01996nas a2200181   4500008004100000022001400041245016200055210006900217260001600286300001600302490000800318520134700326100001801673700002401691700002401715700002401739856005101763       2018                        eng d  a0001-496600aForward masking recovery in bottlenose dolphins ( <i>Tursiops truncatus</i>): Auditory brainstem responses to paired-click stimuli in high-pass masking noise0 aForward masking recovery in bottlenose dolphins iTursiops trunca  cJan-09-2018  a1740 - 17400 v1443 a<p>Adaptation is a fundamental process in the auditory system and underlies the automatic gain control system of echolocating bottlenose dolphins. As pulse-echo delay increases, auditory brainstem response (ABR) amplitudes to the echoes progressively increase. This study examined adaptation across cochlear frequency regions using a paired-click (i.e., forward masking) paradigm and high-pass masking noise. Bottlenose dolphins passively listened to paired click stimuli (20&ndash;160 kHz &ldquo;pink&rdquo; spectra). A &ldquo;conditioning&rdquo; click was followed by a &ldquo;probe&rdquo; click with equal amplitude and a time delay ranging from 125 to 750 &mu;s. ABRs to click pairs were obtained with and without high-pass masking noise that precluded the basal turn of the cochlea from responding to the click stimuli. The ABR evoked by a single click (temporally aligned with the first click of the paired-click condition) was subtracted from the click-pair ABR to visualize the response evoked by the probe click. Probe ABR amplitudes recovered linearly with increasing delay relative to the conditioning click, and were approximately 70% of full response amplitude at 750-&mu;s delay. Paired-click interval ABR amplitude recovery functions were similar for the unmasked and high-pass masked conditions. [Work sponsored by ONR.]</p>
1 aMulsow, Jason1 aCoffinger, Sean, P.1 aFinneran, James, J.1 aBurkard, Robert, F.  uhttp://asa.scitation.org/doi/10.1121/1.5067718