Perception & Psychophysics

, Volume 70, Issue 8, pp 1558–1570 | Cite as

One sound or two? Object-related negativity indexes echo perception

  • Lisa D. Sanders
  • Amy S. Joh
  • Rachel E. Keen
  • Richard L. Freyman
Article
  • 266 Downloads

Abstract

The ability to isolate a single sound source among concurrent sources and reverberant energy is necessary for understanding the auditory world. The precedence effect describes a related experimental finding, that when presented with identical sounds from two locations with a short onset asynchrony (on the order of milliseconds), listeners report a single source with a location dominated by the lead sound. Single-cell recordings in multiple animal models have indicated that there are low-level mechanisms that may contribute to the precedence effect, yet psychophysical studies in humans have provided evidence that top-down cognitive processes have a great deal of influence on the perception of simulated echoes. In the present study, event-related potentials evoked by click pairs at and around listeners' echo thresholds indicate that perception of the lead and lag sound as individual sources elicits a negativity between 100 and 250 msec, previously termed the object-related negativity (ORN). Even for physically identical stimuli, the ORN is evident when listeners report hearing, as compared with not hearing, a second sound source. These results define a neural mechanism related to the conscious perception of multiple auditory objects.

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Copyright information

© Psychonomic Society, Inc. 2008

Authors and Affiliations

  • Lisa D. Sanders
    • 1
  • Amy S. Joh
    • 2
  • Rachel E. Keen
    • 2
  • Richard L. Freyman
    • 1
  1. 1.Department of PsychologyUniversity of MassachusettsAmherst
  2. 2.University of VirginiaCharlottesville

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