Performance is correlated with sparsity and modularity.

<p>Black dots represent the highest-performing network from each of the 100 experiments from both the PA and P&CC treatments. Both the sparsity (<i>p</i> = 1.08 × 10⁻¹⁶) and modularity (<i>p</i> = 1.19 × 10⁻⁵) of networks significantly correlates with their performance. Performance was measured in 80 randomly generated environments (<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004128#sec016" target="_blank">Methods</a>). Significance was calculated by a <i>t</i>-test of the hypothesis that the correlation is zero. Notice that many of the lowest-performing networks are close to the maximum of 150 connections.