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Intelligibility improves perception of timing changes in speech.

Benedikt Zoefel1,2,3, Rebecca A Gilbert1, Matthew H Davis1

  • 1MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, United Kingdom.

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Summary
This summary is machine-generated.

Perceiving speech as intelligible improves the detection of auditory rhythm irregularities. This suggests that understanding speech, not just its acoustic properties, enhances rhythm perception.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Speech processing

Background:

  • Auditory rhythms are common in music and speech.
  • How perceived rhythms emerge from sound structures is unclear.
  • Speech rhythm perception may depend on acoustic properties or linguistic units.

Purpose of the Study:

  • Investigate if speech intelligibility influences rhythm perception.
  • Differentiate between acoustic and linguistic contributions to speech rhythm.
  • Determine if abstract linguistic units enhance timing perception.

Main Methods:

  • Three experiments used rhythmically spoken speech sequences.
  • Participants detected rhythm irregularities.
  • Acoustic properties were matched between intelligible and unintelligible speech conditions (e.g., vocoding, spectral rotation, sine-wave speech).

Main Results:

  • Rhythm perception improved for intelligible speech compared to unintelligible speech.
  • This effect persisted even when acoustic properties like amplitude modulation and spectral complexity were similar.
  • Perception of sine-wave speech as language (post-training) enhanced rhythm detection.

Conclusions:

  • Speech intelligibility enhances the perception of timing changes.
  • Rhythm perception in speech is linked to extracting abstract linguistic units.
  • Linguistic processing, not just acoustics, plays a key role in auditory rhythm perception.