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Cloettapreis_2012_Nr_40

21 Figure 3A: Brain mechanisms of self-identification Location of brain activity during experimentally- and neurologically-induced changes in self-identification. Note the involvement of premotor cortex (PMC, brown), primary somato­ sensory cortex (S1), posterior parietal cortex (IPS, purple), the temporo-parietal and the occipito-temporal cortex of both hemispheres. The location of the small circles indicates location of brain activation in different brain imaging studies (reproduced with permission from Blanke, 2012). cation in both groups25 . These data show that self-location depends on visuo-tactile stimulation and on the experienced direction of the first-per- son perspective and that different multisensory mechanisms underlie self- location versus self-identification (the latter was independent on the first- person perspective). Changes in self-location and the first-person perspective were reflected in activity at the TPJ bilaterally25 , peaking in the posterior superior temporal gyri (Figure 3B). Based on these findings it has been argued that self-location and the first- person perspective may be caused by visuo-vestibular mechanisms, be- cause in the study by Ionta et al.25 participants viewed a visual image on the HMD that contained a conflict between the visual gravitational cues of the virtual body and the vestibular gravitational cues of the partici- pant’s physical body. Blanke (2012) argued that this probably caused the observed differences in the experienced direction of the first-person ­perspective, with participants from the Up-group relying more strongly on vestibular cues from the physical body (indicating downward gravity directed towards the physical body) than on visual gravitational cues from the virtual body (indicating downward gravity directed away from the physical body), whereas participants from the Down-group show the ­opposite pattern. This is compatible with interindividual differences

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