Sequential processing of interaural timing differences for sound source segregation and spatial localization: Evidence from event-related cortical potentials

Blake W. Johnson*, Michael J. Hautus, Damien J. Duff, Wes C. Clapp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)541-551
Number of pages11
JournalPsychophysiology
Volume44
Issue number4
DOIs
Publication statusPublished - Jul 2007
Externally publishedYes

Keywords

  • Acoustic
  • Auditory evoked potential
  • Interaural time difference
  • Pitch perception
  • Sound localization
  • Sound segregation

Fingerprint

Dive into the research topics of 'Sequential processing of interaural timing differences for sound source segregation and spatial localization: Evidence from event-related cortical potentials'. Together they form a unique fingerprint.

Cite this