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J Neurophysiol (August 30, 2006). doi:10.1152/jn.00392.2006
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Submitted on April 13, 2006
Accepted on August 22, 2006

Effects of stimulus azimuth and intensity on the single neuron activity in the auditory cortex of the alert macaque monkey

Timothy M Woods1, Steve E. Lopez1, James H Long1, Joanne E. Rahman1, and Gregg H. Recanzone1*

1 Center for Neuroscience, University of California at Davis, Davis, California, United States

* To whom correspondence should be addressed. E-mail: ghrecanzone{at}ucdavis.edu.

It has been hypothesized that the primate auditory cortex is composed of at least two processing streams, one of which is believed to selectively process spatial information. To test whether spatial information is differentially encoded in different auditory cortical fields we recorded the responses of single neurons in the auditory cortex of alert macaque monkeys to broadband noise stimuli presented from 360 degrees in azimuth at four different absolute intensities. Cortical areas tested were core areas A1 and R, caudal belt fields CM and CL and more rostral belt fields ML and MM. We found that almost all neurons encountered showed some spatial tuning. However, spatial selectivity measures showed that the caudal belt fields had the sharpest spatial tuning, A1 had intermediate spatial tuning, and areas R and MM had the least spatial tuning. Although most neurons showed their best responses to contralateral space, best azimuths were observed across the entire 360 degrees of tested space. We also noted that while the responses of many neurons were significantly influenced by eye position, eye position did not systematically influence any of the spatially-dependent responses that we measured. These data are consistent with the hypothesis that caudal auditory cortical fields in the primate process spatial features more accurately than the core and more rostral belt fields.




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