Examining tactile spatial remapping using transcranial magnetic stimulation

in Seeing and Perceiving
Restricted Access
Get Access to Full Text

Have an Access Token?



Enter your access token to activate and access content online.

Please login and go to your personal user account to enter your access token.



Help

Have Institutional Access?



Access content through your institution. Any other coaching guidance?



Connect

Previous research has provided evidence for two stages of tactile processing (e.g., Azañon and Soto-Faraco, 2008; Groh and Sparks, 1996). First, tactile stimuli are represented in a somatotopic representation that does not take into account body position in space, followed by a representation of body position in external space (body posture representation, see Medina and Coslett, 2010). In order to explore potential functional and neural dissociations between these two stages of processing, we presented eight participants with TMS before and after a tactile temporal order judgment (TOJ) task (see Yamamoto and Kitazawa, 2001). Participants were tested with their hands crossed and uncrossed before and after 20 min of 1 Hz repetitive TMS (rTMS). Stimulation occurred at the left anterior intraparietal sulcus (aIPS, somatotopic representation) or left Brodmann Area 5 (BA5, body posture) during two separate sessions. We predicted that left aIPS TMS would affect a somatotopic representation of the body, and would disrupt performance in both the uncrossed and crossed conditions. However, we predicted that TMS of body posture areas (BA5) would disrupt mechanisms for updating limb position with the hands crossed, resulting in a paradoxical improvement in performance after TMS. Using thresholds derived from adaptive staircase procedures, we found that left aIPS TMS disrupted performance in the uncrossed condition. However, left BA5 TMS resulted in a significant improvement in performance with the hands crossed. We discuss these results with reference to potential dissociations of the traditional body schema.

Seeing and Perceiving

A Journal of Multisensory Science

References

AzanonE.Soto-FaracoS. (2008). Changing reference frames during the encoding of tactile events, Current Biology 18, 10441049.

GrohJ. M.SparksD. L. (1996). Saccades to somatosensory targets. 1. Behavioral characteristics, Journal of Neurophysiology 75, 412427.

MedinaJ.CoslettH. B. (2010). From maps to form to space: Touch and the body schema, Neuropsychologia 48, 645654.

YamamotoS.KitazawaS. (2001). Reversal of subjective temporal order due to arm crossing, Nature Neuroscience 4, 759765.

Information

Content Metrics

Content Metrics

All Time Past Year Past 30 Days
Abstract Views 5 5 2
Full Text Views 3 3 3
PDF Downloads 2 2 2
EPUB Downloads 0 0 0