Experimental Brain Research

, Volume 202, Issue 2, pp 499–505 | Cite as

Distorting the visual size of the hand affects hand pre-shaping during grasping

  • Barbara F. M. Marino
  • Natale Stucchi
  • Elena Nava
  • Patrick Haggard
  • Angelo Maravita
Research Note


Vision of the body is known to affect somatosensory perception (e.g. proprioception or tactile discrimination). However, it is unknown whether visual information about one’s own body size can influence bodily action. We tested this by measuring the maximum grip aperture (MGA) parameter of grasping while eight subjects viewed a real size, enlarged or shrunken image of their hand reaching to grasp a cylinder. In the enlarged view condition, the MGA decreased relative to real size view, as if the grasping movement was actually executed with a physically larger hand, thus requiring a smaller grip aperture to grasp the cylinder. Interestingly, MGA remained smaller even after visual feedback was removed. In contrast, no effect was found for the reduced view condition. This asymmetry may reflect the fact that enlargement of body parts is experienced more frequently than shrinkage, notably during normal growth. In conclusion, vision of the body can significantly and persistently affect the internal model of the body used for motor programming.


Body representation Body size distortion Grasping Vision Somatosensory Multisensory 


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Barbara F. M. Marino
    • 1
    • 2
  • Natale Stucchi
    • 2
  • Elena Nava
    • 3
  • Patrick Haggard
    • 4
  • Angelo Maravita
    • 2
  1. 1.Department of NeuroscienceUniversity of ParmaParmaItaly
  2. 2.Department of PsychologyUniversity of Milano-BicoccaMilanItaly
  3. 3.CIMeC (Center for Mind/Brain Sciences)Rovereto (TN)Italy
  4. 4.Institute of Cognitive NeuroscienceUniversity College LondonLondonUK

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