The Journal of Neuroscience, 2002, 22:RC207:1-5
RAPID COMMUNICATION
Role of the Posterior Parietal Cortex in Spatial Hearing
Jörg
Lewald1, 2,
Henrik
Foltys3, and
Rudolf
Töpper3
1 Institute for Occupational Physiology, D-44139
Dortmund, Germany, 2 Department of Cognitive and
Environmental Psychology, Ruhr University, D-44780 Bochum, Germany, and
3 Department of Neurology, University Hospital of Aachen,
D-52074 Aachen, Germany
The human posterior parietal cortex (PPC) is well known to be
involved in various functions of multisensory spatial perception. However, the specific role of the PPC in hearing has, up to now, remained unclear. To allow more reliable conclusions to be drawn on
this issue, we have used repetitive transcranial magnetic stimulation in healthy subjects. Focal stimulation of the PPC induced a systematic shift in the lateralization of interaural time differences (ITDs, a
main cue for auditory azimuth), whereas the acuity of ITD
discrimination was unaffected. We propose that the PPC is specifically
involved in relating azimuthal angles of sound to the body coordinates and is part of a "where" stream in cortical processing of auditory information.
Key words:
posterior parietal cortex; repetitive transcranial
magnetic stimulation; interaural time differences; sound localization; space perception; psychophysics; human
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