Graeme Clark Collection

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http://hdl.handle.net/11343/375

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1992 - 1997 2
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Author: COHEN, LAWRENCE × End date: 1999 × Start date: 1990 × Type: Conference Item × Subject: otology ×

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    Psychophysics and speech perception with a premodiolar electrode array
    Cohen, Lawrence T. ; Clark, Graeme M. ( 1997)
    A perimodiolar electrode array, designed to lie closer to the modiolus than the standard Coclear Limited array and developed by the Cooperative Research Centre for Cochlear Implant, Speech and Hearing Research in conjunction with Cochlear Limited, has recently been implanted in an adult patient. While excellent speech results have been obtained using the standard array, it is hypothesised that the improved place coding expected from an array lying closer to the modiolus would result in improved speech perception. Analysis of a modified Stenvers view X-ray revealed that the most apical electrode was inserted to an angle of 311 0 and that the apical half of the array was considerably closer to the modiolus than would have been the case for a standard array. Thresholds and comfortable levels were correlated with the lateral position of the stimulated electrode in the scala tympani, being much reduced for the apical electrodes. Forward masking and electrode discrimination are being measured in order to study the spread of neural excitation and the distinctness of percepts for different electrodes.
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    Steady-state evoked potentials (SSEPS): an accurate, automated, frequency specific method for objectively assessing hearing thresholds [Abstract]
    Burton, Martin J. ; Rance, G. ; Rickards, Field W. ; Cohen, L. T. ; Clark, Graeme M. ( 1992)
    The determination of hearing thresholds in young children and some adults is impossible using conventional behavioural audiometry. The development of objective methods of assessment for use in such patients is highly desirable.