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Physiological and psychological individual differences influence resting brain function measured by ASL perfusion.

M Kano¹, S J Coen, A D Farmer

¹Centre for Digestive Diseases, Wingate Institute of Neurogastroenterology, Blizard Institute of Cell and Molecular Science, Barts and the London School of Medicine and Dentistry, Queen Mary College, University of London, London, UK.

Brain Structure & Function

|June 18, 2013

Summary

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Individual differences in autonomic tone and personality traits like neuroticism and extraversion significantly impact resting brain activity. Lower cardiac vagal tone correlates with reduced perfusion in the ACC and cerebellum.

Area of Science:

Neuroscience
Psychophysiology
Brain Imaging

Background:

Individual differences in physiological and psychological states are not fully understood regarding their effects on the resting brain.
Understanding these variations is crucial for interpreting neurobiological studies of individual differences.

Purpose of the Study:

To investigate how individual differences in basal autonomic tone and personality dimensions influence resting brain activity.
To explore the relationship between cardiac vagal tone (CVT), neuroticism, extraversion, and cerebral perfusion.

Main Methods:

Acquired whole-brain resting cerebral perfusion MRI using arterial spin labeling in 32 healthy subjects.
Assessed personality traits (neuroticism, extraversion) using the Eysenck Personality Questionnaire-Revised.

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Measured baseline cardiac vagal tone (CVT) and analyzed associations with perfusion data using multiple regression.

Main Results:

Lower CVT was associated with greater resting brain perfusion in the dorsal anterior cingulate cortex (ACC) and cerebellum.
Extraversion positively correlated with resting brain perfusion in the right caudate, brain stem, and cingulate gyrus.
Neuroticism negatively correlated with regional cerebral perfusion in the left amygdala, insula, ACC, and orbitofrontal cortex.

Conclusions:

Individual autonomic tone and psychological variability demonstrably influence resting brain activity.
Resting brain activity in regions like the ACC, amygdala, and caudate is linked to autonomic arousal and personality traits.
The resting brain state is a significant factor to consider when interpreting the neurobiology of individual differences.