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The Journal of Neurophysiology Vol. 84 No. 1 July 2000, pp. 435-450
Copyright ©2000 by the American Physiological Society
Department of Physiology and Waisman Center, University of Wisconsin, Madison, Wisconsin 53705
Reale, Richard A. and
John F. Brugge.
Directional Sensitivity of Neurons in the Primary Auditory (AI)
Cortex of the Cat to Successive Sounds Ordered in Time and Space. J. Neurophysiol. 84: 435-450, 2000. Two
transient sounds, considered as a conditioner followed by a probe, were
delivered successively from the same or different direction in virtual
acoustic space (VAS) while recording from single neurons in primary
auditory cortex (AI) of cats under general anesthesia. Typically, the
response to the probe sound was progressively suppressed as the
interval between the two sounds (ISI) was systematically reduced from
400 to 50 ms, and the sound-source directions were within the cell's
virtual space receptive field (VSRF). Suppression of the cell's
discharge could be accompanied by an increase in response latency. In
some neurons, the joint response to two sounds delivered successively
was summative or facilitative at ISIs below about 20 ms. These
relationships held throughout the VSRF, including those directions on
or near the cell's acoustic axis where sounds often elicit the
strongest response. The strength of suppression varied systematically
with the direction of the probe sound when the ISI was fixed and the
conditioning sound arrived from the cell's acoustic axis. Consequently
a VSRF defined by the response to the lagging probe sound was
progressively reduced in size when ISIs were shortened from 400 to 50 ms. Although the presence of a previous sound reduced the size of the
VSRF, for many of these VSRFs a systematic gradient of response latency
was maintained. The maintenance of such a gradient may provide a
mechanism by which directional acuity remains intact in an acoustic
environment containing competing acoustic transients.
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