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Sequential processing of interaural timing differences for sound source segregation and spatial localization: Evidence from event‐related cortical potentials
Author(s) -
Johnson Blake W.,
Hautus Michael J.,
Duff Damien J.,
Clapp Wes C.
Publication year - 2007
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2007.00535.x
Subject(s) - psychology , perception , latency (audio) , sound localization , audiology , task (project management) , event related potential , auditory event , auditory perception , communication , electroencephalography , cognitive psychology , cognition , neuroscience , computer science , management , economics , medicine , telecommunications
Cortical processing of interaural timing differences (ITDs) was investigated with event‐related potential (ERP) measurements in 16 human participants who were required in separate tasks to detect or to spatially localize dichotically embedded pitches. ITDs elicited three ERP components labeled ORN, N2, and P400. The ORN occurred at a latency of 150–250 ms and was elicited by ITDs regardless of location or task. In contrast, the N2 response (250–350 ms) was strongly modulated by location and showed larger amplitudes for the localization task than for the detection task. Finally, ITDs in the detection task elicited a P400 at a latency of 400–500 ms, but this response was entirely absent from ERPs elicited by identical stimuli in the localization task. These results are consistent with a sequential model of auditory perception in which segregation of concurrent sounds is followed by domain‐specific processing of object location and identity.