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Precision of working memory for speech sounds.

Sabine Joseph1, Paul Iverson, Sanjay Manohar

  • 1a Institute of Cognitive Neuroscience, University College London , London , UK.

Quarterly Journal of Experimental Psychology (2006)
|January 22, 2015
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Summary

Verbal working memory (WM) for speech sounds becomes less precise as more items are stored. When memory load increases, representations shift from continuous to categorical for better storage.

Keywords:
ContinuousPrecisionSpeechVerbalWorking memory

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Area of Science:

  • Cognitive psychology
  • Auditory perception
  • Speech processing

Background:

  • Verbal working memory (WM) is crucial for processing speech.
  • Traditional measures quantify WM capacity as discrete items.
  • Recent research suggests visual WM may use continuous representations.

Purpose of the Study:

  • To investigate the precision of memory for speech sounds.
  • To determine if verbal WM utilizes continuous or categorical storage mechanisms.
  • To examine how memory load affects speech sound representation.

Main Methods:

  • Developed a novel speech matching paradigm.
  • Measured WM recall precision for phonemes using analogue response scales.
  • Analyzed vowel quality recall variability and response clustering.

Main Results:

  • Recall precision for speech sounds gradually declined with increased memory load.
  • Memory representations became noisier and distorted the perceptual space with higher load.
  • A shift from continuous to categorical memory representations occurred as memory load increased.

Conclusions:

  • Verbal WM for speech sounds relies on both continuous and categorical storage.
  • Direct acoustic storage is used for single items.
  • Categorical representations become dominant when storing multiple speech items to manage cognitive load.