Representing multiple discrimination cues in a computational model of the bottlenose dolphin auditory system
(A) Time amplitude representation of a bottlenose dolphin “click” recorded directly in front of the dolphin (on-axis) with (B) the power spectrum magnitude of the click.
(Color online) (A) roex filters ( Lemonds, 1999 ) superimposed with gammatone filters from the current model. The filters are almost identical to . (B) frequency response of 50 gammatone filters spaced between 11 and .
Impulse response of the gammatone filter bank. The output of each filter is the relative time-amplitude response and the axis labels correspond to the center frequency of the filter.
(Color online) Four different representations of the same echo. (A) Echo in the time domain. (B) Spectrogram with 512 point Hanning window. (C) Tursiogram. (D) Spectrogram with 16 point Hanning window.
(Color online) Click stimuli [(A) and (B)] and their identical spectra (C) superimposed. Note that the two clicks have identical spectra.
(Color online) (A1), (B1) the and stimuli respectively. (A2), (B2) Tursiograms from (A1) and (B1). (A3), (B3) EDM outputs of (A1) and (B1). (A4), (B4) The corresponding outputs of the spectral model.
(Color online) (A) Echo from standard cylinder. (B) Echo from cylinder. (C) Spectral content of both cylinders.
(Color online) (A1), (A2) Echoes from the standard and cylinders, respectively. (A2), (B2) Their corresponding tursiograms. (A3), (B3) The corresponding EDM outputs. (A4), (B4) The corresponding outputs of the spectral model.
Results from the cylinder wall thickness discrimination simulation.
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