Incidence of spontaneous otoacoustic emissions in macaque monkeys: a replication.

An earlier survey of spontaneous otoacoustic emissions (SOEs) in Old- and New-World monkeys identified three of 61 animals (5%) as emitters. Since all three emitting monkeys belonged to the macaque genus, the present study was conducted in a group of 102 pigtail monkeys in an attempt to corroborate the incidence of SOEs in a readily available macaque species. This examination revealed nine primates (9%) with SOEs with three demonstrating bilateral emissions. These results demonstrate that the macaque monkey offers a unique nonhuman primate model for the study of SOE phenomena.