Covert processing of visual form in the absence of area LO

Neuropsychologia
R W KentridgeA D Milner

Abstract

The patient D.F., who suffers from severe visual form agnosia, has been found to have a bilateral lesion of area LO, an area known to be intimately involved in the perception of object shape. Despite her perceptual impairment, however, D.F. retains residual form processing abilities that can provide distal visuomotor control, for example in the configuration of her grasp when reaching to pick up objects of different shapes and sizes. This dissociation has been interpreted as reflecting the sparing of a dedicated system for processing the physical properties of objects solely for purposes of guiding action. Here we test this hypothesis in two studies designed to examine whether or not spared shape processing capacities might be revealed under other kinds of indirect test conditions. First, we exploited the fact that a redundant shape cue will speed search for a coloured stimulus within an array, and vice versa. Unlike our control subjects, D.F. showed no facilitation effect of either kind. Second, we used two Stroop tasks in which single coloured uppercase letters were presented. Our intention was to determine (a) whether naming the colour would be influenced by whether the letter was the initial letter of the correct or incorre...Continue Reading

References

Feb 1, 1991·Brain : a Journal of Neurology·A D MilnerE Terazzi
Sep 1, 1989·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·A D Milner, C A Heywood
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Sep 10, 2003·Experimental Brain Research·Jody C CulhamMelvyn A Goodale
Sep 25, 2003·Brain : a Journal of Neurology·Thomas W JamesMelvyn A Goodale

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Citations

Jul 5, 2006·Experimental Brain Research·Amanda Ellison, Alan Cowey
Jan 29, 2010·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Arun P Sripati, Carl R Olson
Apr 20, 2006·Neuropsychologia·Jiongjiong YangZheng Shen
Mar 21, 2007·Neuropsychologia·Ceri T TrevethanLarry Weiskrantz

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