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Head movements while recognizing speech arriving from behind.

Yi Shen1, Monica L Folkerts2, Virgina M Richards2

  • 1Department of Speech and Hearing Sciences, Indiana University Bloomington, 200 South Jordan Avenue, Bloomington, Indiana 47405-7000, USA shen2@indiana.edu.

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Summary
This summary is machine-generated.

Listeners sometimes turn their heads during speech recognition tasks, especially in noisy environments. These head movements, observed in some participants, were directed towards the speech source but did not optimize sound reception.

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Area of Science:

  • Auditory Neuroscience
  • Human Auditory Perception
  • Speech Processing

Background:

  • Understanding how listeners process speech in complex acoustic environments is crucial.
  • Head movements can influence auditory perception, but their role in speech recognition with competing sounds is not fully understood.

Purpose of the Study:

  • To investigate listeners' head movements during speech recognition with simultaneous auditory maskers.
  • To determine if head movements are employed as a strategy to enhance speech intelligibility under challenging listening conditions.

Main Methods:

  • Measured head movements of ten listeners during a speech recognition task.
  • Presented target speech and simultaneous maskers from distinct spatial locations behind the listener.
  • Varied the target-to-masker ratio (TMR) and masker type (noise vs. competing speech).

Main Results:

  • Four out of ten listeners exhibited frequent head turns, primarily oriented towards the target speech source.
  • Head turning frequency increased at lower target-to-masker ratios (TMRs).
  • When the masker was competing speech, larger head orientation angles were observed at lower TMRs.

Conclusions:

  • Observed head movements suggest an attempt to orient towards the target speech.
  • These head movements do not align with strategies aimed at maximizing monaural target level or binaural unmasking.
  • Listeners may employ head movements in speech recognition, but not necessarily for optimal acoustic benefit.