Time-course of posterior parietal and occipital cortex contribution to sound localization

Olivier Collignon*, Marco Davare, Anne G. De Volder, Colline Poirier, Etienne Olivier, Claude Veraart

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


It has been suggested that both the posterior parietal cortex (PPC) and the extrastriate occipital cortex (OC) participate in the spatial processing of sounds. However, the precise time-course of their contribution remains unknown, which is of particular interest, considering that it could give new insights into the mechanisms underlying auditory space perception. To address this issue, we have used event-related transcranial magnetic stimulation (TMS) to induce virtual lesions of either the right PPC or right OC at different delays in subjects performing a sound lateralization task. Our results confirmed that these two areas participate in the spatial processing of sounds. More precisely, we found that TMS applied over the right OC 50 msec after the stimulus onset significantly impaired the localization of sounds presented either to the right or to the left side. Moreover, right PPC virtual lesions induced 100 and 150 msec after sound presentation led to a rightward bias for stimuli delivered on the center and on the left side, reproducing transiently the deficits commonly observed in hemi-neglect patients. The finding that the right OC is involved in sound processing before the right PPC suggests that the OC exerts a feedforward influence on the PPC during auditory spatial processing.

Original languageEnglish
Pages (from-to)1454-1463
Number of pages10
JournalJournal of Cognitive Neuroscience
Issue number8
Publication statusPublished - 1 Aug 2008
Externally publishedYes

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience


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