Perceptual Centre correlates in Evoked Potentials
Soraghan , C. and Ward, T. and Villing, R. and Timoney, Joseph (2005) Perceptual Centre correlates in Evoked Potentials. In: 3rd European Medical and Biological Engineering Conference EMBEC'05 and IFMBE European Conference on Biomedical Engineering, 2005, Prague, Czech Republic.
Perceptual centres (p-centres) are the subjective moments of occurrence of acoustic stimuli. When sounds are perceived in synchrony or are regularly spaced, it is their p-centres which occur synchronously or are isochronous. In order to analyse or model the acoustic features which influence the p-centre, it is necessary to measure p-centres for many stimuli. However there is a problem: it is difficult for an external observer to determine the exact time at which a listener perceives a sound’s occurrence. A possible solution is to find a measurable electrophysiological correlate of the p-centre. In order to investigate this, an experiment is described which compares features of the Auditory Evoked Potential (AEP) response and p-centres for a number of speech and synthetic stimuli. The results indicate a correlation between the latency of the dominant negative peak of the AEP and the p-centre.
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