New World monkeys are a diverse primate group and a model for understanding hearing in
mammals. However, comparable audiograms do not exist for the larger monkeys, making it
difficult to test the hypothesized relationship between interaural distance and high-frequency
hearing limit (ie, the allometric model). Here, the auditory brainstem response (ABR) method
is used to assess auditory sensitivity in four tufted capuchins (Sapajus apella), a large
monkey with a large interaural distance. A primate-typical four-peak pattern in the ABR …