TAILIEUCHUNG - Cochlear Implants: Fundamentals and Application - part 4

Dân số câu trả lời. Một loạt các phản ứng não điện gợi (EABRs) được sản xuất bởi một lưỡng cực điện cực kích thích 1 gần bức tường bên trong của Scala nhĩ của mèo và ghi lại khác biệt với các điện cực kim da đầu dưới da. Biên độ của sóng âm mưu từ tăng cấp độ hiện tại 0,2-1,6 mA (In lại từ Shepherd et al. 1993, với sự cho phép của Elsevier.) | Auditory Physiology 223 Stimulus current mA Figure . Population responses. A series of electrically evoked brainstem responses EABRs produced by a bipolar 1 stimulating electrode close to the inner wall of the scala tympani of the cat and recorded differentially with subcutaneous scalp needle electrodes. The amplitude of the waves is plotted from increases in current level from to mA Reprinted from Shepherd et al. 1993 with permission from Elsevier. high frequencies into the excitatory area of the unit produced a roughly sinusoidal distribution of discharge rates. A small number of units however in the DCN produced asymmetrical responses Erulkar et al 1968 Moller 1971 . This was due to the asymmetry of the inhibitory side bands. At higher modulation rates 50-300 Hz the bandwidth of the unit s response area becomes narrower. Therefore at the first auditory nucleus there are cells that demonstrate some selectivity in their response to modulated sounds. This becomes much more marked in the higher levels of the auditory system particularly in the AC where there are units that are very specific in their sensitivities to the direction and depth of modulation Bogdanski and Galambos 1960 Suga 1963 1965 Evans and Whitfield 1964 . Phillips and Hall 1987 discovered units responsive not only to amplitude modulated AM tones but also to the rate of change and the base sound intensity level. The response could be explained from the inhibitory side bands for the unit. As the sound level increased it excited the neighboring area with a suppression of the response. Whitfield and Evans 1965 also showed that certain cortical cells responded to frequency modulated FM tones and not to pure tones and the response was directionally selective. Furthermore in the AC the tuning curves were found by Oonishi and Katsuki 1965 to vary in shape from flat through irregular and multipeaked to sharp. This 224 5. Electrophysiology would indicate multifrequency input and more complex .

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• An introduction to the physiology of hearing
• The auditory cortex
• The centrifugal pathways
• Sensorineural hearing loss
• Physiological aspects of the cochlear prosthesis
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• Neck surgery
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• Cochlear biophysics
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