Laboratory Studies on Verbal Communication of Toothed Whales

Ivanov M. P., Rodionov A. A., Tolmachev Y. A., Leonova L. E., Romanovskaya E. V., Stefanov V. E.

Verbal behavior of beluga whale Delphinapterus leucas acoustic ally stimulated by noise-like signal during demonstration of video images was studied. Video images were shown by an underwater monitor and acoustic stimuli were transmitted by a speaker in the frequency range up to 18 kHz. Characteristics of acoustic stimuli are presented. Demonstration of acoustic ally accompanied video images to the animal was shown to stimulate acoustic response of with a latent period of 0.5 to 1.2 seconds. Detailed acoustic response reaction of 16 s duration, consisting of 14 packages of high-frequency impulses is presented. Also presented are packages with a stable temporal structure: one package of the first type with a modulation coefficient of 0.175 ± 0.025; one package of second type with a modulation coefficient of 0.91 ± 0.03 and mixed packages consisting of two packages of the first type and other two of the first and second type packages. The conducted series of experiments clearly indicate that the acoustic reaction of the Dolphin can be interpreted as a verbal response to the video and acoustic impact.

Download original text