He was told not to look at the stimulation site and to keep the stimulated hand immobile.
Cereb Cortex 17, 9 17).. Initially (100 147 ms), responses to each hand were stronger to the what than where condition in a statistically indistinguishable network within the hemisphere contralateral to the stimulated hand, arguing against hemispheric specialization as the principal basis for somatosensory what and where pathways.
However, it was found that participants accurately grasped the stimulated hand with their opposite hand at its real location, and not at the illusory location that they reported (Kammers et al., 2009).
First, we observed consistent activation in bilateral somatosensory areas, with activation being more pronounced in the right hemisphere – i.e., contralateral to the stimulated hand.
When asked to blindly point towards the stimulated hand subjects will typically point towards the rubber or virtual hand – the distance between the real hand position and the indicated position being termed "proprioceptive drift".
This stimulation caused the majority of our participants to perceive the right rubber hand as their own and to sense two distinct touches – one located on the right rubber hand and the other on their left (stimulated) hand.
We hypothesised that they would have to resemble the real stimulated hand in both laterality (e.g., both right hands) and anatomy (i.e., both arms, but not an arm and a leg).
Importantly, in the fourth of our experiments reported here, the left rubber hand condition effectively served as a control for a putative duplication of touch from the brushed left hand to any rubber hand placed 42 cm to the right of the stimulated hand.
This rubber hand illusion involves not just subjective attribution of the rubber hand to the self, but also a mis-localization of where the stimulated hand is felt to be after a few minutes or even seconds of such synchronous visuotactile stimulation.
The scalp topographies of the peak value of βInt were similar: They were maximal at the midline (Cz) and at the central electrodes contralateral to the stimulated hand (C3), and extended bilaterally toward the temporal regions.
