Pointing and grasping in unilateral visual neglect: Effect of on-line visual feedback in grasping

  • Edwards M
  • Humphreys G
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Abstract

Three experiments are reported examining judgements of the centre of a stick in a patientwith unilateral neglect after right hemisphere damage. Replicating previous data ,judgements showed more evidence of neglect when pointing rather than when a grasp responsewas used (Experiment 1), particularly when pointing preceded grasp (Experiment 2). Neglectalso increased for longer sticks and when sticks fell in the patients left hemispace; the effects ofstick length and hemispace were additive with those of response (point vs grasp). Experiment 3showed that the advantage for grasp over pointing responses occurred only when performancewas guided by on-line visual feedback, and it emerged only during the end part of the reachtrajectory. The results are discussed in relation to the role of visual feedback in movementcontrol. Copyright (C) 1999 Elsevier Science B.V.

Author-supplied keywords

  • Bisection
  • Dorsal
  • Grasp
  • Perception and Action
  • Point
  • Ventral

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