Reactivity Cycle of Somatosensory Cortex in Humans with and without Psychiatric Disorder

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Science  01 Dec 1961:
Vol. 134, Issue 3492, pp. 1757-1759
DOI: 10.1126/science.134.3492.1757


With a photographic averager to extract evoked cortical responses, reactivity cycles of primary potentials were determined over 200 milliseconds in 105 subjects. The typical cycle was biphasic, with peaks before 20 and after 100 msec. Subjects who were not psychiatric patients showed full recovery of responsiveness during the initial peak phase, whereas most of the psychiatric patients did not.