Die Ohrbewegungen der Hufeisenflederm�use (Chiroptera, Rhinolophidae) und der Mechanismus des Bildh�rens

Schneider, Hans; Möhres, Franz Peter

doi:10.1007/bf00297861

Cited by 54 publications

(49 citation statements)

References 13 publications

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“…Furthermore, bats with bilaterally immobilized ears showed compensating head movements. These results by Schneider and Mö hres (1960) support the hypothesis that Rhinolophus might compensate the lack of the spectral notch in the HRTF by ear movements in a way that the ear movements create additional binaural cues. As the localization acuity was not much impaired by immobilizing only one ear, one can suppose that alternating the position of only one ear creates enough binaural differences to localize a target.…”

Section: Functional Implicationssupporting

confidence: 79%

“…This holds especially true for Rhinolophus with distinct back and forth directed ear movements closely correlated to sound emission (Schneider and Mö hres, 1960;Griffin et al, 1962). The pattern of ear movements in Pteronotus, however, is slower and non alternating (Schnitzler, 1970).…”

Section: Functional Implicationsmentioning

confidence: 89%

“…The pattern of ear movements in Pteronotus, however, is slower and non alternating (Schnitzler, 1970). It was shown by Schneider and Mö hres (1960) that unilateral immobilization of the pinna of R. ferrumequinum only slightly diminishes the ability to detect a target, whereas target detection in elevation was considerably impaired when both pinnae where immobilized. Furthermore, bats with bilaterally immobilized ears showed compensating head movements.…”

Section: Functional Implicationsmentioning

confidence: 95%

See 2 more Smart Citations

Directionality of hearing in two CF/FM bats, Pteronotus parnellii and Rhinolophus rouxi

Firzlaff

Schuller

2004

Hearing Research

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Section: Functional Implicationssupporting

confidence: 79%

Section: Functional Implicationsmentioning

confidence: 89%

Section: Functional Implicationsmentioning

confidence: 95%

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Directionality of hearing in two CF/FM bats, Pteronotus parnellii and Rhinolophus rouxi

Firzlaff

Schuller

2004

Hearing Research

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“…HDC bats-and horseshoe bats in particular-have long been known for their conspicuous pinna movements [18,19], and early anatomical work [18] has demonstrated the presence of specialized muscular actuation mechanisms that enable them. Experimental results have demonstrated that immobilizing the pinnae of these bats degrades target localization in the vertical direction [20].…”

mentioning

confidence: 99%

Ear Deformations Give Bats a Physical Mechanism for Fast Adaptation of Ultrasonic Beam Patterns

Gao

Balakrishnan

et al. 2011

Phys. Rev. Lett.

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A large number of mammals, including humans, have intricate outer ear shapes that diffract incoming sound in a direction-and frequency-specific manner. Through this physical process, the outer ear shapes encode sound-source information into the sensory signals from each ear. Our results show that horseshoe bats could dynamically control these diffraction processes through fast nonrigid ear deformations. The bats' ear shapes can alter between extreme configurations in about 100 ms and thereby change their acoustic properties in ways that would suit different acoustic sensing tasks.

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“…These shape changes are driven by specialized musculatures (Schneider and Möhres 1960;Schneider 1961;Göbbel 2002) and are known to occur during pulse emission (for the noseleaf (Feng et al2012;He et al 2015)) or echo reception (for the pinnae (Yin et al 2015)). Noseleaf and pinna motions are fast and occur on a similar time scale as the durations of the biosonar pulses and echoes (Gao et al 2011;Feng et al 2012;He et al 2015).…”

Section: Dynamic Information Encoding: Noseleaf and Pinna Motionsmentioning

confidence: 99%

Quantitative approaches to sensory information encoding by bat noseleaves and pinnae

Müller

2018

Can. J. Zool.

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The biosonar systems of horseshoe bats (Rhinolophidae) and Old World round leaf-nosed bats (Hipposideridae) incorporate a pervasive dynamic at the interfaces for ultrasound emission (noseleaves) and reception (pinnae). Changes in the shapes of these structures alter the acoustic characteristics of the biosonar system and could hence influence the encoding of sensory information. The focus of the present work is on approaches that can be used to investigate the hypothesis that the interface dynamic effects sensory information encoding. Mutual information can be used as a metric to quantify the extent to which the different ultrasonic emission and reception characteristics (beampatterns) provide independent views of the environment. Two different quantitative approaches have been taken to evaluate the relationship between dynamically encoded additional sensory information and sensing performance in finding the direction of a biosonar target. The first approach is to determine an upper bound on the number of different directions that can be distinguished by virtue of distinct spectral signatures. The second approach is based on a lower bound (Cramér–Rao) on the variance of direction estimates. All these different metrics demonstrate that the peripheral dynamics seen in bats result in the encoding of additional sensory information that is suitable for enhancing biosonar performance.

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Die Ohrbewegungen der Hufeisenflederm�use (Chiroptera, Rhinolophidae) und der Mechanismus des Bildh�rens

Cited by 54 publications

References 13 publications

Directionality of hearing in two CF/FM bats, Pteronotus parnellii and Rhinolophus rouxi

Directionality of hearing in two CF/FM bats, Pteronotus parnellii and Rhinolophus rouxi

Ear Deformations Give Bats a Physical Mechanism for Fast Adaptation of Ultrasonic Beam Patterns

Quantitative approaches to sensory information encoding by bat noseleaves and pinnae

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