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Document Type

Research

Abstract

Deep, chronic electrodes were implanted in the anterior and posterior hypothalamus of seven thirteen-lined ground squirrels. The electrical brain activity and heart rate were recorded as the animal's body temperature was decreased by cooling the animal in a refrigerator. Above 23°C body temperature, amplitude varied, but remained near normal. From 23° to 21°C the amplitude dropped sharply, decreasing by almost 50 per cent. Below 21 °C, the amplitude decreased more gradually. Detectable but not easily measurable activity was recorded at 11 °C. Frequency showed an initial rise, then decreased between 22° and 26°C, then increased again through 16°C. Heart rate declined slowly and the heart continued to beat even at 15°C where most recordings were terminated.

Publication Date

1964

Journal Title

Proceedings of the Iowa Academy of Science

Volume

71

Issue

1

First Page

467

Last Page

473

Copyright

© Copyright 1964 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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