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Interaural forward masking in the auditory system of a dolphin

© 2022 V. V. Popov, D. I. Nechaev, A. Ya. Supin, E. V. Sysueva

Institute of Ecology and Evolution, RAS 119071 Moscow, Leninsky Prospect, 33, Russia

Received 17 Mar 2022

The time of release of auditory brainstem responses (ABRs) from forward masking was measured in a bottlenose dolphin Tursiops truncatus using two manners of contact stimulation by tone pips: (i) the sources of the conditioning and test stimuli were positioned at one side of the head (the unilateral stimulation) and (ii) the sources were positioned at opposite sides of the head (the bilateral stimulation). In both cases, the test response was substantially suppressed at interstimulus intervals shorter than 1 ms. The test response entirely released from masking at intervals of 5 ms or longer. It is suggested that the effects of forward masking appear mostly in binaural auditory structures where signals from the two cochleae interact.

Key words: Cetacea, binaural hearing, forward masking

DOI: 10.31857/S0235009222030064

Cite: Popov V. V., Nechaev D. I., Supin A. Ya., Sysueva E. V. Interauralnaya posledovatelnaya maskirovka v slukhovoi sisteme delfina [Interaural forward masking in the auditory system of a dolphin]. Sensornye sistemy [Sensory systems]. 2022. V. 36(3). P. 244–251 (in Russian). doi: 10.31857/S0235009222030064


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