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J Neuropsychiatry Clin Neurosci. 1995 Spring;7(2):169-75.

Evoked potential evidence for right brain activity during the recall of traumatic memories.

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  • 1Department of Psychiatry, Harvard Medical School, Belmont, MA, USA.


Auditory probe evoked potential attenuation was measured as an index of hemispheric activity in 10 subjects with a history of childhood trauma and 10 matched subjects without such history while they recalled a neutral memory and then a traumatic memory. There were prominent group differences in degree of cerebral laterality between memory tasks (P = 0.02). The trauma group had a significant left dominant asymmetry during the neutral memory (P = 0.02), which markedly shifted to the right during the unpleasant memory (P = 0.007 for degree of shift). Normal control subjects did not display a significant asymmetry during either task, nor did they show a significant shift between tasks.

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