Abstract
There is ample evidence that speed of information processing is related to mental abilities, as more intelligent individuals have shorter reaction times in elementary cognitive tasks (ECTs). The aim of this study is to identify neuro-cognitive processes that might be responsible for this association, and to investigate their factor structure and its relation to general intelligence. 40 participants drawn from a community sample completed a choice reaction time task and two binary decision tasks while an EEG was recorded. A diffusion model approach was applied to the RT data, which decomposes different cognitive processes involved in speeded binary decisions. Behavioral and electrophysiological results indicate that ECT conditions vary in different neuro-cognitive components of information processing. Additionally, factor analysis shows that all mental speed variables have substantial loadings on a second-order general factor marked by intelligence. These results suggest that there is a common neuro-cognitive speed factor associated with general intelligence.
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