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The Journal of Neuroscience, September 20, 2006, 26(38):9820-9832; doi:10.1523/JNEUROSCI.3061-06.2006

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Behavioral/Systems/Cognitive
Monkey Sound Localization: Head-Restrained versus Head-Unrestrained Orienting

Luis C. Populin

Department of Anatomy and Neuroscience Training Program, University of Wisconsin–Madison, Madison, Wisconsin 53706

Correspondence should be addressed to Luis C. Populin, Department of Anatomy, University of Wisconsin–Madison, 1300 University Avenue, Madison, WI 53706. Email: lpopulin{at}wisc.edu

The sound localization abilities of three rhesus monkeys were tested under head-restrained and head-unrestrained conditions. Operant conditioning and the magnetic search coil technique were used to measure eye and head movements to sound sources. Whereas the results support previous findings that monkeys localize sounds very poorly with their heads restrained, the data also reveal for the first time that monkeys localize sounds much more accurately and with less variability when their heads are allowed to move. Control experiments using acoustic stimuli known to produce spatial auditory illusions such as summing localization confirmed that the monkeys based their orienting on localizing the sound sources and not on remembering spatial locations that resulted in rewards. Overall, the importance of using ecologically valid behaviors for studies of sensory processes is confirmed, and the potential of the rhesus monkey, the model closest to human, for studies of spatial auditory function, is established.

Key words: rhesus monkey; head-restrained orienting; head-unrestrained orienting; sound localization; summing localization; Franssen effect

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Received July 19, 2006; revised Aug. 16, 2006; accepted Aug. 19, 2006.

Correspondence should be addressed to Luis C. Populin, Department of Anatomy, University of Wisconsin–Madison, 1300 University Avenue, Madison, WI 53706. Email: lpopulin{at}wisc.edu

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				N. J. Gandhi and D. L. Sparks Dissociation of Eye and Head Components of Gaze Shifts by Stimulation of the Omnipause Neuron Region J Neurophysiol, July 1, 2007; 98(1): 360 - 373. [Abstract] [Full Text] [PDF]

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