Sensory SystemsSensory SystemsСенсорные системы0235-00923034-5936The Russian Academy of Sciences67581310.31857/S0235009223020051QTARLNСЛУХОВАЯ СИСТЕМАForward masking of the auditory evoked potentials in a dolphin at monaural and dichotic auditory stimulation: implications for the preceding effect and biosonarПоследовательная маскировка слуховых вызванных потенциалов у дельфина при монауральной и дихотической звуковой стимуляции: значение для эффекта предшествования и биосонараSupinA. Ya.СупинА. Я.evgeniasysueva@gmail.comSysuevaE. V.СысуеваЕ. В.evgeniasysueva@gmail.comNechaevD. I.НечаевД. И.evgeniasysueva@gmail.comTarakanovM. B.ТаракановМ. Б.evgeniasysueva@gmail.comPopovV. V.ПоповВ. В.evgeniasysueva@gmail.comA.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of SciencesИнститут проблем экологии и эволюции им. А.Н. Северцова РАН0104202337216217028022025Copyright ©; 2023, Russian Academy of SciencesCopyright ©; 2023, Российская академия наук2023Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0235-0092/article/view/675813

Short-latency auditory brainstem evoked potentials (ABR) to paired sound pulses (the conditioning and test stimuli) were recorded non-invasively in a bottlenose dolphin Tursiops truncatus. The stimuli were played through transducers contacting the left and right acoustic windows at the lower jaw. Two manners of stimulation were used: monaural (the both stimuli played through one and the same transducer) and dichotic (the conditioning and test stimuli played through different transducers, contacting the left and right acoustic window). Thе conditioning and test stimuli were equal in level and duration. The inter-stimulus delay varied from 0.15 to 10 ms. At the monaural stimulation, the suppression of the test stimulus was constant at interstimulus intervals from 0.15 to 0.5 ms; at longer intervals, the test response recovered. At the dichotic stimulation, the deepest suppression of the test response appeared at an interval of 0.5 ms; the test response recovered at both shorter and longer intervals. The complete recovery appeared at intervals as short as 0.15 ms and as long as 2 ms. Implications of the found regularities for the preceding effect and biosonar is discussed.

Неинвазивно регистрировали коротколатентные слуховые вызванные потенциалы (КСВП) у бутылконосого дельфина Tursiops truncatus на парные импульсные звуковые стимулы (кондиционирующий и тестирующий), подаваемые через излучатели, контактирующие с “акустическим окном” на нижней челюсти. Использовали две формы стимуляции: монауральную (оба стимула через один излучатель), или дихотическую (кондиционирующий и тестирующий стимулы подавали через разные излучатели, контактирующие один – с правым, другой – с левым акустическим окном). Кондиционирующий и тестирующий стимулы имели одинаковые характеристики, интервал между ними варьировал от 0.15 до 10 мс. При монауральной стимуляции подавление тестирующего ответа было одинаковым в диапазоне интервалов от 0.15 до 0.5 мс; при удлинении интервала ответ восстанавливался. При дихотической стимуляции наиболее глубокое подавление тестирующего ответа происходило при интервале 0.5 мс, а при более коротких или более длительных интервалах тестирующий ответ восстанавливался. Полное восстановление происходило при укорочении интервала до 0.15 мс и удлинении до 2 мс. Обсуждается значение полученных данных для эффекта предшествования и для работы биосонара дельфинов.

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