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Related Experiment Videos

Informational masking and auditory attention.

M R Leek1, M E Brown, M F Dorman

  • 1Army Audiology and Speech Center, Walter Reed Army Medical Center, Washington, DC 20307-5001.

Perception & Psychophysics
|September 1, 1991
PubMed
Summary

Auditory attention can be focused by isolating target sounds in frequency or intensity, reducing informational masking. This study quantizes the gradual shift from diffuse to focused attention in auditory perception.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Cognitive Psychology

Background:

  • Informational masking degrades auditory perception of signals within similar sounds.
  • It is distinct from energetic masking, which involves physical signal-masker interactions.

Purpose of the Study:

  • To investigate the systematic release from informational masking.
  • To quantify the effect of frequency and intensity isolation on auditory attention.

Main Methods:

  • A nine-tone rapid auditory sequence was used with a target tone.
  • Target tone isolation in frequency and intensity was systematically varied.
  • Frequency difference limens were measured to assess performance.

Main Results:

  • Increasing frequency or intensity isolation of the target tone reduced informational masking.
  • Performance improvements were observed with greater isolation, indicating focused auditory attention.
  • Each 1-dB intensity increase yielded performance gains comparable to a 2% frequency isolation increase.

Conclusions:

  • Auditory attention can be modeled as frequency and intensity bands.
  • Frequency isolation aligns with auditory filter predictions.
  • An intensity attention band of approximately 5-7 dB was identified.

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