Studies on the hearing of the owl monkey (Aotus trivirgatus)

A study was made of the auditory sensitivity of the owl monkey (Aotus trivirgatus). Absolute thresholds for hearing as a function of tone frequency (audibility function) were measured by a behavioral conditioning procedure. The owl monkey's audibility function was found to be more similar to those of other monkeys than those of nocturnal prosimians. It was concluded that the owl monkey's auditory sensitivity cannot be regarded as specialized for nocturnality.