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Seeing the forest but only half the trees? [Letter]

Marshall, J. C. and Halligan, Peter 1995. Seeing the forest but only half the trees? [Letter]. Nature 373 (6514) , pp. 521-523. 10.1038/373521a0

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IN visuo-spatial neglect after right hemisphere damage, patients fail overtly to notice and respond to stimuli on the side of space contralateral to lesion1,2. Nonetheless, these neglected stimuli may covertly influence their performance in other tasks less direct than overt detection or identification1. We report here a new type of dissociation between two forms of conscious perceptual awareness in a patient with left neglect. J.R. was shown hierarchical drawings in which a larger (global) form, such as a geometric figure or an alphabetic letter, is composed of smaller (local) forms (dots, circles, or letters). She gave accurate verbal reports of the global structure of these stimuli (Navon figures3), yet when required to cross out the smaller subfigures, she only cancelled those on the right of each global figure. Conscious perception of the whole does not automatically lead to visual awareness of all the parts thereof.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher: Nature Publishing Group
ISSN: 0028-0836
Last Modified: 04 Jun 2017 04:14

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