Comparative Neurology of the Telencephalon by Sven O. E. Ebbesson (auth.), Sven O. E. Ebbesson (eds.)

By Sven O. E. Ebbesson (auth.), Sven O. E. Ebbesson (eds.)

When a tender graduate scholar sat sooner than Percival Bailey in 1960 and noted his longstanding curiosity in zoology and his contemporary curiosity within the apprehensive procedure, he requested the then Director of the Illinois Neuropsychiatric Institute if there has been aid within the medical institution for learn in evolutionary comparative neurology. Bailey patted his stomach with either fingers and proposal for a second. ultimately he acknowledged: "Young guy, there's no position for individuals like you." The graduate scholar used to be crestfallen. To a wide volume what Bailey stated continues to be precise. The higher a part of examine in neurobiology is directed towards answering a unmarried extensive query. How do brains mostly, and the human mind particularly, paintings? this can be a valid and significant query. it's not, in spite of the fact that, the single query worthy answering. This overweening emphasis on functionality, specially in regard to the human fearful is as a result of the origins of neurology within the hospital. the pro tuition, procedure, web site of such a lot such learn, has been remarkably well-insulated from the various significant matters of biology.

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These investigations have utilized field situations to demonstrate that intermittendy pulsed sounds are more effective than regularly pulsed sounds in attracting sharks and that the optimal effect is obtained as mean pulse rate is increased up to 20 pulses per second. The sharks' behavior is characterized by orientation toward the transducer while still swimming in the acoustically far field, beyond the limit of visibility, and then swimming direcdy toward the sound source. Thus Nelson and Gruber (1963) claim that sharks, unlike teleosts (see van Berjeijk, 1964), possess true directional hearing and are not dependent on sound-gradient searching to localize its source.

Similarly, both Veselkin (1964) and Karamyan et ai. (1966) were unable to obtain evoked potentials in the elasmobranch telencephalon following photic stimulation or electrical stimulation of the optic nerve. B. Multimodal Representation The reign of olfaction over the elasmobranch telencephalon was initially questioned by the discovery that the bulk of the nurse shark's (Ginglymostoma cirratum) telencephalon does not receive any primary or higher-order olfactory fibers (Ebbesson and Heimer, 1970; Ebbesson, 1972a).

J. Ginglymostoma cirratum), Brain Res. 8:36. , 1971, Connections of the nurse shark's telencephalon, Science 173:254. , Jane, J. , 1972, A general overview of major interspecific variations in thalamic organization, Brain Behav. Evol. 6:92. Ebesson, S. O. , Schroeder, D. , 1975, The Golgi method and the revival of comparative neurology, in: Golgi Centennial Symposium, Proceedings (M. ), pp. 153160, Raven Press, New York. , 1901, Das Cerebellum von ScyUium canicula, Arch. Mikrosk. Anat. 58:661. , 1969, The olfactory bulb and medial hemisphere wall of the rat-fish, Chimaera, J.

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