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Science 29 May 1998:
Vol. 280. no. 5368, pp. 1439 - 1444
DOI: 10.1126/science.280.5368.1439
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Reports

Optimizing Sound Features for Cortical Neurons

R. Christopher deCharms, David T. Blake, Michael M. Merzenich *

The brain's cerebral cortex decomposes visual images into information about oriented edges, direction and velocity information, and color. How does the cortex decompose perceived sounds? A reverse correlation technique demonstrates that neurons in the primary auditory cortex of the awake primate have complex patterns of sound-feature selectivity that indicate sensitivity to stimulus edges in frequency or in time, stimulus transitions in frequency or intensity, and feature conjunctions. This allows the creation of classes of stimuli matched to the processing characteristics of auditory cortical neurons. Stimuli designed for a particular neuron's preferred feature pattern can drive that neuron with higher sustained firing rates than have typically been recorded with simple stimuli. These data suggest that the cortex decomposes an auditory scene into component parts using a feature-processing system reminiscent of that used for the cortical decomposition of visual images.

Keck Center for Integrative Neuroscience, University of California, San Francisco, San Francisco, CA 94143-0732, USA.
*   To whom correspondence should be addressed. E-mail: merz{at}keck.ucsf.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)