WAVE ACTIVITY IN THE SUPERIOR OLIVARY COMPLEX OF THE CAT

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Abstract
Wave activity in response to noise and tone stimuli was recorded during depth penetrations with microelectrodes into the superior olivary complex of the anesthetized cat. Two types of waveforms were identified: a slow potential in response to noise or tone bursts and a "following" response. The "following" response was of the same fundamental frequency as the tonal stimulus and "followed" in frequency from about 100 to 2,800 cycles per second with a maximum amplitude at around 800 cycles per second. Measurements of the amplitude of these 2 types of responses demonstrated peaks in and near the accessory nucleus. Major changes in phase and polarity occurred when the electrode penetrated this structure. Contralaterally evoked responses were in general of larger amplitude than those produced by ipsilateral stimulation. Stimulation of either ear evokes in the trapezoid body a traveling wave, moving at about 16 to 22 meters/sec.

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