An Attempt to Replicate a Study of Disarranged Eye-Hand Coordination

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Abstract
Three groups of 15 Ss each were tested for disarranged eye-hand coordination in the distance dimension. All groups were tested using a bipartite box which permitted lighting only the upper or lower chambers. S was required to place a dot at the location of a virtual image of a target without seeing his hand. After making 30 such dots he was exposed to one of three conditions, after which he repeated the pre-exposure test. The three conditions were: (a) constrained self-produced hand movement with 7.6 cm. displacement, (b) free hand movement with 7.6 cm. displacement, (c) free hand movement without displacement (control). The results indicated a predominant proportion of individuals with negative adaptation in all groups. The two groups with reafference (stimulation through self-induced movement) and displacement did not differ significantly from the control group in the magnitude or the direction of adaptation. Our results could not be predicted from reafference theory and do not conform to the results of Held and Schlank, in which positive adaptation was obtained in a similar mirror-displacing situation.

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