New PDF release: Comparative Hearing: Insects

By Ronald R. Hoy (auth.), Ronald R. Hoy, Arthur N. Popper, Richard R. Fay (eds.)

ISBN-10: 1461205859

ISBN-13: 9781461205852

ISBN-10: 1461268281

ISBN-13: 9781461268284

The Springer instruction manual of Auditory study offers a chain of compre­ hensive and artificial reports of the elemental subject matters in sleek auditory study. The volumes are geared toward all people with pursuits in listening to learn, together with complex graduate scholars, postdoctoral researchers, and scientific investigators. The volumes are meant to introduce new in­ vestigators to big points of listening to technological know-how and to aid verified investigators to higher comprehend the basic theories and knowledge in fields of listening to that they won't often keep on with heavily. each one quantity is meant to offer a selected subject comprehensively, and every bankruptcy serves as a man-made evaluate and consultant to the literature. As such, the chapters current neither exhaustive facts studies nor unique study that has no longer but seemed in peer-reviewed journals. The volumes specialise in issues that experience constructed an effective info and conceptual origin, instead of on these for which a literature is just commencing to enhance. New study parts should be lined on a well timed foundation within the sequence as they start to mature.

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Extra resources for Comparative Hearing: Insects

Sample text

Animals need sensitive ears with "useful" directional patterns. Directional patterns that emphasize ipsilateral sounds (Fig. 3C) can be processed by means of a few neurons in the central nervous system, and such patterns are thus much more useful for small animals than, for example, figure-eight patterns. The existence of an anatomical air space guiding sound to the inner surface of the tympanum is a necessary prerequisite, but it does not automatically create a very directional pressure-difference receiver.

5). Small sound transmissions may thus have significant effects at frequencies at which the diffraction effects are large. The absence of a "shadow" (at the side contralateral to the sound source) in the small grasshopper means that the sound pressures at the ear at ipsilateral and contralateral directions of sound incidence only differ by a factor of about 2 (6dB), even at 15kHz (Fig. 5B). In contrast, the ratio is about 5 (14dB) at 12kHz in the locust (Fig. 5A). The directional hearing 40 Axel Michelsen 5kHz 10dS 5 dB 0" \ \ 270" ~ 90" 1800 10 dB 12 kHz 5 dB 270" / .

If the distance from the center of a directional diagram indicates the magnitude of the driving force acting on the receiver, then the directional diagram of a small pressure receiver is circular (Fig. 3A), whereas for a small pressure gradient receiver it is a figure eight (Fig. 3B). A cardioid directivity pattern (Fig. 3C) can be obtained if the sound does not have equal access to the two surfaces. This is the pattern commonly found in insects (see Section 6). The wavelength is very important when one is dealing with the interaction between sound and solid structures.

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Comparative Hearing: Insects by Ronald R. Hoy (auth.), Ronald R. Hoy, Arthur N. Popper, Richard R. Fay (eds.)


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