Depersonalized experience and multimodal processing
Poster Presentation

Noriaki Kanayama
Nagoya University, Graduate School of Environmental Studies

Atushi Sato
University of Toyama, Faculty of Human Development

Hideki Ohira
Nagoya University, Graduate School of Environmental Studies

     Abstract ID Number: 48
     Full text: Not available
     Last modified: March 15, 2006
     Presentation date: 06/20/2006 10:00 AM in Hamilton Building, Foyer
     (View Schedule)

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)