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Affective personality differences in neural processing efficiency confirmed using fMRI.

Jeremy R Gray1, Gregory C Burgess, Alexandre Schaefer

  • 1Psychology Department, Yale University, Box 208205, New Haven, CT 06520, USA. jeremy.gray@yale.edu

Cognitive, Affective & Behavioral Neuroscience
|September 27, 2005
PubMed
Summary
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Individuals with higher behavioral approach sensitivity (BAS) show less brain activity during demanding tasks, suggesting greater neural efficiency. Personality traits, not just intelligence, influence cognitive brain function.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Individual Differences

Background:

  • Individual differences in personality are thought to relate to cognitive abilities.
  • Neural processing efficiency may underlie the link between personality and cognition.
  • Cognitive control and working memory are crucial for complex tasks.

Purpose of the Study:

  • To investigate the relationship between personality traits and neural processing efficiency.
  • To examine brain activity during a working memory task in relation to personality.
  • To determine if personality influences cognitive control network activity.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants completed personality scales (BIS/BAS) and a fluid intelligence test.

Related Experiment Videos

  • A three-back working memory task with a mixed blocked/event-related fMRI design was employed.

    • Main Results:

    • Higher behavioral approach sensitivity (BAS) correlated with reduced event-related fMRI activity in the dorsal anterior cingulate, lateral prefrontal cortex, and parietal regions.
    • These findings were independent of behavioral performance and fluid intelligence.
    • Personality dimensions were distinct from intelligence but modulated overlapping brain regions.

    Conclusions:

    • Greater behavioral approach sensitivity (BAS) is associated with enhanced neural efficiency in cognitive control networks.
    • Affective personality dimensions and intelligence are independent but may interact by influencing shared neural substrates.
    • This study highlights the specific neural underpinnings of personality-trait-related cognitive function.