Ambient noise induces independent shifts in call frequency and amplitude within the Lombard effect in echolocating bats

Hage S.R.; Jiang T.; Berquist S.W.Feng J.Metzner W.

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Ambient noise induces independent shifts in call frequency and amplitude within the Lombard effect in echolocating bats

机译：Ambient noise induces independent shifts in call frequency and amplitude within the Lombard effect in echolocating bats

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The Lombard effect, an involuntary rise in call amplitude in response to masking ambient noise, represents one of the most efficient mechanisms to optimize signal-to-noise ratio. The Lombard effect occurs in birds and mammals, including humans, and is often associated with several other vocal changes, such as call frequency and duration. Most studies, however, have focused on noisedependent changes in call amplitude. It is therefore still largely unknown how the adaptive changes in call amplitude relate to associated vocal changes such as frequency shifts, how the underlying mechanisms are linked, and if auditory feedback from the changing vocal output is needed. Here, we examined the Lombard effect and the associated changes in call frequency in a highly vocal mammal, echolocating horseshoe bats.Weanalyzed howbandpassfiltered noise (BFN; bandwidth 20 kHz) affected their echolocation behavior when BFN was centered on different frequencies within their hearing range. Call amplitudes increased only when BFN was centered on the dominant frequency component of the bats' calls. In contrast, call frequencies increased for all but one BFN center frequency tested. Both amplitude and frequency rises were extremely fast and occurred in the first call uttered after noise onset, suggesting that no auditory feedback was required. The different effects that varying the BFN center frequency had on amplitude and frequency rises indicate different neural circuits and/or mechanisms underlying these changes.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第10期|4063-4068|共6页
作者
Hage S.R.; Jiang T.; Berquist S.W.Feng J.Metzner W.;
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作者单位

Department of Integrative Biology and Physiology, University of California, Los Angeles, CA 90095, United States;

Jilin Key Laboratory of Animal Resource Conservation and Utilization, Northeast Normal University, Changchun 130024, Jilin, China;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Acoustic communication; Audiovocal integration; Lombard speech; Signal masking; Vocalization;

Ambient noise induces independent shifts in call frequency and amplitude within the Lombard effect in echolocating bats

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