D.C. POTENTIAL CHANGES FROM AUDITORY CORTEX OF CAT

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Abstract
A direct coupled amplifier was used to record potential changes from the dura overlying the auditory cortex of cats. Stimulation by continuous sounds of 1-10 sec. duration evoked surface negative shifts (referred to frontal periosteum) of about 100 [mu]v. There was much variation in the temporal characteristics of the shifts. The onset was usually abrupt but frequently more gradual. The shift often persisted until the sound ended, but not infrequently it weakened or disappeared somewhat earlier. Rarely the shift persisted for some seconds after the end of the sound. Single clicks did not produce a shift but at 5-19 clicks/sec. the gradual development of a shift was seen. The shifts were ordinarily accompanied by a regularization and acceleration of the spontaneous cortical activity. The shifts could be recorded only when the cortex was warm and moist and when the cat was almost awake. The proper conditions were described in detail and a method by which the shifts can be reliably obtained was described.

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