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Related Experiment Video

Updated: Jan 15, 2026

A Method to Study Adaptation to Left-Right Reversed Audition
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How sleep redraws phonemic categories after auditory selective adaptation.

Nicolas Dumay1,2, Arthur G Samuel3,4,5

  • 1Department of Psychology, University of Exeter, Perry Road, Exeter, EX4 4QG, UK. n.dumay@exeter.ac.uk.

Psychonomic Bulletin & Review
|January 14, 2026
PubMed
Summary
This summary is machine-generated.

Sleep does not consolidate speech sound adaptation. Instead, sleep recalibrates phoneme category perception, increasing sensitivity to previously adapted sounds, a phenomenon termed "reverse adaptation".

Keywords:
Frequency effectsMemory consolidationPerceptual learningPhonemic categoriesSelective adaptationSleepSpeech perception

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Area of Science:

  • Cognitive Neuroscience
  • Speech Perception
  • Sleep Research

Background:

  • Sleep is known to consolidate new memories and clear unnecessary information.
  • Selective adaptation to speech sounds temporarily alters perception.
  • The role of sleep in modulating these speech-specific perceptual adjustments is unclear.

Purpose of the Study:

  • To investigate the effect of sleep on selective adaptation of speech categories.
  • To determine if sleep consolidates or modifies established speech perceptual adjustments.

Main Methods:

  • Participants underwent speech sound-selective adaptation.
  • The impact of subsequent sleep versus wakefulness on adaptation was measured.
  • Phoneme category perception was assessed before and after the sleep/wake period.

Main Results:

  • Sleep did not consolidate the selective adaptation effect.
  • Instead, sleep led to a recalibration of phoneme category frequency.
  • Sleep increased perception of sounds similar to the adapting stimulus, showing 'reverse adaptation'.

Conclusions:

  • Sleep does not simply preserve adaptation but actively modifies speech category representations.
  • The findings support models of phoneme category adjustment with distinct assimilative and contrastive mechanisms.
  • Sleep plays a crucial role in updating perceptual categories based on recent auditory experience.