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Cerebral Cortical Reactivity in Psychotic Depressions
CHARLES SHAGASS, M.D.;
MARVIN SCHWARTZ, Ph.D.
Arch Gen Psychiatry. 1962;6(3):235-242.
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Recent technical developments have made it possible to measure cortical responses evoked by sensory stimulation in recordings taken from the human scalp. These potentials are not detectable in the usual electroencephalogram (EEG) because they are so small in relation to the "spontaneous" brain rhythms. They may, however, be recorded by averaging methods.1 Using such methods in our laboratory, we have been studying evoked potentials of the somatosensory cortex with the aim of determining whether psychiatric illness is associated with measurable abnormalities in cortical reactivity.2
In our work we have been particularly interested in measuring the cycle of cortical reactivity, which can be derived by com-paring the responses to paired stimuli separated by varying time intervals. The procedure for determining the reactivity cycle is similar to the classical neurophysiological method for measuring the excitability cycle of nerve, except that suprathreshold
. . . [Full Text PDF of this Article]
Author Affiliations
IOWA CITY
Professor, Department of Psychiatry, College of Medicine and Psychopathic Hospital, State University of Iowa (Dr. Shagass); Research Assistant Professor (Dr. Schwartz).
Footnotes
Submitted for publication Aug. 15, 1961.
Supported (in part) by a research grant, MY2635, from the National Institute of Mental Health, U.S. Public Health Service.
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