title: Cerebral blood flow and personality: a positron emission tomography study.
abstract: OBJECTIVE
  This study sought to describe brain regions associated with the personality dimension of introversion/extraversion.
  
  
  METHODS
  Measures of cerebral blood flow (CBF) were obtained from 18 healthy subjects by means of [150]H20 positron emission tomography. Correlations of regional CBF with introversion/extraversion were calculated, and a three-dimensional map of those correlations was generated.
  
  
  RESULTS
  Overall, introversion was associated with increased blood flow in the frontal lobes and in the anterior thalamus. Regions in the anterior cingulate gyrus, the temporal lobes, and the posterior thalamus were found to be correlated with extraversion.
  
  
  CONCLUSIONS
  The findings of the study lend support to the notion that introversion is associated with increased activity in frontal lobe regions. Moreover, the study suggests that individual differences in introversion and extraversion are related to differences in a fronto-striato-thalamic circuit.
authors.affiliation: Mental Health Clinical Research Center and the Department of Psychology, University of Iowa Hospitals and Clinics, Iowa City, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Johnson
authors.forename: J S
authors.initials: JS
authors.lastname: Wiebe
authors.forename: S M
authors.initials: SM
authors.lastname: Gold
authors.forename: N C
authors.initials: NC
authors.lastname: Andreasen
authors.forename: R D
authors.initials: RD
authors.lastname: Hichwa
authors.forename: G L
authors.initials: GL
authors.lastname: Watkins
authors.forename: L L
authors.initials: LL
authors.lastname: Boles Ponto
mesh_terms: D000328:Adult; D001921:Brain / Q000098:blood supply* / Q000000981:diagnostic imaging / Q000502:physiology; D005120:Extraversion, Psychological; D005260:Female; D005625:Frontal Lobe / Q000098:blood supply / Q000000981:diagnostic imaging; D007839:Functional Laterality / Q000502:physiology; D006179:Gyrus Cinguli / Q000098:blood supply / Q000502:physiology; D006801:Humans; D007439:Introversion, Psychological; D008297:Male; D008568:Memory / Q000502:physiology; D008875:Middle Aged; D010104:Oxygen Radioisotopes; D010551:Personality / Q000145:classification*; D012039:Regional Blood Flow; D013702:Temporal Lobe / Q000098:blood supply / Q000502:physiology; D013788:Thalamus / Q000098:blood supply / Q000502:physiology; D013850:Thinking / Q000502:physiology; D014055:Tomography, Emission-Computed; D014867:Water