Dissociation of the functional relevance of different pre-stimulus oscillatory activity for memory formation.

摘要: The state of a neural assembly preceding an incoming stimulus modulates the processing that subsequently presented stimuli. For human memory formation, role oscillatory brain activity within different frequency ranges has been discussed but more functional relation could not be established. In present Experiment I, increase pre-stimulus theta- (3-7Hz) and beta- (13-17Hz) band oscillations during encoding for later remembered stimuli was observed. To establish direct relation, we adopted novel brain-computer-interface (BCI) method to selectively detect in real-time combined with adaptive presentation at levels activity. Therefore, second experiment BCI used visual high temporal resolution directly defined states or theta-band quality subsequent assessed behavioral level surprise recognition task. Results revealed variation performance amount oscillations, suggesting relevance beta-band encoding. Thus, enabled differentiation effective ongoing