scholarly journals Forward masking in a bottlenose dolphin Tursiops truncatus : Dependence on azimuthal positions of the masker and test sources

2022 ◽  
Author(s):  
Vladimir Popov ◽  
Dmitry Nechaev ◽  
Alexander Ya. Supin ◽  
Evgeniya Sysueva
Keyword(s):  
Auditory System ◽  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Auditory Evoked Potentials ◽  
Forward Masking ◽  
Source Position ◽  
Sound Sources ◽  
Head Surface ◽  
Release From Masking ◽  
Lateral Head

Forward masking was investigated by the auditory evoked potentials (AEP) method in a bottlenose dolphin Tursiops truncatus using stimulation by two successive acoustic pulses (the masker and test) projected from spatially separated sources. The positions of the two sound sources either coincided with or were symmetrical relative to the head axis at azimuths from 0 to ±90°. AEPs were recorded either from the vertex or from the lateral head surface next to the auditory meatus. In the last case, the test source was ipsilateral to the recording side, whereas the masker source was either ipsi- or contralateral. For lateral recording, AEP release from masking (recovery) was slower for the ipsi- than for the contralateral masker source position. For vertex recording, AEP recovery was equal both for the coinciding positions of the masker and test sources and for their symmetrical positions relative to the head axis. The data indicate that at higher levels of the auditory system of the dolphin, binaural convergence makes the forward masking nearly equal for ipsi- and contralateral positions of the masker and test.

Spatial release from masking in a bottlenose dolphin Tursiops truncatus

2020 ◽  
Vol 147 (3) ◽  
pp. 1719-1726 ◽  
Author(s):  
Vladimir V. Popov ◽  
Alexander Ya. Supin ◽  
Alisa P. Gvozdeva ◽  
Dmitry I. Nechaev ◽  
Mikhail B. Tarakanov ◽  
...  
Keyword(s):  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Spatial Release ◽  
Release From Masking

Estimating bottlenose dolphin (Tursiops truncatus) hearing thresholds from single and multiple simultaneous auditory evoked potentials

2008 ◽  
Vol 123 (1) ◽  
pp. 542-551 ◽  
Author(s):  
James J. Finneran ◽  
Dorian S. Houser ◽  
Dave Blasko ◽  
Christie Hicks ◽  
Jim Hudson ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Bottlenose Dolphin ◽  
Tursiops Truncatus ◽  
Auditory Evoked Potentials ◽  
Hearing Thresholds

New possibility for measuring the cortical auditory evoked potentials: the HEARLab

2014 ◽  
Vol 155 (38) ◽  
pp. 1524-1529
Author(s):  
Ádám Bach ◽  
Ferenc Tóth ◽  
Vera Matievics ◽  
József Géza Kiss ◽  
József Jóri ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Evoked Potentials ◽  
Auditory System ◽  
Hearing Aids ◽  
Pure Tone ◽  
Auditory Evoked Potentials ◽  
Normal Hearing ◽  
Speech Stimuli ◽  
Novel Method ◽  
Cortical Auditory Evoked Potentials

Introduction: Cortical auditory evoked potentials can provide objective information about the highest level of the auditory system. Aim: The purpose of the authors was to introduce a new tool, the “HEARLab” which can be routinely used in clinical practice for the measurement of the cortical auditory evoked potentials. In addition, they wanted to establish standards of the analyzed parameters in subjects with normal hearing. Method: 25 adults with normal hearing were tested with speech stimuli, and frequency specific examinations were performed utilizing pure tone stimuli. Results: The findings regarding the latency and amplitude analyses of the evoked potentials confirm previously published results of this novel method. Conclusions: The HEARLAb can be a great help when performance of the conventional audiological examinations is complicated. The examination can be performed in uncooperative subjects even in the presence of hearing aids. The test is frequency specific and does not require anesthesia. Orv. Hetil., 2014, 155(38), 1524–1529.

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