Download The Auditory Midbrain: Structure and Function in the Central by Lindsay Aitkin PDF

By Lindsay Aitkin

Scientific investigations of a descriptive nature contain in­ creasingly subtle definitions of an issue. an concept is trans­ shaped after preliminary experiments right into a operating speculation that has a few testable effects. infrequently within the neurosci­ ences do such exams thoroughly falsify the speculation; on the whole they bring about a converted, extra basic speculation. one can argue that during order to outline a systematic challenge, one needs to first realize it. This monograph is an try to draw jointly wisdom and realizing from numerous disciplines, accrued from experiences performed over greater than eighty 12 months, of the capabilities of the auditory midbrain. This a part of the mind has been of constant curiosity to me, from my days as a postgraduate scholar within the mid-1960s to the current time, simply because such a lot of principles approximately imperative auditory association and serve as have constructed from experiences of this quarter. This publication is devoted to Jerzy E. Rose, Professor Emer­ itus of Neurophysiology on the college of Wisconsin. His mind and readability of brain were liable for the various glossy principles of auditory neurophysiology. those rules were integrated right into a sequence of vintage papers on audi­ tory neuroscience that might be vital for a very long time to corne. additionally, Jerzy Rose has been an encouraged instructor whose precepts of mind constitution and serve as were an important impact on his scholars, together with the author.

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Extra info for The Auditory Midbrain: Structure and Function in the Central Auditory Pathway

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8B) and, further ventrocaudally, a compact rounded nucleus (ventral nucleus). , 1981) with the dorsal nucleus resembling the central nucleus of the inferior colliculus, and the ventral nucleus more akin to pontine auditory nuclei, such as the medial nucleus of the trapezoid body or the periolivary complex (see Chapters 7 and 8). The dorsal and ventral nuclei are separated by a scattered group of neurons lying along the lateral lemniscus whose properties form a bridge between those of the dorsal and ventral nuclei.

Lesions of the superior colliculus or brachium of the inferior colliculus lengthened the latency, but otherwise had little effect on the response. Thompson and Masterton concluded that the direction of the orienting movement depends on pathways ascending to the auditory midbrain, but not beyond it, whereas the accuracy of the response depends on the inferior colliculus and nonlemniscal pathways beyond the inferior colliculus. They suggested Chapter 3 30 that the dorsal acoustic striae may be most important in the initiation of the orienting response to novel stimuli.

This cat was unable to locate correctly sound sources originating from speakers positioned 60 and 90° contralateral, and was still only 50% accurate when sounds originated from the median plane (Fig. 7B). For this cat, localization acuity was dramatically reduced in the contralateral hemifield, but still below normal between 0 and 60° ipsilateral to the lesion (Fig. 7B). The usual form taken by a deficit was a tendency to go to adjacent speakers rather than the correct source. In the case illustrated in Fig.

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