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Description: Individuals with extensive ventral brain lesions cannot identify objects but they can successfully interact with them. What does this reveal about the way the brain is organised? We show that a person who cannot identify objects due to an extensive bilateral ventral brain lesion is able to judge the velocity at which an object moves. Moreover, both his velocity judgements and his interceptive actions are as susceptible to a motion illusion as those of people without brain lesions. These findings speak in favor of dorsal structures processing information about attributes such as velocity, irrespective of whether such information is used for perceptual judgments or to guide actions.