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Frequency discrimination in the monkey.

C A Prosen1, D B Moody, M S Sommers

  • 1Kresge Hearing Research Institute, University of Michigan, Ann Arbor 48109.

The Journal of the Acoustical Society of America
|November 1, 1990
PubMed
Summary
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Monkeys show significant variability in frequency discrimination. Long-term training improved this ability, but their frequency difference limens remained larger than humans, suggesting anatomical differences.

Area of Science:

  • Auditory Perception
  • Animal Behavior

Background:

  • Frequency discrimination is crucial for auditory processing.
  • Variability in auditory abilities exists across species.

Purpose of the Study:

  • To evaluate frequency discrimination ability in monkeys over time.
  • To investigate the effects of long-term training on frequency discrimination.
  • To compare frequency discrimination abilities between monkeys and humans.

Main Methods:

  • Used a repeating-standard procedure and method of constant stimuli.
  • Evaluated 11 monkeys over an extended training period.
  • Compared frequency discrimination with intensity discrimination in one subject.

Main Results:

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  • Observed large intersubject variability in frequency difference limens (delta F).
  • Training led to rapid and then slower decreases in delta F.
  • One subject showed a 190-week decrease in delta F, specific to frequency discrimination.
  • Trained monkeys exhibited larger delta F than previously reported and larger than humans.

    • Conclusions:

    • Frequency discrimination ability in monkeys can be improved with extensive training.
    • Long-term training effects are specific to the sensory modality.
    • Monkeys possess less sensitive frequency discrimination than humans, potentially due to anatomical factors.