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Divided attention disrupts perceptual encoding during speech recognition.

Sven L Mattys1, Shekeila D Palmer1

  • 1Department of Psychology, University of York, Heslington, York YO10 5DD, United Kingdom.

The Journal of the Acoustical Society of America
|March 20, 2015
PubMed
Summary
This summary is machine-generated.

Cognitive load from secondary tasks impairs speech processing by disrupting sublexical encoding, not lexical access. This suggests auditory perception is affected, impacting word identification under dual-task conditions.

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Area of Science:

  • Cognitive psychology
  • Auditory perception
  • Speech processing

Background:

  • Concurrent tasks negatively impact speech processing.
  • Cognitive load may affect lexical knowledge or perceptual sensitivity.
  • The exact mechanism of speech disruption under load is unclear.

Purpose of the Study:

  • To investigate the locus of speech processing disruption under cognitive load.
  • To differentiate between post-lexical bias and impaired perceptual sensitivity.

Main Methods:

  • Used a forced-choice task to identify noise-degraded spoken words.
  • Manipulated cognitive load by adding a concurrent visual task.
  • Analyzed word selection biases under different load conditions.

Main Results:

  • Cognitive load increased selection of acoustically similar, lower-frequency words.
  • No evidence of a high-frequency response bias under cognitive load.
  • Findings suggest disruption occurs before or during sublexical encoding.

Conclusions:

  • Cognitive load appears to disrupt sublexical encoding during speech processing.
  • Impaired perceptual acuity at the auditory periphery is a likely mechanism.
  • This disruption affects the ability to accurately identify speech sounds under load.