Short‐latency auditory responses obtained by cross correlation

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Abstract
Short‐latency auditory responses were derived by cross correlation of pseudorandom white noise with averaged scalp potentials in guinea pigs. The cross‐correlation functions were characterized by distinct cochlear microphonic and neural components, as distinguished by susceptibility to hypothermia and masking noise. This technique detects only linear, frequency‐following responses of the auditory system, and demonstrated neural frequency following up to 3–4 kHz; thresholds were about 30–40 dB spectrum level. While conventional auditory brain stem responses reflect onset neural activity and are most responsive to high‐frequency stimuli, cross‐correlation responses reflect frequency‐following activity, primarily to low frequencies, and thus may represent a complementary method of electrophysiologic assessment of the auditory system. Data are very rapidly acquired, and estimation of responses of limited areas of the cochlea may be possible by off‐line digital filtering of cross‐correlation functions obtained with broadband noise stimuli.

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