Journal
NEUROSCIENTIST
Volume 8, Issue 1, Pages 73-83Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/107385840200800112
Keywords
sound localization; auditory cortex; spatial hearing
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Funding
- NIDCD NIH HHS [R01 DC00420] Funding Source: Medline
- PHS HHS [P01 00078] Funding Source: Medline
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Efforts to locate a cortical map of auditory space generally have proven unsuccessful. At moderate sound levels, cortical neurons generally show large or unbounded spatial receptive fields. Within those large receptive fields, however, changes in sound location result in systematic changes in the temporal firing patterns such that single-neuron firing patterns can signal the locations of sound sources throughout as much as 360 degrees of auditory space. Neurons in the cat's auditory cortex show accurate localization of broad-band sounds, which human listeners localize accurately. Conversely, in response to filtered sounds that produce spatial illusions in human listeners, neurons signal systematically incorrect locations that can be predicted by a model that also predicts the listeners' illusory reports. These results from the cat's auditory cortex, as well as more limited results from nonhuman primates, suggest a model in which the location of any particular sound source is represented in a distributed fashion within individual auditory cortical areas and among multiple cortical areas.
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