Abstract
Auditory duration DLs at 2 kHz were measured in Old World monkeys (Macaca, Cercopithecus) and humans using a repeating standard AX procedure and positive reinforcement operant conditioning techniques. For a 200-ms standard tone, monkey DLs (45–62 ms) were about 2–3 times larger than human (15–27 ms), Weber fractions (ΔT/T) for all species were smallest at standard durations of 200 and 400 ms and increased with decreasing standard duration. DLs for all species did not vary as a function of sensation level from 30 to 60 dB, but were elevated slightly at 20 dB. Monkeys experienced difficulty in discriminating duration decrements, in contrast to humans. Results are related to other comparative psychoacoustic data and vocal communication. [Work supported by NSF and the Guggenheim Foundation.]
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