β Scribed by Stewart A. Shankman; Steven M. Silverstein; Leanne M. Williams; Patrick J. Hopkinson; Andrew H. Kemp; Kim L. Felmingham; Richard A. Bryant; Alexander McFarlane; C. Richard Clark
No coin nor oath required. For personal study only.
The valenceβarousal (W. Heller, 1993) and approachβwithdrawal (R. J. Davidson, 1998a) models hypothesize that particular patterns of hemispheric brain activity are associated with specific motivational tendencies and psychopathologies. We tested several of these predictions in two groupsβa posttraumatic stress disorder (PTSD) and a βsupercontrolβ group, selected to be maximally different from those with PTSD. Contrary to almost all hypotheses, individuals with PTSD did not differ from controls on resting electroencephalogram (EEG) asymmetry. Particular aspects of PTSD were also not related to EEG hemisphere differences. Our null findings are consistent with the few studies that have examined resting EEG asymmetries in PTSD and suggest that PTSD may be associated with different processes than psychopathologies previously examined in studies of hemispheric brain activity (e.g., major depressive disorder, panic disorder).
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