Open Access

Erratum to: A moderate role for cognitive models in agent-based modeling of cultural change

Complex Adaptive Systems Modeling20142:1

Received: 3 December 2013

Accepted: 3 December 2013

Published: 6 January 2014

The original article was published in Complex Adaptive Systems Modeling 2013 1:16


After publication of (Abrams 2013), I discovered errors in two formulas in the settle-nets paragraphs of the POPCO main loop section in Methods (page 13 in the PDF file). I correct these errors here. In the definition of the weighted sum n i of input activations a j from nodes j to node i across links with weights w ij , the direction of the inequality was reversed. The definition of n i should read:
n i = j w ij max ( 0 , a j ) for w ij < 0 .
There were also errors in the definition of s i , the weighted sum of a node’s current activation a i and its summed inputs p i and n i across positively and negatively weighted links, respectively. The definition of s i should read as follows:
s i = ( 1 . 1 ) a i + ( . 99 a i ) p i + ( a i ( . 99 ) ) n i

I regret these errors and hope that they do not cause confusion. Full source code for the version of POPCO used in Abrams (2013) can be found at


Authors’ Affiliations

Department of Philosophy, University of Alabama at Birmingham, USA


  1. Abrams M: A moderate role for cognitive models in agent-based modeling of cultural change. Complex Adaptive Syst Model 2013, 1(16):1–33.MathSciNetGoogle Scholar


© Abrams; licensee Springer. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.