The influence of visual perturbations on the neural control of limb stiffness.

ABSTRACT: To adapt to novel unstable environments, the motor system modulates limb stiffness to produce selective increases in arm stability. The motor system receives information about the environment via somatosensory and proprioceptive signals related to the perturbing forces and visual signals indicating deviations from an expected hand trajectory. Here we investigated whether subjects modulate limb stiffness during adaptation to a purely visual perturbation. In a first experiment, measurements of limb stiffness were taken during adaptation to an elastic force field (EF). Observed changes in stiffness were consistent with previous reports: subjects increased limb stiffness and did so only in the direction of the environmental instability. In a second experiment, stiffness changes were measured d

SUBMITTER: Wong J 

PROVIDER: S-EPMC2637017 | biostudies-literature | 2009 Jan

REPOSITORIES: biostudies-literature