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Auditory sensitivity and equal loudness in the squirrel monkey (Saimiri sciureus)

Journal of the Experimental Analysis of Behavior

|March 1, 1975

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The type of reinforcer did not affect auditory sensitivity or equal-loudness perception in squirrel monkeys. Their hearing range extended to 46 kHz, with peak sensitivity at 8 kHz.

Area of Science:

Auditory Neuroscience
Animal Behavior

Background:

Understanding auditory perception in non-human primates provides insights into the evolution of hearing.
Squirrel monkeys are a relevant model for studying auditory processing due to their complex vocalizations and hearing capabilities.

Purpose of the Study:

To investigate the influence of different reinforcers (electric shock vs. food) on auditory sensitivity and equal-loudness functions in squirrel monkeys.
To determine the audible frequency range and map equal-loudness contours in this species.

Main Methods:

Operant conditioning was used, requiring monkeys to perform a bar-press task in response to auditory stimuli.
Two experiments employed different reinforcers: electric shock postponement and food reward for bar release.
Auditory sensitivity thresholds and latency of response were measured to construct equal-loudness contours.

Related Experiment Videos

Main Results:

Auditory sensitivity functions and acuity levels were consistent across both reinforcer types.
The squirrel monkey's audible frequency range spanned below 0.125 kHz to 46 kHz, with maximum sensitivity at 8 kHz.
Equal-loudness contours showed frequency-dependent patterns, paralleling threshold curves at lower sound-pressure levels and flattening at higher levels.

Conclusions:

The type of reinforcer (electric shock or food) does not alter the fundamental shape of auditory sensitivity or equal-loudness functions in squirrel monkeys.
The findings contribute to a detailed understanding of auditory perception in primates, independent of motivational state variations induced by different rewards.