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In normal adults, even the most mundane interactions with the objects around us are virtuoso feats of elegance and efficiency. Much of this elegance derives from the effortless use of vision to anticipate the properties of objects and to monitor the progress of ongoing movements. In reaching for a glass of water, for instance, visual localization helps you direct your hand to the glass, and visual analyses of its size and shape guide your hand to enclose it. Vision may also prompt you to veer around other objects or to correct your movement for errors or for changes in the position of the glass or obstacles. Optic ataxia describes a condition in which some or all of these abilities are lost following damage to the ...

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