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FACTORS CONTROLLING BRAIN POTENTIALS IN THE CAT

FACTORS CONTROLLING BRAIN POTENTIALS IN THE CAT * From the Department (Received for of Physiobgy, publiion University January of Chicago 3, 1939) IT IS NOW ESTABLISHED that central neurones may exhibit spontaneous rhythmic . Even when synaptic transmission is blocked these spontaneous waves contue may crease amplitude (Libet Gerard, 1938). We have studied the some of the physical chemical factors that fluence this “trsic” periodicity, as well as the effect on it of external stimulation under varyg physico-chemical conditions; certa neural factors affectg the rhythm have also been vestigated. METHOD The left hemisphere of s was widely exposed under light nembutal anaesthesia (35 mg. per kg. traperitoneally), the Horsley-Clarke strument attached. An hour later a concentric needle was placed the desired position along the optic pathways amplified recorded with a crystograph or hode ray oscillograph. Retal stimulation was caused usually by a flash-light directed to the contralateral eye, or sometimes by a sgle flash of a condenser discharge through a 2.5 V. bulb. A polarizg current (less than 1.0 mA.) was passed through tissue between an different silver plate (2 to 3 cm. surface) applied to the surface of the opposite cerebral cortex, a silver wire (2 to 3 mm. unsulated tip) placed 3 to http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

FACTORS CONTROLLING BRAIN POTENTIALS IN THE CAT

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Publisher
The American Physiological Society
Copyright
Copyright © 1939 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
Publisher site
See Article on Publisher Site

Abstract

* From the Department (Received for of Physiobgy, publiion University January of Chicago 3, 1939) IT IS NOW ESTABLISHED that central neurones may exhibit spontaneous rhythmic . Even when synaptic transmission is blocked these spontaneous waves contue may crease amplitude (Libet Gerard, 1938). We have studied the some of the physical chemical factors that fluence this “trsic” periodicity, as well as the effect on it of external stimulation under varyg physico-chemical conditions; certa neural factors affectg the rhythm have also been vestigated. METHOD The left hemisphere of s was widely exposed under light nembutal anaesthesia (35 mg. per kg. traperitoneally), the Horsley-Clarke strument attached. An hour later a concentric needle was placed the desired position along the optic pathways amplified recorded with a crystograph or hode ray oscillograph. Retal stimulation was caused usually by a flash-light directed to the contralateral eye, or sometimes by a sgle flash of a condenser discharge through a 2.5 V. bulb. A polarizg current (less than 1.0 mA.) was passed through tissue between an different silver plate (2 to 3 cm. surface) applied to the surface of the opposite cerebral cortex, a silver wire (2 to 3 mm. unsulated tip) placed 3 to

Journal

Journal of NeurophysiologyThe American Physiological Society

Published: Mar 1, 1939

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