Electroencephalographic phase reversal observed in chickens.

Abstract

1. By using the linked method, the electric field of the chicken brain was observed under restrained conditions to determine the presence of a dipole.2. One of the two foci of phase reversal observed was between Le. 1-2 and Le. 3-4, or between Le. 1'-2' and Le. 3'-4', and the other was between Le. 8-9 and Le. 9-10, or between Le. 6'-7' and Le. 7'-8', both in unanesthetized and anesthetized chickens.3. According to the dipole hypothesis concerning the origin of the electro-encephalogram, one dipole was present under these foci of phase reversal, or at electrode position P.2 or P.2:9 or 7.5mm frontal to the bregma and 3mmlateral to the median line, and the other one at electrode position P. 9:3mm frontal to the bregma and 6mm lateral to the median line.4.In anesthetized chickens, however, a dipole seemed to be present under electrode position P.7:7.5mm frontal to the bregma and 6mm lateral to the median line.The authors are deeply grateful to Professor K. TAKAGI, Department of Physiology, Faculty of Medicine, Nagoya University, for his kind advice. Ac-knowledgment is also made to Professor S. SAKASEGAWA, of Nippon Veterinary and Zootechnical College, who has reviewed the expression of this manuscript.