
doi: 10.1068/p140691
pmid: 3837871
Observers were trained to point with feedback to red and blue dots whose images had been laterally displaced in opposite directions by a reversible prism. On pretraining and posttraining trials the red and blue dots were aligned vertically in the absence of visual orientation cues. The alignment was modified by the pointing training on the posttraining trials. The colors were aligned in the direction of their prior prismatic displacement. One control experiment showed that the alignment aftereffect, requires feedback during the pointing task. Another experiment in which observers pointed to the red and blue dots with opposite arms showed that pointing to both dots with the same arm was necessary to produce the alignment aftereffect. Changes in the perceived position of objects in the visual field occur when changes in perceived limb position cannot compensate for a sensorimotor conflict. Eye torsion or fixation displacements are proposed as alternative mechanisms mediating the aftereffect.
Perceptual Distortion, Figural Aftereffect, Oculomotor Muscles, Humans, Visual Fields, Adaptation, Physiological, Knowledge of Results, Psychological, Color Perception, Feedback
Perceptual Distortion, Figural Aftereffect, Oculomotor Muscles, Humans, Visual Fields, Adaptation, Physiological, Knowledge of Results, Psychological, Color Perception, Feedback
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