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Volume 17, Number 7, Issue of April 1, 1997 pp. 2615-2625
Copyright ©1997 Society for NeuroscienceTemporal Integration and Duration Tuning in the Dorsal Zone of Cat Auditory Cortex
Received Oct. 15, 1996; revised Jan. 2, 1997; accepted Jan. 22, 1997.
Jufang He1, 2, 3, Tsutomu Hashikawa1, Hisayuki Ojima4, and Yohsuke Kinouchi2 1 Laboratory for Brain Structure and Function, Frontier Research Program, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01, Japan, 2 Department of Electrical and Electronic Engineering, The University of Tokushima, Tokushima 770, Japan, 3 Advanced Research Laboratory, Hitachi, Hatoyama, Saitama 350-03, Japan, and 4 First Department of Anatomy, Toho University School of Medicine, Tokyo 143, Japan
The present study examined auditory cortical neurons, the responses of which depended on the duration of noise bursts. We recorded from 150 neurons with response latencies exceeding 30 msec and from 28 neurons with OFF responses to auditory stimuli in the dorsal zone of cat auditory cortex. Of 150 long-latency neurons, 132 displayed some form of duration selectivity. Seventy-eight were classified as selective for long durations. Among the long-duration-selective neurons, 30 responded only to noise burst stimuli with durations longer than a minimal threshold and were classified further as duration threshold neurons. Of 132 duration-selective neurons, 41 responded selectively to noise bursts of short duration; 13 showed maximal responses to noise bursts of a particular duration and could be regarded as duration-tuned neurons. OFF-response neurons included ones that were long-duration-selective, duration-tuned, and nonduration-selective.
Duration tuning has been described previously only at the midbrain level in amphibians and bats. The present finding of sensitivity to sound duration in at least one region of cat auditory cortex indicates that this form of neural tuning may be important for hearing in all vertebrates, and for processing of sound at multiple levels in the auditory pathway. The duration tuning in the cat auditory cortex was much broader, and the best duration was distributed over a wider range than in the bat inferior colliculus. We suggest that the duration selectivity of the long-latency neurons results from integration along the time domain of a stimulus during the latent period.
Key words: dorsal auditory cortex; long-latency response; duration-selective neuron; temporal summation; temporal suppression; duration threshold neuron; OFF response; cat
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