Degree of prismatic displacement and amount of feedback significantly affected adaptation. Asymptotic performance levels indicated that complete adaptation had occurred only in those Ss who received extra feedback during adapting trials. The asymptotic performance of Ss who had received limited feedback reflected differences in degree of optical displacement; the amount of adaptation or learning they showed was approximately proportional to the degree of optical displacement. The magnitude of the aftereffect was significantly influenced by amount of feedback received during adaptation but not by degree of prismatic displacement.
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