A supramodal representation of the body surface

Article English OPEN
Mancini, F. ; Longo, Matthew R. ; Iannetti, G.D. ; Haggard, P. (2011)

The ability to accurately localize both tactile and painful sensations on the body is one of the most important functions of the somatosensory system. Most accounts of localization refer to the systematic spatial relation between skin receptors and cortical neurons. The topographic organization of somatosensory neurons in the brain provides a map of the sensory surface. However, systematic distortions in perceptual localization tasks suggest that localizing a somatosensory stimulus involves more than simply identifying specific active neural populations within a somatotopic map. Thus, perceptual localization may depend on both afferent inputs and other unknown factors. In four experiments, we investigated whether localization biases vary according to the specific skin regions and subset of afferent fibers stimulated. We represented localization errors as a ‘perceptual map’ of skin locations. We compared the perceptual maps of stimuli that activate Aβ (innocuous touch), Aδ (pinprick pain), and C fibers (non-painful heat) on both the hairy and glabrous skin of the left hand. Perceptual maps exhibited systematic distortions that strongly depended on the skin region stimulated. We found systematic distal and radial (i.e., towards the thumb) biases in localization of touch, pain, and heat on the hand dorsum. A less consistent proximal bias was found on the palm. These distortions were independent of the population of afferent fibers stimulated, and also independent of the response modality used to report localization. We argue that these biases are likely to have a central origin, and result from a supramodal representation of the body surface.
  • References (11)
    11 references, page 1 of 2

    Alloway, K. D., Rosenthal, P., & Burton, H. (1989). Quantitative measurements of receptive field changes during antagonism of GABAergic transmission in primary somatosensory cortex of cats. Experimental Brain Research, 78, 514- 532.

    Apkarian, A. V., Bushnell, M. C., Treede, R. D., & Zubieta, J. K. (2005). Human brain mechanisms of pain perception and regulation in health and disease. European Journal of Pain, 9, 463-484.

    Azanon, E., Longo, M. R., Soto-Faraco, S., & Haggard, P. (2010). The Posterior Parietal Cortex remaps touch into external space. Current Biology, 20, 1304- 1309.

    Batschelet, E. (1981). Circular statistics in biology. New York: Academic Press.

    Bentley, D. E., Watson, A., Treede, R. D., Barrett, G., Youell, P. D., Kulkarni, B., et al. (2004). Differential effects on the laser evoked potential of selectively attending to pain localisation versus pain unpleasantness. Clinical Neurophysiology, 115, 1846-1856.

    Berens, P. (2009). CircStat: A MATLAB toolbox for circular statistics. Journal of Statistical Software, 31, 1-21.

    Bookstein, F. L. (1991). Morphometric tools for landmark data: Geometry and biology Cambridge: Cambridge UP.

    Boring, E. G. (1942). Sensation and perception in the history of experimental psychology. New York: Appleton-Century.

    Brown, P. B., Fuchs, J. L., & Tapper, D. N. (1975). Parametric studies of dorsal horn neurons responding to tactile stimulation. Journal of Neurophysiology, 38, 19- 25.

    Bushnell, M. C., Duncan, G. H., Hofbauer, R. K., Ha, B., Chen, J. I., & Carrier, B. (1999). Pain perception: is there a role for primary somatosensory cortex? Proceedings of the National Academy of Sciences of the United States of America, 96, 7705-7709.

  • Metrics
    No metrics available
Share - Bookmark