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fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals
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Selectivity of modulation interference for consonant identification in normal-hearing listeners.

Frédéric Apoux1, Sid P Bacon

  • 1Psychoacoustics Laboratory, Department of Speech and Hearing Science, Arizona State University, PO Box 870102, Tempe, Arizona 85287-0102, USA. apoux@psycho.univ-paris5.fr

The Journal of the Acoustical Society of America
|March 19, 2008
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Summary

Amplitude modulation (AM) in noise can disrupt speech recognition, with interference varying by modulation frequency. This suggests envelope fluctuations around 4 and 16 Hz are crucial for understanding speech.

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Area of Science:

  • Auditory Neuroscience
  • Speech Perception Research
  • Psychoacoustics

Background:

  • Speech recognition relies on processing temporal information within the speech envelope.
  • Understanding which modulation frequencies are critical for speech intelligibility is key to auditory processing research.

Purpose of the Study:

  • To investigate if amplitude modulation (AM) in a remote spectral region interferes with speech recognition.
  • To determine if this interference is dependent on the rate of AM.
  • To identify critical modulation frequencies for speech envelope processing.

Main Methods:

  • Consonant identification was tested using speech in either low- or high-frequency bands.
  • Interference was introduced by amplitude-modulated noise in the opposite frequency region.
  • Modulation frequencies tested were 4, 16, 32, and 64 Hz.

Main Results:

  • Amplitude modulation interference occurred across all tested modulator types and speech band locations.
  • Speech recognition interference was significantly dependent on modulation frequency, indicating selectivity.
  • The most significant interference effects were observed at modulation frequencies of 4 Hz and 16 Hz.

Conclusions:

  • The study supports the importance of envelope fluctuations around 4 Hz and 16 Hz for speech recognition.
  • Selectivity in modulation interference suggests specific processing channels for speech envelope information.
  • While lower rates are primary, faster modulation rates may also contribute to speech intelligibility.