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Andres, Michael
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The contribution of parvo- and magnocellular pathways to size processing for perception and action.
Abstract
We took advantage of the respective physiological properties of the parvo- and magnocellular subcortical pathways to bias visual information either towards the ventral or dorsal stream in order to probe their respective contribution to size estimates for perceptual and graspability judgments. Results showed that both grasping and perceptual judgments can be efficiently performed when the information is biased towards either stream, suggesting that each stream carries sufficient information to support on its own perceptual and grasping judgments. Moreover, the effect of the size-contrast Ebbinghaus illusion on perceptual and grasping judgments was decreased when biased towards the dorsal stream, suggesting that visual context integration requires the parvocellular input of the ventral stream, regardless of the judgment at stake.