- Graeme Clark Collection
Graeme Clark Collection
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ItemAuditory evoked responses to frequency and amplitude modulated soundRickards, Field W. ; Clark, Graeme M. ( 1973)Auditory evoked responses to pure tone bursts have been described in a number of studies and have been characterized by the P1, N1 and P2 components. The presence of later components, namely N2, P3 and the Contingent Negative Variation, depends largely on the cerebral processing of the stimulus. These evoked responses have been recorded using tone bursts. However, neurophysiological studies have shown that the cortex codes complex sounds. Therefore, we performed a set of acute experiments on the cat, using frequency and amplitude modulated sounds. This was reported in a previous study (Richards and Clark, 1972) which showed that similar onset and later waves could be recorded from the cortex of the cat. In some areas of the cortex the later waves were in synchrony with the modulation envelope.
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ItemSteady-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.