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Abstract:
Abstract: The present study investigates the cortical
activity leading up to, during and following spontaneous,
self-paced button pushes. Past studies (Deeke & Kornhuber 1969,
Libet 1985, etc.) have shown that self-paced button pressing is
preceded by slow negative shifts in potential (the bereitschafts or
readiness potential) recorded by scalp electrodes contralateral to
the hand that is pushing the button. In this study, we recorded
scalp potential data from several subjects during a self-paced
button-pressing paradigm using a dense array of 129 electrodes
geodesically tessellated over the head. Data from individual
subjects was averaged, and average-referenced. We performed dipole
analysis on the data, constrained to a boundary element model of
the individual subject9s MRI image. This allowed us to highlight
various events in motor and non-motor cortex that occur in the
moments leading up to, and following a spontaneous button
press.
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