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lüll Exploring the extent and function of higher-order auditory cortex in rhesus monkeys Poremba A; Mishkin MHear Res 2007[Jul]; 229 (1-2): 14-23Just 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.|Acoustic Stimulation[MESH]|Animals[MESH]|Auditory Cortex/*anatomy & histology/diagnostic imaging/metabolism/*physiology[MESH]|Auditory Perception/physiology[MESH]|Brain Mapping[MESH]|Deoxyglucose/pharmacokinetics[MESH]|Dominance, Cerebral/physiology[MESH]|Macaca mulatta/*anatomy & histology/*physiology[MESH]|Positron-Emission Tomography[MESH]|Visual Cortex/anatomy & histology/physiology[MESH]|Visual Perception/physiology[MESH]|Vocalization, Animal[MESH] |