Localized cooling of the medullary floor of the 4th ventricle in front of the obex produces EEG and behavioral arousal in the "encephale isole" cat, if the experiment is carried out during spontaneous sleep or following injection of small doses of Nembutal. Cooling this area at the level of the upper pons has the opposite effect in the encephale isole preparation and in the midpontine pretregeminal cat. In this preparation the tracking movements of the eyes are also reversibly blocked by pontine cooling. The corneal reflex is abolished during pontine cooling whereas it persists during bulbar cooling, which increases heart rate. These effects are attributed to reversible functional inactivation of deactivating centers lying in the medulla. (34 ref.) ((c) 1997 APA/PsycINFO, all rights reserved)
EEG and behavioral effects elicited by cooling of medulla and pons
BERLUCCHI, Giovanni;
1964-01-01
Abstract
Localized cooling of the medullary floor of the 4th ventricle in front of the obex produces EEG and behavioral arousal in the "encephale isole" cat, if the experiment is carried out during spontaneous sleep or following injection of small doses of Nembutal. Cooling this area at the level of the upper pons has the opposite effect in the encephale isole preparation and in the midpontine pretregeminal cat. In this preparation the tracking movements of the eyes are also reversibly blocked by pontine cooling. The corneal reflex is abolished during pontine cooling whereas it persists during bulbar cooling, which increases heart rate. These effects are attributed to reversible functional inactivation of deactivating centers lying in the medulla. (34 ref.) ((c) 1997 APA/PsycINFO, all rights reserved)
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