High-Frequency Hearing Loss in Old (25+ Years Old) Male Dolphins. (Reannouncementwith New Availability Information)

摘要

Eight bottlenose dolphins (four male, four female) were studied in an acousticresponse time task. The animals were trained to station 1 m below the water surface and respond to a stimulus tone (St) delivered through a hydrophone located 1 m in front of the blowhole. St duration varied from 60 to 450 ms and frequencies were 20, 40, 50, 60, 70, 80, 100, and 120 kHz. St were 120 db (re: 1