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Randomness of resting-state brain oscillations encodes Gray's personality trait.

Abstract：

:Randomness of functional Magnetic Resonance Imaging (fMRI) resting-state time-series has recently been used as a biomarker for numerous disorders including Alzheimer's and Parkinson's disease as well as autism. To date, however, it remains unknown whether and to what degree personality traits are associated with the randomness of resting-state temporal dynamics. To investigate this question, we estimated the Hurst exponent - a measure of the randomness of a time-series - during resting-state fMRI in brain areas previously associated with trait Impulsivity as defined in Gray's Reinforcement Sensitivity Theory of Personality in 15 healthy individuals. The Hurst exponent in the ventral striatum as well as in the orbitofrontal cortex (OFC) was significantly associated with the measure of Gray's trait Impulsivity. Specifically, more random resting-state neural dynamics corresponded to higher Impulsivity scores both in the ventral striatum (r(15)=-.71; p=.003) and the OFC (r(15)=-.81; p<.001). In summary, we provide evidence for an association between individual differences in Gray's Impulsivity and randomness in key areas of the reward system which have previously been associated with this personality trait. Based on evidence from fMRI and electroencephalographical studies, we suggest that this association might arise from resting-state fluctuations constraining task-related neural responsiveness. Thereby, we outline a potential mechanism linking randomness of resting-state dynamics and personality.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Hahn T,Dresler T,Ehlis AC,Pyka M,Dieler AC,Saathoff C,Jakob PM,Lesch KP,Fallgatter AJ

doi

10.1016/j.neuroimage.2011.08.042

subject

Has Abstract

pub_date

2012-01-16 00:00:00

pages

1842-5

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(11)00941-4

journal_volume

59

pub_type

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