Volume 29 #1

Contents

1. To the problem of neuronal firing correlation between neurons located in the auditory pathway (Analitic review)
2. Wiring of retinal direction-selective ganglion cells. Review
3. Recognition of projectively transformed planar figures. VIII. On computation of the ensemble of correspondence for “rotationally symmetric” ovals
4. The differences in the neuronal metabolic activity in eye-specific layers of the dorsal lateral geniculate nucleus in cats with altered binocular vision
5. The influence of masker on the hearing sensitivity to the dynamic changes in sound spectrum depending on masker-to-signal intensity ratio
6. Sensitivity of various areas of the head of a beluga to acoustical stimulation: Checking the hypotheses of sound conduction in odontocetes
7. Biosensor test-system for determination of the physiological heparin concentrations

In the beluga whale (Delphinapterus leucas), an attempt was made to test the hypotheses of sound conduction. A method of underwater contact stimulation in conjunction with non-invasive auditory evoked potentials (AEP) technique was explored. Series of tonal pips of widely varying frequencies (from 8 to 128 kHz) were used as stimuli. Hearing thresholds were determined based on the rhythmic rate following response. Verification of the mandibular, gullar and multi-channel sound transmission hypotheses revealed areas which effectively conducted sound stimuli. The areas were located at a distance of 6 to 18 cm caudally of the end of the rostrum. Maximal sensitivity was shown at a region of the lower jaw, thus confirms the mandibular hypothesis. Gullar area was recognized as a minimally sensitive.

Key words: hearing, toothed whales, evoked potentials, sound transmission

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