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Auditory frequency discrimination in the squirrel monkey.
A Wienicke1, U Häusler, U Jürgens
1Neurobiology Department, German Primate Centre, Göttingen, Germany.
Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|June 13, 2001
Summary
Squirrel monkeys show poor frequency discrimination at low and high frequencies, deviating significantly from Weber's law. Their auditory capabilities are comparable to humans only in a narrow mid-range frequency band.
Area of Science:
- Auditory Neuroscience
- Animal Behavior
Background:
- Understanding auditory perception in non-human primates is crucial for comparative studies of hearing.
- Squirrel monkeys (Saimiri sciureus) are widely used models for sensory research.
Purpose of the Study:
- To investigate the frequency discrimination capacity of squirrel monkeys.
- To compare their auditory performance with human hearing capabilities.
Main Methods:
- Eyeblink classical conditioning procedure was employed.
- Pure tones served as conditioned stimuli, with air puffs as unconditioned stimuli.
- Absolute and relative frequency difference thresholds were measured across various frequencies.
Main Results:
- Frequency discrimination was best in the 4,000-8,000 Hz range (mean 30 Hz absolute difference).
- Performance significantly declined at lower (e.g., 300 Hz, mean 80 Hz absolute difference) and higher frequencies (e.g., 16,000 Hz, mean 82 Hz absolute difference).
- Relative frequency difference thresholds showed a marked increase at lower frequencies, deviating from Weber's law.
Conclusions:
- Squirrel monkey frequency discrimination deviates significantly from Weber's law, particularly at lower frequencies.
- Their auditory performance is comparable to humans only in a specific mid-frequency range (4,000-8,000 Hz).
- High auditory thresholds do not correlate with poor frequency discrimination ability.