Sensory Input and Control of Grip

  1. Gregory R. Bock organizer and
  2. Jamie A. Goode
  1. Roland S. Johansson

Published Online: 28 SEP 2007

DOI: 10.1002/9780470515563.ch4

Novartis Foundation Symposium 218 - Sensory Guidance of Movement

Novartis Foundation Symposium 218 - Sensory Guidance of Movement

How to Cite

Johansson, R. S. (2007) Sensory Input and Control of Grip, in Novartis Foundation Symposium 218 - Sensory Guidance of Movement (eds G. R. Bock and J. A. Goode), John Wiley & Sons, Ltd., Chichester, UK. doi: 10.1002/9780470515563.ch4

Author Information

  1. Department of Physiology, Umeå University, S-901 87 Umeå, Sweden

Publication History

  1. Published Online: 28 SEP 2007

ISBN Information

Print ISBN: 9780471982623

Online ISBN: 9780470515563

SEARCH

Keywords:

  • sensory input;
  • grip control;
  • parametric adjustments;
  • visual and haptic information;
  • surface friction

Summary

When we use our digits to manipulate objects the applied fingertip forces and torques tangential to the grip surfaces are a result of complex muscle activity. These patterns are acquired during our ontogenetic development and we select them according to the manipulative intent. But the basic force coordination expressed in these patterns has to be tuned to the physical properties of the current object, e.g. shape, surface friction and weight. This takes place primarily by parametric adjustments of the force output based on internal models of the target object, i.e. implicit memory systems that represent critical object properties. From visual or haptic information we identify objects and automatically retrieve the relevant models. These models are then used to adapt the motor commands prior to their execution. The formation of models and their swift updating with changes in object properties depend, however, on signals from tactile sensors in the fingertips.