Mu and alpha oscillations (8 - 12 Hz) are the most prominent electroencephalographs rhythms observed in awake, relaxed subjects. Different cortical sources may participate in these oscillations and appear to be modulated by the sensorimotor context and functional demands. In microgravity, the marked reduction in multimodal graviceptive inputs to cortical networks participating in the representation of space could be expected to affect these spontaneous rhythms. The authors report the results of an experiment conducted over the course of 3 spaceflights, in which they quantified the power of the mu and alpha rhythms in relation to the arrest reaction (i.e. in 2 distinct physiological states: eyes open and eyes closed). They observed that the power of the spontaneous mu and alpha rhythms recorded in the eyes-closed state in the sensorimotor areas (mu rhythm) and in the parieto-occipital cortex (alpha rhythm) increased in microgravity. The suppression coefficient produced by eye-opening/closure state transition also increased in microgravity. These results are discussed in terms of current theories on the source and the physiological significance of these EEG rhythms.
Mu and alpha EEG rhythms during the arrest reaction in microgravity
Mu und alpha EEG-Rhythmen während der Arrestreaktion im Zustand der Mikrogravität
Microgravity Science and Technology ; 19 , 5/6 ; 102-107
2007
6 Seiten, 2 Bilder, 2 Tabellen, 31 Quellen
Aufsatz (Zeitschrift)
Englisch
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