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Computer audiometry in cats.

Evoked responses to pure-tone pulses in normal cats under pentobarbital anesthesia were averaged by an electronic computer. One recording point which represents most effectively the auditory responses of a cat was determined on the middle ectosylvian gyrus. The typical averaged response consists of a diphasic wave (P 1 N 1 -complex). Mean thresholds and standard deviations of averaged cortical responses in 122 normal cats (128 ears) were determined at each frequency from 500 hertz to 8,000 Hz. Some examples of the audiograms of experimentally deafened cats obtained by this computer audiometry were shown. This averaged cortical response technique might serve as the most practical and useful method of measuring the auditory responses of animals.