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Temporal integration and multiple looks.

N F Viemeister1, G H Wakefield

  • 1Department of Psychology, University of Minnesota, Minneapolis 55455.

The Journal of the Acoustical Society of America
|August 1, 1991
PubMed
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Temporal integration in hearing does not occur over long durations. New experiments show auditory processing integrates briefly (under 5ms) but treats longer separated sounds independently, challenging long-term integration theories.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • The decrease in auditory detection thresholds with increased signal duration was traditionally attributed to long-term temporal integration.
  • This classical view suggests a continuous summation of auditory information over time.

Purpose of the Study:

  • To investigate the temporal limits of auditory integration.
  • To test the hypothesis that auditory temporal integration is not a long-term process.

Main Methods:

  • Experiment 1: Measured detection thresholds for pairs of brief pulses as a function of temporal separation in quiet.
  • Experiment 2: Assessed the threshold for pulse pairs presented during noise gaps, varying noise levels between pulses.

Main Results:

Related Experiment Videos

  • Auditory integration was observed only for pulse separations less than approximately 5 ms; longer separations showed independent processing.
  • In noise, pulse pair thresholds improved, but were unaffected by changes in masker level between pulses, contradicting long-term integration models.

Conclusions:

  • The findings challenge the classical model of long-term temporal integration in hearing.
  • Results support a 'multiple-look' model where auditory input is sampled and selectively processed from memory.