Temporal resolution in the dolphin's auditory system revealed by double-click evoked potential study.
Temporal resolution of hearing in two bottlenosed dolphins was estimated by measuring auditory brain-stem response (ABR) recovery in conditions of double-click stimuli. From these data, temporal transfer function of the supposed integrator was derived assuming nonlinear transform of the integrator output to ABR amplitude. The obtained temporal transfer function showed a nearly constant level up to 200 microseconds. then decay to approximately -3 dB at 300 microseconds (as presented in the sound intensity domain), and subsequent decay of 10-11 dB per time doubling (about 35 dB/decade).
Supin AYa
Institute of Evolutionary Morphology and Animal Ecology, Russian Academy of Sciences, Moscow.
Popov
V V
VV
D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D004289:Dolphins / Q000502:physiology*; D005072:Evoked Potentials, Auditory; D016057:Evoked Potentials, Auditory, Brain Stem; D006801:Humans; D008297:Male; D013997:Time Factors