Journal
NEUROPSYCHOLOGIA
Volume 42, Issue 12, Pages 1598-1607Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropsychologia.2004.04.012
Keywords
auditory localization; human; psychophysics; low-frequency offline repetitive transcranial magnetic stimulation; space perception
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Neuroimaging studies in human subjects and single-unit recordings in monkeys have suggested the primate posterior parietal cortex (PPC) to be involved in auditory space perception. Here we tested this hypothesis by combining repetitive focal transcranial magnetic stimulation (rTMS) of the right PPC with a task of pointing to free-field-sound stimuli. After a period of 15 min rTMS at 1 Hz, subjects exhibited an overall signed error in pointing by 2.5degrees, directed to the left and downward, with reference to a baseline condition with sham rTMS. No effects of rTMS on the general precision of sound localization (unsigned errors) were found. Thus, low-frequency offline rTMS may have specifically affected neuronal circuits transforming auditory spatial coordinates in both azimuth and elevation. This is in accordance with the view that the PPC may represent a neural substrate of the perceptual stability in spatial hearing. (C) 2004 Elsevier Ltd. All rights reserved.
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