Differences between a successive versus simultaneous range discrimination task in an echolocating bottlenose dolphin (Tursiops truncatus).

IF 2.1 2区 物理与天体物理 Q2 ACOUSTICS
Katie A Christman, James J Finneran, Siena Merk, Jason Mulsow, Dorian S Houser, Timothy Q Gentner
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引用次数: 0

Abstract

A primary feature of bat and dolphin biosonar is the ability to measure echo-delay, both to determine absolute target range and to resolve range differences between targets. Measurements of range (i.e., echo-delay) discrimination thresholds in echolocating animals, however, vary across studies. This variance may reflect different test methods, such as whether the animal could simultaneously receive echoes from two compared targets (simultaneous condition), or only one target at a time (successive condition). The present study compares these test conditions directly in a dolphin. Dolphin echo-delay discrimination thresholds were measured under both simultaneous and successive conditions at simulated mean ranges of 3, 10, and 14 m to assess potential interactions across target range. The potential for spectral cues at various range differences under a simultaneous condition was also evaluated using a model of the dolphin peripheral auditory system. Results indicate that the availability of spectral cues during the simultaneous condition imparted limited improvement relative to the successive condition where spectral cues were unavailable. Echo-delay discrimination thresholds showed an overall increase with an increase in range in both the simultaneous and successive conditions.

蝙蝠和海豚生物声纳的一个主要特点是能够测量回声延迟,既能确定绝对目标范围,又能分辨目标之间的范围差异。然而,不同研究对回声定位动物的范围(即回声延迟)辨别阈值的测量结果各不相同。这种差异可能反映了不同的测试方法,例如动物是同时接收两个比较目标的回声(同时条件),还是每次只接收一个目标的回声(连续条件)。本研究直接在海豚身上比较了这些测试条件。在 3 米、10 米和 14 米的模拟平均距离下,分别测量了海豚在同时和连续条件下的回声-延迟分辨阈值,以评估不同目标范围内的潜在相互作用。此外,还使用海豚外周听觉系统模型评估了同时条件下不同距离差异下光谱线索的潜力。结果表明,与没有光谱线索的连续条件相比,同时条件下光谱线索的可用性提高有限。回声-延迟分辨阈值在同时和连续条件下都随着范围的增加而整体提高。
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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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