ELECTRICAL IDENTIFICATION OF CERTAIN NUCLEI AND FIBER TRACTS IN BRAIN OF CAT

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Abstract
A method for the identification of brain nuclei or fiber tracts by measurement of their spontaneous electrical activities in terms of frequency and amplitude components was used to study the nucleus entopeduncularis, the ansa lenticularis, and the optic tract. In each structure the amplitude-frequency spectrum rose, statistically, to a maximum at about 3 cps and declined rapidly above 10 cps, falling substantially to zero by about 25 cps. The amplitude at each frequency was significantly greater in the ansa lenticularis than in the nucleus entopeduncularis, and significantly greater in the optic tract than in the ansa lenticularis. The root-mean-square amplitudes of spontaneous activity in the frequency bands from 1-25 cps and from 2-7 cps were measured in each of these structures. In over 75% of the cases studied, the sharp increase in amplitude of the spontaneous activity seen when the electrode passed from the ansa lenticularis into the optic tract was great enough to be considered a sufficient indication of the position of the electrode.

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