Depersonalized experience and multimodal processing

Noriaki Kanayama, Nagoya University, Graduate School of Environmental Studies

Abstract
Depersonalized experience, the feeling that own proprioception was received not at own body, was reported with the traumatic event or Dissociative Disorder. In nonclinical populations, temporary depersonalized experiences were frequently seen. It could be hypothesized that this experience was caused by the disintegration of somatosensory and visual perception. In this study, we investigated the differences in the integration of multimodal perception between the groups with high and low frequent depersonalized experiences. According to rubber hand experience method (Pavani et al., 2000), participants were required to locate the somatosensory stimuli by the vibration motors, seeing the distracting visual stimuli by the LED to rubber hand. Reaction time (RT) and electroencephalogram data was analyzed. In this study, congruency effect for RT was divided two components; the promotion by the congruent stimulation and the inhibition by the incongruent stimulation. In the results, inhibition component was modulated by the frequency of the depersonalized experience. For EEG data, the outstanding power increase in the congruent condition was observed in high beta band response (25-30Hz) in 250-300 ms at parietal regions. Moreover, this component was synchronized in a whole brain for the populations which have the frequent depersonalized experiences compared with the control group. (198 words)

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