Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10458749 | Consciousness and Cognition | 2009 | 7 Pages |
Abstract
Power density spectra and phase synchrony measurements were taken from intracranial electrode grids implanted in epileptic subjects. Comparisons were made between data from the waking state and from the period of unconsciousness immediately following a generalised tonic-clonic seizure. Power spectra in the waking state resembled coloured noise. Power spectra in the unconscious state resembled coloured noise from 1 to about 5Â Hz, but at higher frequencies changed in two out of three subjects to resemble white noise. This boosted unconscious gamma power to a higher level than conscious gamma power. For both gamma and beta passbands, synchrony measurements showed more widespread phase synchrony in the unconscious than the conscious state. We conclude that neither gamma activity per se nor phase synchrony per se are neural correlates of consciousness.
Related Topics
Life Sciences
Neuroscience
Cognitive Neuroscience
Authors
Susan Pockett, Mark D. Holmes,