Visual enhancing of tactile perception in the posterior parietal cortex.
The visual modality typically dominates over our other senses. Here we show that after inducing an extreme conflict in the left hand between vision of touch (present) and the feeling of touch (absent), sensitivity to touch increases for several minutes after the conflict. Transcranial magnetic stimulation of the posterior parietal cortex after this conflict not only eliminated the enduring visual enhancement of touch, but also impaired normal tactile perception. This latter finding demonstrates a direct role of the parietal lobe in modulating tactile perception as a result of the conflict between these senses. These results provide evidence for visual-to-tactile perceptual modulation and demonstrate effects of illusory vision of touch on touch perception through a long-lasting modulatory process in the posterior parietal cortex.
Ro
Tony
T
Department of Psychology-MS 25, Rice University, 6100 Main Street, Houston, TX 77005-1892, USA. tro@rice.edu
Wallace
Ruth
R
Hagedorn
Judith
J
Farnè
Alessandro
A
Pienkos
Elizabeth
E
D004558:Electric Stimulation; D004574:Electromagnetic Fields; D006801:Humans; D008606:Mental Processes / Q000502:physiology* / Q000528:radiation effects; D009433:Neural Inhibition / Q000528:radiation effects; D009434:Neural Pathways / Q000502:physiology* / Q000528:radiation effects; D010296:Parietal Lobe / Q000502:physiology* / Q000528:radiation effects; D011930:Reaction Time / Q000502:physiology / Q000528:radiation effects; D012016:Reference Values; D015398:Signal Transduction / Q000502:physiology / Q000528:radiation effects; D014110:Touch / Q000502:physiology* / Q000528:radiation effects; D014796:Visual Perception / Q000502:physiology* / Q000528:radiation effects