When compared at the same level of fitness, all causal measures evolved to significantly higher values, except for the number of MC concepts, which still almost reached significance p<0.05 (U 57 = 77.5/71.0/136/141/112, Z = −3.143/−3.247/−1.999/−1.886/−2.538, p = 0.002/0.001/0.046/0.059/0.011 respectively for #concepts/ Σφ Max /#MC elements/#MC concepts/ Φ Max ).
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Evolution of integrated causal structures in animats exposed to environments of increasing complexity.
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