Journal
HEARING RESEARCH
Volume 229, Issue 1-2, Pages 14-23Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.heares.2007.01.003
Keywords
monkey; vocalization; lateralization; multisensory; temporal pole; superior temporal gyrus
Funding
- Intramural NIH HHS Funding Source: Medline
- NIDCD NIH HHS [R01 DC007156] Funding Source: Medline
- NIMH NIH HHS [R03 MH066922-01] Funding Source: Medline
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Just as cortical visual processing continues far beyond the boundaries of early visual areas, so too does cortical auditory processing continue far beyond the limits of early auditory areas. In passively listening rhesus monkeys examined with metabolic mapping techniques. cortical areas reactive to auditory stimulation were found to include the entire length of the superior temporal gyrus (STG) as well as several other regions within the temporal, parietal, and frontal lobes. Comparison of these widespread activations with those from an analogous study in vision Supports the notion that audition, like vision, is served by several cortical processing streams, each specialized for analyzing a different aspect of sensory input, such as stimulus quality, location, or motion. Exploration with different classes of acoustic stimuli demonstrated that most portions of STG show greater activation on the right than on the left regardless of stimulus class. However, there is a striking shift to left-hemisphere dominance during passive listening to species-specific vocalizations, though this reverse asymmetry is observed only in the region of temporal pole. The mechanism for this left temporal pole dominance' appears to be suppression of the right temporal pole by the left hemisphere, as demonstrated by a comparison of the results in normal monkeys with those in split-brain monkeys. (c) 2007 Elsevier B.V. All rights reserved.
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