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Frequency and intensity discrimination in humans and monkeys
The Journal of the Acoustical Society of America
|December 1, 1985
Summary
Humans show better frequency and intensity discrimination than monkeys. Monkeys struggled with intensity decrements, while humans excelled at moderate sound levels.
Area of Science:
- Auditory Neuroscience
- Comparative Psychology
- Psychoacoustics
Background:
- Understanding auditory perception differences between species is crucial for animal models.
- The human auditory system's ability to discriminate subtle changes in sound is well-studied.
- Limited comparative data exists for auditory discrimination tasks between humans and non-human primates.
Purpose of the Study:
- To compare frequency and intensity difference limens (DLs) in humans and monkeys.
- To investigate species-specific performance in auditory discrimination tasks.
- To evaluate the utility of monkeys as models for human speech sound discrimination.
Main Methods:
- A standard 'yes-no' procedure was employed for both human and monkey participants.
- Subjects reported increments and decrements in frequency and intensity of 1.0-kHz tone bursts.
- Difference limens (DLs) were measured across varying sound levels (SL).
Main Results:
- Monkeys exhibited significantly larger DLs for frequency discrimination (approx. 7x) compared to humans.
- Monkey DLs for intensity decrements were unstable and larger than human DLs.
- Overlapping DLs were observed only for intensity increments; humans and monkeys showed similar performance.
Conclusions:
- Humans possess superior auditory discrimination abilities compared to monkeys, particularly for frequency.
- Differences in neural processing, such as temporal vs. rate coding, may underlie performance variations.
- The utility of monkeys as direct models for human speech sound discrimination requires further investigation.