title: Effects of fatiguing tone frequency on temporary threshold shift in bottlenose dolphins (Tursiops truncatus).
abstract: Temporary threshold shift (TTS) was measured in two bottlenose dolphins (Tursiops truncatus) after exposure to 16-s tones between 3 and 80 kHz to examine the effects of exposure frequency on the onset, growth, and recovery of TTS. Hearing thresholds were measured approximately one-half octave above the exposure frequency using a behavioral response paradigm featuring an adaptive staircase procedure. Results show frequency-specific differences in TTS onset and growth, and suggest increased susceptibility to auditory fatigue for frequencies between approximately 10 and 30 kHz. Between 3 and 56 kHz, the relationship between exposure frequency and the exposure level required to induce 6 dB of TTS, measured 4 min post-exposure, agrees closely with an auditory weighting function for bottlenose dolphins developed from equal loudness contours [Finneran and Schlundt. (2011). J. Acoust. Soc. Am. 130, 3124-3136].
authors: U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, Code 71510, 53560 Hull Street, San Diego, California 92152, USA. james.finneran@navy.mil
authors: James J
authors: JJ
authors: Finneran
authors: Carolyn E
authors: CE
authors: Schlundt
mesh_terms: D000161:Acoustic Stimulation; D000223:Adaptation, Psychological; D000818:Animals; D001299:Audiometry; D001305:Auditory Fatigue; D001522:Behavior, Animal; D050681:Bottle-Nosed Dolphin / Q000502:physiology / Q000523:psychology*; D005260:Female; D008144:Loudness Perception; D008297:Male; D017711:Nonlinear Dynamics; D011571:Psychoacoustics; D013018:Sound Spectrography; D013997:Time Factors