title: Using the auditory steady-state response to assess temporal dynamics of hearing sensitivity during bottlenose dolphin echolocation.
abstract: The auditory steady-state response (ASSR) to an external tone was measured in an echolocating dolphin to determine if hearing sensitivity changes could be tracked over time scales corresponding to single click-echo pairs. Individual epochs containing click-echo pairs were first extracted from the instantaneous electroencephalogram. Epochs were coherently averaged using the external tone modulation rate as a timing reference, then Fourier transformed using a sliding, 10-ms temporal window to obtain the ASSR amplitude as a function of time. The results revealed a decrease in the ASSR amplitude at the time of click emission, followed by a 25-70 ms recovery.
authors.affiliation: U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, Code 71510, 53560 Hull Street, San Diego, California 92152.
authors.forename: James J
authors.initials: JJ
authors.lastname: Finneran
authors.forename: Jason
authors.initials: J
authors.lastname: Mulsow
authors.forename: Dorian S
authors.initials: DS
authors.lastname: Houser
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001309:Auditory Threshold; D050681:Bottle-Nosed Dolphin / Q000502:physiology* / Q000523:psychology; D004455:Echolocation; D004569:Electroencephalography; D005583:Fourier Analysis; D006309:Hearing; D008297:Male; D020127:Recovery of Function; D013018:Sound Spectrography; D013997:Time Factors