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Behaviorally determined thresholds of audition for three species of monkey (squirrel, rhesus, and cynamolgus) are reported. Three different testing procedures were utilized for measuring the threshold: namely, avoidance conditioning in a double-grill cage and bar-pressing procedures with reward and avoidance reinforcements. There was good agreement among the audiograms obtained for various species despite the different conditioning procedures used.
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Fujita et al. (1965) studied this question.
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