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Extrinsic cognitive load impairs low-level speech perception.

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Cognitive load from visual tasks impairs speech perception by reducing phonetic detail sensitivity, not by affecting lexical access. This suggests cognitive load impacts the perceptual stage of speech processing.

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Area of Science:

  • Cognitive Psychology
  • Auditory Perception
  • Speech Processing

Background:

  • Extrinsic cognitive load from concurrent tasks can affect speech perception.
  • Previous research suggests increased reliance on lexical knowledge and decreased phonetic detail perception under cognitive load.

Purpose of the Study:

  • To determine if cognitive load affects speech perception at the lexical or sublexical (perceptual) level.
  • To investigate whether increased lexical reliance under cognitive load is a primary effect or a consequence of altered phonetic encoding.

Main Methods:

  • Employed the phoneme restoration paradigm to assess speech perception under varying levels of extrinsic cognitive load.
  • Manipulated the effort required for a concurrent nonlinguistic visual task to induce cognitive load.

Main Results:

  • Perceptual sensitivity significantly decreased (phoneme restoration increased) with increasing cognitive load.
  • Cognitive load had a minimal impact on the contribution of lexical information to phoneme restoration.

Conclusions:

  • The primary locus of extrinsic cognitive load's effect on the speech system is perceptual, not lexical.
  • Cognitive load appears to increase tolerance to acoustic imprecision and broaden phonemic categories during speech perception.