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Auditory behavioral thresholds for Japanese macaques using insert earphones

D W Smith1, V B Olszyk

  • 1Division of Otolaryngology-Head and Neck Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA.

American Journal of Primatology
|January 1, 1997
PubMed
Summary
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This study measured auditory thresholds in Japanese macaques, finding similar hearing patterns to other macaque species but potentially higher low-frequency hearing thresholds. These results aid in understanding primate auditory perception.

Area of Science:

  • Primate auditory neuroscience
  • Comparative psychoacoustics

Background:

  • Understanding auditory thresholds in non-human primates is crucial for comparative hearing research.
  • Previous studies have established auditory profiles for various macaque species.

Purpose of the Study:

  • To determine the behavioral auditory thresholds in Japanese macaques (Macaca fuscata).
  • To compare the auditory sensitivity of Japanese macaques with other macaque species.

Main Methods:

  • Operant conditioning with food reinforcement was used to train four Japanese macaques.
  • Auditory stimuli consisted of 1-second pure tones delivered via insert earphones.
  • Behavioral auditory thresholds were measured across a range of frequencies.

Main Results:

Related Experiment Videos

  • Auditory threshold contours in Japanese macaques were generally similar in shape to those of other macaque species.
  • Low-frequency thresholds in this study may have been slightly higher compared to previous reports.
  • Mid- and high-frequency thresholds were at the lower extreme of previously reported ranges for macaque species.

Conclusions:

  • Japanese macaques exhibit auditory sensitivity comparable to other macaque species, with potential variations in low-frequency hearing.
  • Differences in low-frequency thresholds could be attributed to equipment calibration or genuine species-specific variations.
  • The use of insert earphones provided reliable calibration and greater interaural attenuation.