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Far Space Remapping by Tool Use: A rTMS Study Over the Right Posterior Parietal Cortex.

Giuseppe Giglia¹, Lorenzo Pia², Alessia Folegatti²

¹Department of Cognitive Neuroscience, Maastricht University, Maastricht, Netherlands; Hypatia School of Medicine of Caltanissetta - Department of Experimental Biomedicine and Clinical Neurosciences, University of Palermo, Palermo, Italy.

Brain Stimulation

|March 4, 2015

Summary

Repetitive transcranial magnetic stimulation (rTMS) applied to the right posterior parietal cortex (rPPC) induced neglect-like symptoms in near space. This neglect extended to far space when a tool was used, suggesting tool use can remap space representation.

Keywords:

Far space Near space Neglect Posterior parietal cortex Tool use rTMS

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Area of Science:

Neuroscience
Cognitive Psychology
Visuospatial Processing

Background:

Repetitive transcranial magnetic stimulation (rTMS) can induce neglect-like behavior by interfering with the right posterior parietal cortex (rPPC).
Tool use has been shown to modulate spatial representations, potentially remapping far space as near space when a tool extends reach.

Purpose of the Study:

To investigate if rTMS-induced neglect in near space extends to far space when tool use is involved.
To determine if tool use can cause neglect in far space after rTMS on the rPPC.

Main Methods:

Fifteen healthy subjects performed a line length judgment task in near (60 cm) and far (120 cm) space.
On-line rTMS was applied to the rPPC during tasks, with and without tool use in the far space condition.

Main Results:

rTMS over the rPPC caused a significant rightward shift in visuospatial performance in near space.
This neglect-like effect was also observed in far space when subjects used a tool, but not without a tool.

Conclusions:

rTMS on the rPPC selectively affects near space representation.
Tool use can remap far space to be perceived as near space, making it susceptible to neglect induced by rTMS on the rPPC.