Pointing to places and spaces in a patient with visual form agnosia

Neuropsychologia
David P CareyA D Milner

Abstract

Previous investigations of visuospatial abilities in the visual form agnosic patient D.F. suggest that her egocentric sensorimotor processing is intact while her 'allocentric' judgments of spatial position are impaired. The current investigation extends these previous observations by comparing D.F.'s performance at pointing to a set of spatially distributed stimuli, either directly or by 'pantomiming' the responses in an adjacent homologous workspace. The results showed accurate sensorimotor localization when D.F. pointed directly to single targets or to sequences of targets, presumably as she could use egocentric visual coding. In spite of making relatively spared spatial judgments about the arrays, however, D.F. performed quite poorly when copying them and on the pantomimed pointing task. In this latter task good performance presumably depends on an ability to represent both the categorical and coordinate properties of the array (as does copying them), and to translate these into the effector-based coordinates required for accurate action. D.F.'s pantomimed pointing was similar to her copies of target arrays, as in both tasks there was evidence of spared (although somewhat degraded) appreciation of the relative spatial positi...Continue Reading

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Citations

Feb 3, 2009·Experimental Brain Research·Marian E BerryhillIngrid R Olson
Jan 29, 2011·The Quarterly Journal of Experimental Psychology : QJEP·Francesco RuotoloAlbert Postma
Apr 18, 2013·The Quarterly Journal of Experimental Psychology : QJEP·Vyacheslav Karolis
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Jul 25, 2007·Proceedings of the National Academy of Sciences of the United States of America·Gordon BinstedDeborah Saucier
Oct 8, 2011·Neuropsychologia·Monika Harvey, Stéphanie Rossit
May 12, 2009·Neuropsychologia·Robert D McIntosh, Thomas Schenk
Nov 29, 2008·Neuropsychologia·Lee H de-WitA David Milner
Mar 25, 2014·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Constanze Hesse, Thomas Schenk
Oct 13, 2009·Perception·Lee H de-WitA David Milner
Feb 23, 2019·PLoS Computational Biology·David Aagten-Murphy, Paul M Bays
Aug 23, 2018·Experimental Brain Research·Matthew R Longo
Mar 4, 2017·Experimental Brain Research·A D Milner

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