Conscientiousness
Intelligence

Conscientiousness has distinct sub-components, including two major branches (i.e., orderliness and industriousness). The largest set of meta-analyses found that these branches of conscientiousness have disparate connections with cognitive abilities. Orderliness has negative correlations with some cognitive abilities (e.g., fluid reasoning abilities, math knowledge, lexical knowledge, and science knowledge) whereas industriousness has strikingly positive correlations with multiple abilities (e.g., general mental ability, memory, processing speed, and knowledge).

Some previous studies in selected samples (e.g., job candidates, university students) have found negative correlations between conscientiousness and intelligence. One potential explanation is that these negative correlations may be artificially created by the selection of the sample. For example, with students who are low on one trait and high on the other (negative relationship) using the strong one to compensate and pass the selection, while students who are low on both (positive relationship) are removed by the selection.
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