TY - JOUR A1 - Hanslmayr, Simon A1 - Aslan, Alp A1 - Staudigl, Tobias A1 - Klimesch, Wolfgang A1 - Herrmann, Christoph S. A1 - Bäuml, Karl-Heinz T1 - Prestimulus oscillations predict visual perception performance between and within subjects JF - NeuroImage N2 - In the present study, the electrophysiological correlates of perceiving shortly presented visual stimuli are examined. In particular, we investigated the differences in the prestimulus EEG between subjects who were able to discriminate between four shortly presented stimuli (Perceivers) and subjects who were not (Non-Perceivers). Additionally, we investigated the differences between the subjects perceived and unperceived trials. The results show that Perceivers exhibited lower prestimulus alpha power than Non-Perceivers. Analysis of the prestimulus EEG between perceived and unperceived trials revealed that the perception of a stimulus is related to low phase coupling in the alpha frequency range (8–12 Hz) and high phase coupling in the beta and gamma frequency range (20–45 Hz). Single trial analyses showed that perception performance can be predicted by phase coupling in the alpha, beta and gamma frequency range. The findings indicate that synchronous oscillations in the alpha frequency band inhibit the perception of shortly presented stimuli whereas synchrony in higher frequency ranges (> 20 Hz) enhances visual perception. We conclude that alpha, beta and gamma oscillations indicate the attentional state of a subject and thus are able to predict perception performance on a single trial basis. KW - EEG KW - Oscillations KW - Prestimulus KW - Phase coupling KW - Perception KW - Alpha Y1 - 2021 UR - https://doi.org/10.1016/j.neuroimage.2007.07.011 VL - 37 IS - 4 SP - 1465 EP - 1473 ER - TY - JOUR A1 - Hanslmayr, Simon A1 - Staudigl, Tobias A1 - Aslan, Alp A1 - Bäuml, Karl-Heinz T1 - Theta oscillations predict the detrimental effects of memory retrieval JF - Cognitive, Affective, & Behavioral Neuroscience N2 - Retrieving a target item from episodic memory typically enhances later memory for the retrieved item but causes forgetting of competing irrelevant memories. This finding is termed retrieval-induced forgetting (RIF) and is assumed to be the consequence of an inhibitory mechanism resolving retrieval competition. In the present study, we examined brain oscillatory processes related to RIF, as induced by competitive memory retrieval. Contrasting a competitive with a noncompetitive retrieval condition, we found a stronger increase in early evoked theta (4–7 Hz) activity, which specifically predicted RIF, but not retrieval-induced enhancement. Within the cognitive framework of RIF, these findings suggest that theta oscillations reflect arising interference and its resolution during competitive retrieval in episodic memory. KW - Memory Retrieval KW - Electrode Site KW - Retrieval Practice KW - Competitive Condition KW - Theta Power Y1 - 2021 UR - https://doi.org/10.3758/CABN.10.3.329 VL - 10 IS - 3 SP - 329 EP - 338 ER -