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Personality influences limbic-cortical interactions during sad mood induction
Michelle L Keightley1, David A Seminowicz, R Michael Bagby
1Rotman Research Institute, Baycrest Centre for Geriatric Care, Toronto, Ontario, Canada.
Neuroimage
|December 20, 2003
Summary
This study reveals how personality traits influence brain activity during emotional stress. Specific limbic-cortical network differences were found between individuals with negative and positive affective styles, linking personality to depression vulnerability.
Area of Science:
- Neuroscience
- Psychology
- Psychiatry
Background:
- Limbic-cortical network activation is crucial for emotional regulation.
- Personality traits, particularly negative and positive emotionality, are linked to mood variations and depression.
- Previous research suggests altered ventral cingulate (Cg25) activity in negative mood states.
Purpose of the Study:
- To investigate limbic-cortical network activation during transient emotional stress.
- To examine how personality styles, specifically combinations of negative and positive emotional traits, modulate this activation.
- To identify neural correlates of affective styles and their potential link to depression vulnerability.
Main Methods:
- Positron emission tomography (PET) was used to measure regional cerebral blood flow (rCBF).
- A sad mood challenge was administered to healthy subjects.
- Subjects were selected based on NEO Personality Inventory-Revised scores for specific traits (Neuroticism-Depression, Extraversion-Positive Emotions).
- Partial least squares (PLS) analysis was employed to identify divergent brain networks.
Main Results:
- A ventral cingulate (Cg25)-centered limbic-cortical network showed differential activation.
- This Cg25-mediated network distinguished between temperamentally negative (NAS) and temperamentally positive (PAS) subjects.
- The findings provide a neural basis for how specific trait combinations relate to mood reactivity.
Conclusions:
- Personality styles significantly influence limbic-cortical responses to emotional stress.
- A divergent Cg25-mediated network underlies differences between negative and positive affective styles.
- These findings suggest a potential neural pathway linking specific personality trait combinations to an increased vulnerability to depression.