Negative results are needed to show the specific value of a cultural explanation for g: A commentary on Burkart et al.

The authors suggest that social learning can explain the cognitive positive manifold for social animals including humans. We caution that simpler explanations of positive trait intercorrelations exist, such as genetic load. To test the suggested explanation's specifity, we also need to examine non-social species and traits such as health that are distal to cognitive abilities.