Journal
HEARING RESEARCH
Volume 198, Issue 1-2, Pages 116-124Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.heares.2004.07.017
Keywords
macaque; sound; localization; intensity
Funding
- NEI NIH HHS [R01 EY 013458, EY-12576] Funding Source: Medline
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Sound localization performance is degraded at low stimulus intensities in humans, and while the sound localization ability of humans and macaque monkeys appears similar, the effects of intensity have yet to be described in the macaque. We therefore defined the ability of four macaque monkeys to localize broadband noise stimuli at four different absolute intensities and six different starting locations in azimuth. Results indicate that performance was poorest at the lowest intensity tested (25 dB SPL), intermediate at 35 dB SPL, and equivalent at 55 and 75 dB SPL. Localization performance was best at 0degrees (directly in front of the animal) and was systematically degraded at more peripheral locations (+/-30degrees and 90degrees) and worst at a location directly behind the animal. Reaction times showed the same trends, with reaction times increasing with decreasing stimulus intensity, even under conditions where the monkey discriminated the location change with the same performance. These results indicate that sound level as well as position profoundly influences sound localization ability. (C) 2004 Elsevier B.V. All rights reserved.
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