands (see Fig. 6).

This refers to the fact that the model’s basic pattern of group behavior depends on the value of \( \vec{v} \) with a localized view of the initial conditions of the randomly initialized point; increasing the individual’s quantity \( \vec{v} \) underlying the group’s initial condition \( \vec{u} \) causes their portrait to diverge (dotted blue line) or converge (dotted red line). Such a fundamental operation allows us to reach every possible point (not as an arrow but actually as a single point) in the plane, considering every possible linear combination that we can obtain from the two dimensional quantities.

Based on these functions, the element \( \vec{v} \) then contains a more detailed algorithm of how the individual’s new position was implemented in which a subset holds that (i) the zero vector belongs to \( \vec{v} \), and (ii) vectors and any multiplication of scalars is also in \( \vec{v} \). Such a mechanism is dependent on quantity as follows.

### Movement characteristics (internal source)

First of all, the new position dynamic is augmented by the designated trade-off value (Woodworth 1899) of the individual velocity-group heading [IGT: individual’s velocity up (\( \vec{v}_{i} \)) resulted in a loss of group heading (\( \vec{v}_{avg} \))] as follows;

where \( \vec{v}_{i} \) is the velocity of each individual, \( \vec{v}_{avg} \) is the average velocity about group heading, and the value of \( k \) is a scalar that controls their trade-off. For example, the product of a \( \vec{v}_{i} \) by a scalar \( k \) is a vector \( \left\| k \right\|\vec{v}_{i} \) with magnitude \( \left\| k \right\| \) times the magnitude of \( \left\| {v_{i} } \right\| \) and with direction \( \vec{d}_{i} \), the same as or opposite to that of \( \vec{v}_{i} \), according to whether \( k \) is positive or negative [if \( k = 0 \) (null vector) \( \left\| k \right\|\vec{v} \) has zero magnitude and no specific direction]. This means that every new position vector will be a combination multiplied by the scalar [\( (c_{1} = 1 - \left\| k \right\|), (c_{2} = \left\| k \right\|) \)];

and, the mechanisms obtain (see Fig. 7):

where the different angles of the arrows are from \( \vec{v}_{inew} \) and the spaces inside the arrows are from the multiplied scalar (\( \left\| k \right\|, \left\| k \right\| \in \left[ {0,1} \right] \)). This gives us a global view so that we can conceptualize the list of quantities in a visual way and thereby simplify and clarify basic operational patterns.

### Network characteristics (external source)

The model then includes another characteristic for dealing with more or less distinct patterns of behavior. In social practice, just as individuals are more likely to change their decisions depending on the influences surrounding them (Demsar and Bajec 2013), so the individual’s new quantity (\( \vec{v} \)) holds its network characteristics as given;

where \( \vec{v}_{s} \) is a vector with a length \( v_{s} \) and direction \( \vec{d}_{s} \) as a function of the network density (ND). The network density arises from its social ties (Santos et al. 2006) based on the nodes and calculated by its actual connection (AC) with the potential connection (PC) of the network.

where the network density (\( \left\| {v_{s} } \right\| \)) describes the potential connections in a network that are actual connections (\( AC/PC \)). The potential connection (\( PC = N\left( {N - 1} \right)/2 \)) is a connection that could potentially exist between two individual regardless of whether or not it actually does (see Additional file 1: 1.1 for more detail). These small linear contributions to their dynamics, and this structural instability can be interpreted as the network characteristics being influenced by the exploration rate (\( k^{\prime} \) = scalar), which corresponds to a mutation term in genetics given as:

where \( k^{\prime} \) controls how fast the transition function propagates in the network, and the new position vector considers its network density as another quantity [\( (c_{3} = \left\| {k^{\prime}} \right\|) \)]. For example, as previously:

The new position is then:

In the presence of the network density, the system settles down into a state with a more pronounced increasing (or decreasing) mutation rate in every update step, and it yields (see Fig. 8):

### Interdependency between the two traits

With these implementations, instead of the widespread extension underlying the combination, the model proposes to adopt an existing possible interconnected relationship between the network and its movement characteristics. Let us think about simple interdependency between the two components (trade-off between individual velocity and group heading as an internal, network density multiplied by mutation as an external). If the individual’s tendency is very remote from the group’s purpose, its mutation in the system will not propagate to the individuals, or vice versa. For this application, the new position mechanism assumes that the social network characteristics (\( \left\| {v_{ss} } \right\| \) = scalar) are a denominator applied by the index of difficulty (\( id \) = scalar) as a numerator.

where \( \left\| {v_{id} } \right\| \) is the scalar as a function of the ratio between the two objects [2D = size of the trade-off (\( k \)) between two objects about \( \vec{v}_{i} \) and \( \vec{v}_{avg} \)] divided by the width of the object [W = arbitrary value corresponding to the individual’s size or reputation. For example, when \( \left\| k \right\| \) is 0.1 applied to the \( \left( {1 - \left\| k \right\|} \right)*\vec{v}_{i} + \left\| k \right\|*\vec{v}_{avg} \), the 2D becomes large (i.e., 0.8); on the other hand, when \( \left\| k \right\| \) is 0.4, the 2D becomes small (i.e., 0.2)]. This leads to a simple interpretation linking the vector as follows;

and, the mechanisms yields (see Fig. 9):

Notice that the combination of these arrows refers to this model’s fundamental feature. The characteristics of every rule and process that are applied (or will be applied) in this model must be within this functional dynamic. This provides an excellent way of conceptualizing many lists of individuals in a visual way, which can clarify patterns in mechanisms. It also shows a global view of what certain operations do to describe how an individual is being manipulated in space using numbers that can be run through a computation.

The model now considers an adoption probability which is given by an estimate of \( \vec{v}_{inew} \) by the individuals. Indeed, as each individual may not know the exact value of the trait that has adopted the other’s \( \vec{v}_{inew} \), this model yields that they can estimate the value at every schedule of each generation via the comparison given.

where \( p \) is the probability acceptance of the role model for imitation, \( \pi_{f} \) is a payoff (velocity) of the focal individual, \( \pi_{r} \) is a payoff of the role individual, \( e \) denotes the exponential, and \( \omega \) is the intensity of the selection (\( \omega \) < 1 = weak selection, \( \omega \to \infty \) = strong selection). The focal individual imitates the strategy of the nearby role individual, comparing its new position vector (large \( \Delta \pi \) = velocity difference large, small \( \Delta \pi \) = velocity difference small), and then the focal individual chooses to imitate the strategy of the role individual (see Additional file 1: 1.2 for different implementation cases for the \( \pi \)).

## Methods II (experimental-based model)

The present model used two main ways of determining these characteristics and discovering whether approximations under certain conditions serve these self-potentials. The first involves an increase in the capability to self-generate forces along the lines of the roles of the fundamental dimensions of environments (temperature embedding in light–dark cycles). To achieve this, the experimental setting asks, “Is our system influenced by an ecological feature?” by embedding a bimanual coordination task in an ordinary 24-h day–night cycle (5:00, 12:00, 17:00, and 24:00). The second is tied to observing the availability of an internally based source (coordination) or sources of force (stability and entropy) within dynamical boundaries in systematic ways. The setting asks, “How does our system adapt to regular or irregular thermal structures?” by embedding the comparison of normal and abnormal day–night circadian temperature effects at dawn (5 a.m., approximately when the core temperature reaches its minimum) and dusk (5 p.m., approximately when the core temperature reaches its maximum) (Aschoff 1983) (see Additional file 1: 2.1 for more detail).

### Circadian rhythm of temperature (external source)

The core cycles of a biological system are influenced by temperature, with 24-h light–dark oscillation (called circadian rhythm), as well as by biochemical, physiological, or behavioral processes that persist under constant conditions with a period length of ~ 24 (Soodak and Iberall 1978). Presumably, due to inputs to the thermoregulatory centers from the body core (Refinetti and Menaker 1992), the circadian rhythm of biology shows a minimum at 5:00 (when core body temperature is rising most rapidly) but has a more clearly defined maximum at about 17:00 in the daylight (when core body temperature is falling most rapidly) cycle (Moore 1995) (see Fig. 10).

This circadian change (in core temperature) is most likely due to the rhythmic input from the suprachiasmatic nuclei (SCN) acting upon the hypothalamic thermoregulatory centers and altering the thresholds of cutaneous vasodilatation and sweating (Krauchi and Wirz-Justice 1994). Specifically, melatonin appears to contribute to this change, as its rate of secretion increase in the evening, and this increase promotes a fall in body temperature via cutaneous vasodilatation (Cagnacci et al. 1997).

As the information is accessible, people are familiar with how such a process can fluctuate and how it can be explained by the interaction between the internal (homeostatic) and the external (circadian) situations (Aizawa and Cabanac 2002). There is ample evidence of the effect of the ecological climate on various aspects of the process. Heat exchanged with the environment by means of convection and radiation allows a gradient to be formed between the body core and temperature (Borb and Achermann 1999; Walther et al. 2002). The rhythm in the core temperature produced by this change is generally promoted by other rhythms, including the body clock, sleep, and physical and mental activity, raising the possibility that the disruption of circadian rhythms can contribute to complications in the human system (Maury et al. 2010). These changes in the interior temperature in the body, as opposed to the peripheral (core temperature)—both in animals and humans—are mainly due to circadian rhythmic changes in the rates of ecological impacts (Edholm et al. 1973).

However, given that precise control of the internal substance (SCN) as a generator of biological circadian rhythm is unclear, the circadian rhythm of the core body temperature appears to be generated by periodic variation in heat production and heat loss (Waterhouse et al. 2005). For instance, changes in heat loss via convection and radiation are primarily caused by variations in skin blood flow, with consequent changes in skin temperature. In particular, when the subject is performing mild activities, where a decreased temperature is not matched by a thermal load, it has been shown to be very effective in describing the thermal responses to activity carried out at different times of the day (Aschoff et al. 1972).

When one considers the submaximal activity changes following a brief period, say, at a certain temperature level (Aldemir et al. 2000), one may see initially that the response to the same amount of moderate activity in the minimum circadian rhythm differed from that in the maximum circadian rhythm. The mechanisms responsible for these different temperatures of the core and musculature during daylight cycles, as a result of normal or non-normal ambient temperatures, will alter a range of performance factors, including the thermoregulatory response to activity. These results fully substantiate the predictions based on the hypothesis describing a circadian rhythm in thermoregulatory responses and indicate that this hypothesis applies to biological adaptation regarding certain ecological variables.

### Elementary coordination (internal source)

Formation and retention refer to propriospecific information about the states of the muscular-articular links, and the dynamical criteria of the stability pattern constrain the patterns or characteristics. To be specific, let us consider a qualitative physical system such as stiffness, damping, and position over time in a dynamical mass-spring system as given.

Here, \( m \) is mass, \( b \) is friction, and \( k \) denotes the stiffness. The variable t is time, \( \chi \) denotes the position, \( \chi^{\prime} \) is velocity, and \( \chi^{\prime\prime} \) represents acceleration. In physics, because damping is produced by a process that dissipates the energy stored in the oscillations, the interplay between input and damping approaches a stationary fixed point in the long-time limit.

Such systems possess a static equilibrium point, which is called a point attractor (Kugler et al. 1980) (see Fig. 11). The property of this dynamic has been applied not only to a physical system but also to descriptions of the human neuromuscular level (Kugler and Turvey 2015). This function involves an investigation of the intact movement of a limb oscillator in terms of muscle-joint kinematic variations (kinematic position, velocity, acceleration) over time. When we are asked to swing two limbs comfortably, this can be characterized by the pendulum’s dimension (Kay et al. 1987), namely, simplifying the point attractor while restricting it to certain domains of phase space [(\( \theta 2 - \theta 1 \approx 0 \)), (\( \theta 2 - \theta 1 \approx \pi \))]. In this equation, with the phase difference, \( \theta 2 - \theta 1 \approx 0 \) denotes a condition of nearly synchronized in-phase, and \( \theta 2 - \theta 1 \approx \pi \) indicates that this in an anti-phase. The observed relative phase or phase relation (ϕ) between two oscillators at ϕ ≈ 0° (in-phase), or ϕ ≈ 180° (anti-phase) have been modeled as the point attractors in our limb system, as they are purely stable patterns (Turvey 1990).

In the observed relative rhythmic segments patterns, the in-phase ϕ ≈ 0 condition is more stable than the anti-phase ϕ ≈ π condition. Inspired by a number of studies on the 1:1 frequency locking of the left- and right-hand phase defined as \( \upphi = \left( {\theta_{L} - \theta_{R} } \right) \)—the difference between the left (L) and right (R) phase angles (ϕ)—has led to the identification of important invariant human system features (Kelso 1984).

In this equation, ϕ is the phase angle of the individual oscillator. In addition, \( \alpha \) and \( {\text{b }} \) are coefficients that denote the strength of the coupling between the two oscillators. The relevant regions of the parameter space allow the potential \( {\text{V}}\left( \upphi \right) \); the negative signs in front of the coefficients simplify the equation of motion. A relative 1:1 frequency-locked coordination phase [\( {\text{V}}\left( \upphi \right) \)] is determined by the differences between the continuous phase angle [\( - \alpha \cos \left( \upphi \right) - b \cos \left( {2\upphi } \right) \)] of the oscillator’s two components: the stability of the point attractor can be varied by varying the pendulum’s dimensions (see Fig. 12).

This function indicates that the minima of the potential are located at ϕ = 0, and that \( \upphi = \pm {{\uppi }} \) (Haken et al. 1985). Given this scenario, the function can be estimated in terms of how the potential will change in shape, as the control parameter (energy cost) increases. Based on the observed mechanism for the point attractor with a simple function, the present model proposes the in-phase bimanual rhythmic coordination synchrony pattern as a particularly well-suited physical source. This allows a useful reference for system stability coordination tasks in which this functional pattern can be applied to all human movement, muscles, and even a neural network. Actual intersegmental coordination, however, is additionally shaped by the contingencies of adjusting to environmental vagaries. How these extrospecific requirements and information types are incorporated into the physical stability patterns can be assumed by the level of symmetry coordination (Amazeen et al. 1998). In order to harmonize the effects of motor stability toward environmental symmetry, this study investigates the following elaboration.

### Symmetry breaking in bimanual coordination dynamics

The potential [\( {\text{V}}\left( \upphi \right) \)] extends the described assumption in terms of the difference between the uncoupled frequencies of bimanual rhythmic components [\( {{\Delta }}\omega = \left( {\omega_{L} - \omega_{R} } \right) \)]. Where \( \omega \) is the preferred movement frequency of the left (\( \omega_{L} \)), right (\( \omega_{R} \)) individual. If the relative phase between \( \omega_{L} \) and \( \omega_{R} \) were equal (\( {{\Delta }}\omega \) = 0), this pattern would be assumed to be a perfectly identical symmetry. However, the preferred movement frequencies of the individual oscillators in in-phase are large (i.e., function: b/a = 0.5, detuning = − 0.5, or detuning = − 1.5), the expected stability of the rhythmical limb oscillation dynamics become greater than equal (see Fig. 13).

Such phenomena of the symmetry breaking must be another fundamental feature of the coordinative system (Amazeen et al. 1998). From this dynamic, a different noise of the underlying subsystems (neural, muscular, and vascular) can be estimated around an equilibrium point, and this might conceptualize the model when it comes to making operational definitions of each category in which the model has to consider the variability of the relative phase frequencies between two limbs:

The estimation of two oscillators’ relative phase (\( \dot{\upphi } \)) is captured by the parameter (\( {{\Delta }}\omega \)) of the preferred movement frequency of the individual segment [\( \alpha \cos \left( \upphi \right) - b \cos \left( {2\upphi } \right) \)] with the noise (\( \sqrt {{\varrho }\xi_{t} } \)). Given the equation of the preceding model (grouped as the kinematics of motor stability according to the coordination task of synchronization), such a term has been used to capture purely functional dynamics regarding the equilibria and is confirmed usually as in the time and temporal difference between an oscillating limb.

Researchers (Treffner and Turvey 1995), conducting experiments in handedness, advanced the elementary coordination dynamics. They added two add (sine) terms for the coefficients, whose signs and magnitudes determine the degree and direction of asymmetry, as follows;

Here, \( \dot{\upphi } \) indicates a coordination change. \( {{\Delta }}\omega \) refers to a symmetry breaking through frequency competition between two limbs. \( \left[ {\alpha \sin \left( \upphi \right) + 2b \,{\text{sin}}\,\left( {2\upphi } \right)} \right] \) denotes a symmetric coupling defined by relative phase of 0 and π attractors (this form of the term could be derived as the negative gradient potential V with respect to ϕ); and the \( \left[ {c \sin \left( \upphi \right) + 2d \sin \left( {2\upphi } \right)} \right] \) terms means added asymmetric coupling attractors with the stochastic noise \( \sqrt {{\varrho }\xi_{t} } \). This extended equation refers to the fact that the emergent elementary dynamics between limbs or limb segments was governed by a slightly asymmetric potential of the \( \left[ {c \sin \left( \upphi \right) + 2d\, {\text{sin}}\,\left( {2\upphi } \right)} \right] \). That suggests extended collective dynamics of the inter-segmental rhythmic coordination of the periodic components.

### Thermoregulatory symmetry breaking of the elementary coordination

Inspired by the complementary symmetric and asymmetric influences, the described model was applied to investigate the difference between the coupled or uncoupled frequencies of the temperature-rhythmic components between the core body and circadian cycles.

where *d* is the preferred rhythmic frequency of one (the homeostasis cycle) and another (*c* = circadian cycle) individual. Whereas b/a determines the relative strengths of the fundamental in-phase equilibria, small values of \( c \) and \( d \) break the symmetry of the elementary coordination dynamics while leaving their essential coupling characteristics.

In this proposed assumption, the coefficient of the *d* should be more important, producing the empirically observed perturbation in the equilibrium phase state, and then the *c* should be set to zero without loss of generality, given that we cannot manipulate the environmental circadian cycle. As one can see, if the coupling between *d* and *c* is strong (\( \left| {c \ and \ d} \right| \approx 0 \)), this pattern would potentially be expected to be in perfectly corresponding symmetry with the environmental requirement. However, the preferred rhythmic coupling of individual oscillators in an in-phase condition becomes a difference (\( \left| {c\;and\;d} \right| > 0 \)), and thus the expected stability or variability of the rhythmical-component oscillation dynamics will become greater than equal. Given the preceding assumption (grouped as the kinematics of motor stability according to the coordination task of synchronization), the equation was extended to a novel task in which there are different sources of symmetry breaking through thermal variables, as information has not yet been made available about the effects of bimanual dynamics in instruction on circadian temperatures.

In this equation, in the bimanual 1:1 rhythmic coordination performed at different coupled frequencies, the symmetric coupling coefficients will be not the same. There will be an increase in detuning (\( {{\Delta }}\omega \)) and a decrease in the relative strengths of the attractors at 0 and π. However, when it comes to our limiting case of \( {{\Delta }}\omega \) = 0 on the approximately identical symmetry temperature parameters (core body and circadian cycle), what should we expect? The final estimation between the relative phases of two oscillators (\( \dot{\upphi } \)) will be captured mainly by the parameter of the asymmetric thermoregulatory coupling \( \left[ {c \sin \left( {\upphi^{{^{ \circ } {\text{C}}}} } \right) + 2d\, {\text{sin}}\,\left( {2\upphi^{{^{ \circ } {\text{C}}}} } \right)} \right] \) with noise (\( \sqrt {{\varrho }\xi_{t} } \)). From this dynamic, the different noise types of the underlying subsystems (neural, muscular, and vascular) around an equilibrium point were able to be estimated, suggesting that such phenomena related to symmetry breaking may be yet another remarkable feature of the coordinative system.

In sum, this experiment was required to have a condition of in-phase (\( \upphi = 0 \)) oscillated simultaneously at the 1:1 frequency locking (the in-phase was suggested for the main variable based on the pilot test; see Additional file 1: 2.4 and 2.5 for more detail). The same goal using the functional symmetry dynamics of different effectors will be influenced by the asymmetric thermal regulation symmetry breaking through both circadian temperature cycles. Namely, the effect of one of the contralateral homologous relative limbs phase might be not identical to the impact of the others. The expected stability pattern, from intuition given a different motor, appears to allow the biological symmetry dynamic to be understood in the ecological context. This attunement to the circadian temperature approach implies an emergent property of the system.

## Availability of data and materials

All data and materials are our own. The materials and data used to support findings of this study are included within the additional file.

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## Acknowledgements

The author sincerely thanks the experimental participants at University of Connecticut and Seoul National University for their patience. All of them provided written informed consent to the study approved by the local ethics committee (SNUIRB No. 1509/002-002) and conformed to the ethical standards of the 1964 Declaration of Helsinki (report ID 20481572). The authors would also especially wish to thank Seonjin Kim at Laboratory of Motor Behavior (Seoul, Korea), Hyeongsaeng Park at Cognitive Science Program (Seoul, Korea), Claudia Carello at Center for the Ecological Study of Perception and Action (Connecticut, USA), Ulf Dieckmann at International Institute for Applied Systems Analysis (Laxenburg, Austria) for their fruitful discussion and the valuable support during the development of this article.

## Funding

This research was supported by an NSF Grant BCS-1344725 (INSPIRE Track 1), and the National Research Foundation of Korea (2016K2A9A1A02952017).

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CP designed the model, did the analysis and tested it, and wrote the paper. The author read and approved the final manuscript.

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Correspondence to Chulwook Park.

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### Cite this article

Park, C. Evolutionary understanding of the conditions leading to estimation of behavioral properties through system dynamics.
*Complex Adapt Syst Model* **8, **2 (2020). https://doi.org/10.1186/s40294-019-0066-x

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### Keywords

- System approach
- Agent-based model
- Elementary coordination
- Circadian cycles
- Collective structure