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Contextual processing of multidimensional and unidimensional auditory stimuli

L E Marks1

  • 1John B. Pierce Laboratory, New Haven, Connecticut 06519.

Journal of Experimental Psychology. Human Perception and Performance
|April 1, 1993
PubMed
Summary

Stimulus context significantly impacts loudness perception. Two distinct context effects were identified: assimilation in unidimensional tasks and adaptation in multidimensional tasks, influencing auditory judgments.

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Area of Science:

  • Auditory perception
  • Psychophysics
  • Sensory neuroscience

Background:

  • Stimulus context influences perception and judgment.
  • Loudness perception is a key area in auditory research.
  • Understanding contextual effects is crucial for explaining sensory processing.

Purpose of the Study:

  • To investigate the different types of context effects in loudness perception.
  • To differentiate between assimilative and contrastive (adaptation-like) effects.
  • To elucidate the temporal and dimensional characteristics of these processes.

Main Methods:

  • Utilized magnitude estimation across 14 experiments to assess loudness.
  • Employed direct loudness comparison in a 15th experiment.
  • Varied stimulus dimensions (intensity and frequency) to explore context effects.

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Main Results:

  • Unidimensional stimulus variation (intensity only) led to assimilative context effects.
  • Multidimensional stimulus variation (frequency and intensity) resulted in contrasting, adaptation-like effects.
  • A frequency-specific adaptation process was identified in direct loudness comparisons.

Conclusions:

  • Loudness perception involves at least two distinct contextual processes.
  • An early perceptual adaptation process and a later response-dependent assimilation process contribute to loudness judgments.
  • These findings offer insights into the complex mechanisms of auditory sensory processing.