Accession Number : AD0618804

Title :   EEG CORRELATES OF TONIC IMMOBILITY IN THE OPOSSUM (DIDELPHIS VIRGINIANA),

Corporate Author : TEXAS UNIV GALVESTON MEDICAL BRANCH

Personal Author(s) : Barratt,E. S.

Report Date : 30 NOV 1964

Pagination or Media Count : 3

Abstract : Five different behavioral states in the opossum were related to five different EEG patterns. The EEG activity during tonic immobility was characterized by low voltage fast activity. Tonic immobility was always preceded by long bursts of both cortical and amygdaloid alpha range EEG activity which characterized an 'awaking-alert-fixating' state of behavior. However, a similar pattern was also seen in 3 opossums in which tonic immobility could not be obtained. The results suggest that alpha range activity may be a necessary but not sufficient condition for the onset of tonic immobility in this animal. (Author)

Descriptors :   (*MAMMALS, BEHAVIOR), (*ELECTROENCEPHALOGRAPHY, BEHAVIOR), NERVOUS SYSTEM, PHYSIOLOGY, MUSCLES, SLEEP, ELECTROCARDIOGRAPHY

Distribution Statement : APPROVED FOR PUBLIC RELEASE