Interactions between perceptual and endogenous processes as reflected in slow EEG oscillations B Mathes, C Schmiedt-Fehr, K Khalaidovski, C Basar-Eroglu |
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Institute of Psychology and Cognition Research, University of Bremen, Germany
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| Interactions between stimulus-induced perceptual and endogenous processes play an important role for the high efficiency of the human brain to detect relevant information. A repeatedly reported reflection of cognitive processes in slow EEG components is their enhancement during recognition (“old-new effect”). However, we have shown that this effect is reversed under high visual load. Our study indicates that whether old-new categorisations rely on differences or similarities between the memorized and current percept, is influenced by the stimulus material. Hence, the impact of stimulus-dependent processing on endogenous cognitions modifies slow EEG components (Mathes et al., 2012, Psychophysiology, 46,920-32). Vice versa, the impact of endogenous cognitions on perception can be observed during multistable perception, during which one invariant stimulus pattern is perceived in at least two different, mutually exclusive ways. We have shown that voluntary control of holding and changing the current percept modifies slow oscillatory components during the conscious recognition of the perceptual change (Mathes et al., 2006, Neuroscience Letters, 402,145-49). Recent results further indicate topographical differences of the brain response between internally generated or exogenously applied changes of the percept. In conclusion, memory and perception are interacting and flexible, but in a context-dependent manner. |
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