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Synchrony of dolphin eye movements and their power density spectra

Authors
Journal
Comparative Biochemistry and Physiology Part A Physiology
0300-9629
Publisher
Elsevier
Publication Date
Volume
68
Issue
3
Identifiers
DOI: 10.1016/0300-9629(81)90074-8

Abstract

Abstract 1. 1. In the laboratory, eye movements in the horizontal and vertical planes of a normal human and two adult dolphins, Tursiops truncatus, were analyzed and compared. Several of the visual conditions included structured, unstructured and moving stimulus fields. 2. 2. Power spectral density analyses of the dolphin eye movements showed maximal power around 0.1 Hz, lower than the human counterpart. 3. 3. Coefficients of determination ( r 2) and correlation coefficients ( r) derived from autocorrelation and crosscorrelation of dolphin eye signals produced typically small values scattered randomly around zero. 4. 4. From 51,200 correlations, the greatest r 2 value indicated that movements of one dolphin eye predict no more than 30% of the movement variance of the fellow eye. 5. 5. Although dolphin eyes are mobile at lower fundamental frequencies than in humans, there is a low level of synchrony between the two eyes.

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