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Auditory facilitation: procedural or sensory effect?

A Miśkiewicz1, S Buus, M Florentine

  • 1Department of Speech-Language Pathology and Audiology (133 FR), Northeastern University, Boston, Massachusetts 02115.

The Journal of the Acoustical Society of America
|September 1, 1994
PubMed
Summary
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Auditory facilitation, a decrease in sound detection threshold after a preceding tone, was reexamined. The study found minimal facilitation (0.5 dB or less) using a modern psychophysical method, suggesting previous large effects were due to response biases.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Psychophysics

Background:

  • Previous studies reported "auditory facilitation," where sound thresholds decrease after prior stimulation.
  • A 1960 study by Rubin found a significant 7-dB negative threshold shift using an up-and-down method.
  • The mechanism and reliability of auditory facilitation require further investigation.

Purpose of the Study:

  • To reexamine auditory facilitation using a contemporary adaptive psychophysical procedure.
  • To quantify the magnitude of auditory facilitation under controlled conditions.
  • To investigate the influence of psychophysical methods on observed facilitation effects.

Main Methods:

  • Auditory thresholds for 20-ms tones (1 and 5 kHz) were measured using a two-interval, two-alternative-forced-choice (2I, 2AFC) adaptive procedure.

Related Experiment Videos

  • Stimuli were presented with and without a preceding 15-dB sensation level (SL), 80-ms cue tone of the same frequency.
  • Cue-signal delays ranged from 80 to 640 ms.

    • Main Results:

    • A small auditory facilitation effect, averaging 0.5 dB or less, was observed.
    • The facilitation magnitude was independent of cue-signal delays between 80 and 640 ms.
    • Replication of Rubin's experiment yielded similar large facilitation effects, confirming the original findings with that method.

    Conclusions:

    • The pronounced auditory facilitation reported by Rubin likely stemmed from biases and criterion shifts inherent in the up-and-down method.
    • The 2I, 2AFC procedure, less susceptible to response biases, reveals a minimal true auditory facilitation effect.
    • This suggests that the post-stimulatory lowering of auditory thresholds is not as substantial as previously indicated by older psychophysical techniques.