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Related Experiment Videos

Processing unattended speech.

Marie Rivenez1, Christopher J Darwin, Anne Guillaume

  • 1Laboratoire de Psychologie Expérimentale, CNRS, Université René Descartes, Institut de Mèdecine Aérospatiale du Service de Santé des Armées, France. mrivenez@imassa.fr

The Journal of the Acoustical Society of America
|July 15, 2006
PubMed
Summary

A difference in voice pitch, or fundamental frequency (F0) range, allows listeners to process unattended speech. This pitch difference enables repetition priming effects even when attention is divided.

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Area of Science:

  • Auditory perception
  • Cognitive psychology
  • Speech processing

Background:

  • Previous research indicated unattended speech processing only occurred with isolated words.
  • Listeners may process unattended speech if it can attract attention.
  • Continuous unattended speech processing is less understood.

Purpose of the Study:

  • To investigate the impact of fundamental frequency (F0) range differences on unattended speech processing.
  • To determine if pitch differences facilitate priming effects from continuous unattended speech.
  • To explore the role of attention in processing continuous unattended speech.

Main Methods:

  • Modified a rapid word categorization task with simultaneous attended and unattended speech streams.
  • Introduced repetition primes in the unattended stream before target words.

Related Experiment Videos

  • Manipulated the fundamental frequency (F0) range difference between the two voice streams.
  • Measured reaction times for target word detection in the attended stream.

    • Main Results:

    • A 25 ms speeding of target detection occurred when unattended speech had a different F0 range.
    • This priming effect persisted regardless of target ear but vanished without F0 difference.
    • Priming was replicated even when participants focused on the attended message for a secondary task.

    Conclusions:

    • Continuous unattended speech can be processed to produce repetition priming effects.
    • A difference in fundamental frequency (F0) range between voices is crucial for this processing.
    • Auditory scene analysis, using pitch differences, aids in separating and processing simultaneous speech streams.