Contrary to previous reports, adaptation to laterally displaced visual input does require visual perception of the visuomotor mismatch. Using 4 rhesus monkeys as Ss, it was found that reaching errors induced by wearing 20 diopter wedge prisms remained at optically predicted magnitudes for 24 hr., provided that no visual misreaching cues were available. Unrestricted head movement did not provide such cues. However, terminal viewing of the prism induced reaching errors produced dramatic, rapid adaptation. Tactile and proprioceptive discordance cues alone, without visual feedback, were not corrective.
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