Abstract:
:Auditory spatial functions, including the ability to discriminate between the positions of nearby sound sources, are subserved by a large temporo-parieto-frontal network. With the aim of determining whether and when the parietal contribution is critical for auditory spatial discrimination, we applied single pulse transcranial magnetic stimulation on the right parietal cortex 20, 80, 90 and 150 ms post-stimulus onset while participants completed a two-alternative forced choice auditory spatial discrimination task in the left or right hemispace. Our results reveal that transient TMS disruption of right parietal activity impairs spatial discrimination when applied at 20 ms post-stimulus onset for sounds presented in the left (controlateral) hemispace and at 80 ms for sounds presented in the right hemispace. We interpret our finding in terms of a critical role for controlateral temporo-parietal cortices over initial stages of the building-up of auditory spatial representation and for a right hemispheric specialization in integrating the whole auditory space over subsequent, higher-order processing stages.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
At A,Spierer L,Clarke Sdoi
10.1016/j.neuropsychologia.2011.05.024subject
Has Abstractpub_date
2011-07-01 00:00:00pages
2794-7issue
9eissn
0028-3932issn
1873-3514pii
S0028-3932(11)00273-9journal_volume
49pub_type
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