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Don Jewett

Orthopaedic Surgery, University of California San Francisco, USA


Monday 4 September 2006, 15:00

Seminar Room B10 (Basement)

Alexandra House, 17 Queen Square, London, WC1N 3AR


A bridge between single-unit-activity and subjective sensation by means of a new recording technique that detects overlapped oscillations from neuronal populations


It is now possible to detect population evoked-responses from scalp electrodes even when the responses overlap in time due to rapid stimulation rates.


The method (QSD = q-sequence deconvolution), when applied to human evoked responses in visual,auditory, and somatosensory systems show repetitive oscillations at alpha frequencesin response to every stimulus.  In some cases the oscillations last for 800 ms, despite stimulus repetition every 25 ms.


The intellectual bridge will be explained:

SUA---LFP---QSD-waves---Psychophysical effects.