HEARING MECHANISMS IN VERTEBRATES,A CIBA FOUNDATION by A.V.S.& Knight, J.(eds.) De Reuck

By A.V.S.& Knight, J.(eds.) De Reuck

Content:
Chapter 1 Chairman's advent (page 1): Professor O. Lowenstein
Chapter 2 listening to in Fish (pages 3–17): according to S. Enger
Chapter three Evolution of the Auditory engaging in equipment in Terrestrial Vertebrates (pages 18–40): A. Tumarkin
Chapter four constitution and serve as of the Ear and of the Auditory mind components in Birds (pages 41–63): J. Schwartzkopff
Chapter five listening to in Bats (pages 65–88): J. D. Pye
Chapter 6 Ultrastructure and Peripheral Innervation development of the Receptor in terms of the 1st Coding of the Acoustic Message (pages 89–125): H. Spoendlin
Chapter 7 Cochlear constitution and listening to in guy (pages 126–142): Goran Bredberg
Chapter eight styles of job in unmarried Auditory Nerve Fibres of the Squirrel Monkey (pages 143–168): J. E. Rose, J. F. Brugge, D. J. Anderson and J. E. Hind
Chapter nine Efferent Inhibition within the Cochlea through the Olivocochlear package (pages 169–186): Jorgen Fex
Chapter 10 Orientation via Sound in Fishes (pages 187–206): H. Kleerekoper and T. Malar
Chapter eleven Localization and Lateralization of Sound in area (pages 207–233): William D. Neff
Chapter 12 position of the Pinna in Localization: Theoretical and Physiological results (pages 234–243): Dwight W. Batteau
Chapter thirteen Centrifugal keep watch over Mechanisms of the Auditory Pathway (pages 245–258): I. C. Whitfield
Chapter 14 Auditory Responses Evoked within the Human Cortex (pages 259–271): Hallowell Davis
Chapter 15 Cortical illustration (pages 272–295): E. F. Evans
Chapter sixteen ultimate dialogue (pages 296–309):
Chapter 17 Chairman's remaining comments (page 310): Professor O. Lowenstein

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The particular properties of the microphonics might be explained by nonlinear damping through the tegmentum vasculosum. The nerve component of the cochlear potentials represents the activity of the auditory nerve and its synapscs. /sec. The action potentials further show adaptation and latency changes as a function of stimulus intensity and are influenced by thc metabolic state, altogethcr very much as in mammals (Schwartzkopff, 1960). Stopp and Whitfield (1964) havc shown that summating potentials also occur in the bird’s ear.

G. inBubo). On the other hand, some species, like the pigeon, remain behind by about 20 db. It can be said that in general the threshold efficiency in birds and mammals coincides. Both groups reach the limits imposed by thermal noise. However, the area of main sensitivityis somcwhat narrower in birds than in man and other mammals. This appears to correspond to the conclusions drawn from acoustic behaviour. Only the ultrasonic overtones of the sound production are apparently not perceived and are supposed to be a by-product, as has also been concluded by Thorpe and Griffin (1961).

The various amphibian and reptilian orders all struggled with this problem with varying success. The modern prostrate Urodela (salamandcrs and newts) and Squamata (snakcs and lizards) represent groups that entirely failed to solve the problem 28 A. TUMARKIN and so have remained condemned to the prostrate habitus. The various transition groups comprise creaturcs that are still struggling with the problem with varying dcgrees of succcss. It remains to consider the means whcrcby the more progressive mcinbers FIG.

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