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Echolocation Calls and Neurophysiological Correlations with Auditory Response Properties in the Inferior Colliculus of Pipistrellus abramus (Microchiroptera: Vespertilionidae)
, 2007
"... Echolocation calls and neurophysiological correlations with auditory response properties in the inferior colliculus of Pipistrellus abramus (Microchiroptera: Vespertilionidae). Zoological Studies 46(4): xxx-xxx. The present study examines the echolocation calls and auditory responses of single neuro ..."
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Echolocation calls and neurophysiological correlations with auditory response properties in the inferior colliculus of Pipistrellus abramus (Microchiroptera: Vespertilionidae). Zoological Studies 46(4): xxx-xxx. The present study examines the echolocation calls and auditory responses of single neurons in the inferior colliculus (IC) of Pipistrellus abramus (Microchiroptera: Vespertilionidae). The data showed that there was a neurophysiological correlation of the auditory response properties with echolocation calls in IC neurons. The echolocation calls of P. abramus were broad-band swept from 86.6 to 43.2 kHz. The ending frequencies of the 1st harmonics which centered around 40 (average, 43.2; range, 37.0-47.0) kHz, were relatively more stable than the initial high frequencies. The average peak frequency was 52.1 (range, 43.3-57.6) kHz of which the majority (81%, 154 of 190 calls) ranged from 50.1 to 60 kHz. We recorded the responses of 75 single IC neurons to pure tones. Most IC neurons had the best frequency (BF) at between 30
Humpback Whale Song or Humpback Whale Sonar? A Reply to Au et al.
"... Abstract—Au and colleagues ’ arguments against the hypothesis that humpback whale songs function as long-range sonar are based on questionable assumptions rather than on empirical data. Like other echolocating mammals (e.g., bats), singing humpback whales: 1) localize targets in the absence of visua ..."
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Abstract—Au and colleagues ’ arguments against the hypothesis that humpback whale songs function as long-range sonar are based on questionable assumptions rather than on empirical data. Like other echolocating mammals (e.g., bats), singing humpback whales: 1) localize targets in the absence of visual information; 2) possess a highly innervated peripheral auditory system; and 3) modulate the temporal and spectral features of their sounds based on environmental conditions. The sonar equation is inadequate for determining whether humpback whale songs generate detectable echoes from other whales because it does not account for temporal variables that can strongly affect the detectability of echoes. In particular, the sonar equation ignores the fact that much of the noise encountered by singing humpback whales is spectrally and temporally predictable, and that audition in mammals is a dynamic and plastic process. Experiments are needed to test the hypothesis that singing humpback whales listen for and respond to echoes generated by their songs. Index Terms—Baleen whale, cetacean, environmentally-adaptive sonar, low-frequency sonar, mysticete.
Recurring patterns in the songs of humpback whales (Megaptera novaeangliae)
"... This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or sel ..."
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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit:
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, 2007
"... Echolocating bats navigate and hunt insects by utilizing a biosonar system which includes vocalization and auditory systems. Many parts of the bat s auditory system are specialized for encoding and analyzing echoes from targets (Pollak and Casseday 1989, Covey 2005). By analyzing the temporal and sp ..."
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Echolocating bats navigate and hunt insects by utilizing a biosonar system which includes vocalization and auditory systems. Many parts of the bat s auditory system are specialized for encoding and analyzing echoes from targets (Pollak and Casseday 1989, Covey 2005). By analyzing the temporal and spectral cues of the echoes, bats can extract target information such as the size, shape, and texture of a tiny insect (Altringham 1996). During echolocation, the calls emitted by dif-ferent species of bat vary in frequency and tempo-ral patterns (Kössl et al. 1999). Different species of echolocating bats can be identified by their echolocation calls. Based on the frequency and temporal patterns of the emitted calls, bats can be broadly divided into 3 categories, the frequency-modulated (FM), constant-frequency (CF)/FM, and
