Abstract
The phenomena of prismatically induced “visual capture” and adaptation of the hand were compared. In Experiment 1, it was demonstrated that when the subject’s hand was transported for him by the experimenter (passive movement) immediately preceding the measure of visual capture, the magnitude of the immediate shift in felt limb position (visual capture) was enhanced relative to when the subject moved the hand himself (active movement). In Experiment 2, where the dependent measure was adaptation of the prism-exposed hand, the opposite effect was produced by the active/passive manipulation. It appears, then, that different processes operate to produce visual capture and adaptation. It was speculated that visual capture represents an immediate weighting of visual over proprioceptive input as a result of the greater precision of vision and/or the subject’s tendency to direct his attention more heavily to this modality. In contrast, prism adaptation is probably a recalibration of felt limb position in the direction of vision, induced by the presence of a registered discordance between visual and proprioceptive inputs.
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This investigation was carried out at the University of California, Riverside, while the senior author was on sabbatical leave of absence from the University of Kansas. Portions of this research were presented at the meeting of the Psychonomic Society, Denver, November 1975
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Welch, R.B., Widawski, M.H., Harrington, J. et al. An examination of the relationship between visual capture and prism adaptation. Perception & Psychophysics 25, 126–132 (1979). https://doi.org/10.3758/BF03198798
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DOI: https://doi.org/10.3758/BF03198798