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      The role of gamma band oscillations and synchrony on rubber hand illusion and crossmodal integration.

      Brain and Cognition
      Adolescent, Adult, Analysis of Variance, Brain, physiology, Electroencephalography, Female, Hand, Humans, Illusions, psychology, Male, Reaction Time, Touch Perception, Visual Perception, Young Adult

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          Abstract

          The rubber hand illusion represents an illusory experience during the mislocalization of own hand when correlated visuotactile stimuli are presented to the actual and fake hands. The visuotactile integration process appears to cause this illusion; the corresponding brain activity was revealed in many studies. In this study, we investigated the effect of the rubber hand illusion on the crossmodal integration process by measuring EEG. The participants who experienced less intensive illusion showed greater congruency effect on reaction time (RT), greater power increase at the parietal zero electrode (Pz) and smaller interelectrode synchrony of the gamma band activity. On the other hand, the participants who experienced more intense illusion showed greater interelectrode synchrony. The results suggested that the gamma band activity in the parietal area reflects the visuotactile integration process and that its synchrony causes the illusory intensity.

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