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Does stimulus context affect loudness or only loudness judgments?

B Schneider1, S Parker

  • 1Department of Psychology, University of Toronto, Mississauga, Ontario, Canada.

Perception & Psychophysics
|November 1, 1990
PubMed
Summary
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Stimulus intensity range influences loudness perception across different frequencies. This study suggests range affects loudness perception, not just numerical judgments, challenging previous interpretations of response bias.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Psychophysics

Background:

  • Previous research suggested intensity range affects loudness judgments via response biases, not perception.
  • Magnitude estimation studies indicated range-dependent loudness matches for tones of different frequencies.

Purpose of the Study:

  • To investigate whether stimulus intensity range affects the perception of loudness across frequencies.
  • To determine if loudness perception is altered by intensity range independently of numerical response biases.

Main Methods:

  • Subjects performed pairwise comparisons of loudness intervals between tones of two different frequencies.
  • The intensity ranges of the tones at each frequency were systematically varied.
  • A non-numerical response method was employed to minimize potential response biases.

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Main Results:

  • Cross-frequency loudness matches were significantly affected by the stimulus intensity ranges.
  • A notable difference in matches occurred when one frequency had only soft tones and the other had a broader range.
  • These findings were consistent across different intensity range combinations.

Conclusions:

  • Stimulus intensity range directly influences the perception of loudness across frequencies.
  • The effect of range extends beyond altering numerical judgments, impacting the perceptual experience itself.
  • This challenges the interpretation that range effects are solely due to response biases in loudness estimation.