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1 Department of Cognitive Science, University of California Irvine, Irvine, CA, USA
2 Department of Anatomy and Neurobiology, University of California Irvine, Irvine, CA, USA
* To whom correspondence should be addressed. E-mail: lmkitzes{at}uci.edu.
The topographical response of a portion of an isofrequency contour in primary cat auditory cortex (AI) to a series of monaural and binaural stimuli was studied. Responses of single neurons to monaural and a matrix of binaural CF tones, varying in average binaural level (ABL) and interaural level differences (ILD), were recorded. The topography of responses to monaural and binaural stimuli was appreciably different. Patches of cells that responded monotonically to increments in ABL alternated with patches that responded nonmonotonically to ABL. The patches were between 0.4 and 1mm in length along an isofrequency contour. Differences were found among monotonic patches and among nonmonotonic patches. Topographically activated and silent populations of neurons varied with both changes in ILD and changes in ABL, suggesting that the area of responsive units may underlie the coding of sound level and sound location.
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