Memories are made of this: The effects of time on stored knowledge in a case of visual agnosia.

Riddoch, M. Jane and Humphreys, Glyn W. and Gannon, Theresa A. and Blott, William and Jones, Victoria (1999) Memories are made of this: The effects of time on stored knowledge in a case of visual agnosia. Brain, 122 (3). pp. 537-559. ISSN 0006-8950 . (The full text of this publication is not available from this repository)

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Abstract

We report the effects of the passage of time on the longterm visual knowledge for objects in a patient with visual agnosia (H.J.A.). The naming of real objects was found to have improved, although this was not associated with any change in H,J,A,'s basic perceptual abilities which were stable ever a 16-year period, The improvement in object naming was attributed to better use of non-contour-based visual information (such as surface detail and depth cues). In addition, we demonstrate a deterioration in H.J.A.'s long-term memory for the visual properties of objects, and argue that this has occurred as a result of his having impaired perceptual input, The deterioration was only apparent in drawing from memory and in the verbal descriptions of items; with forced-choice testing, H.J.A. operated at ceiling; we propose that current tests of visual imagery may not be sufficiently sensitive to detect subtle impairments of visual memory, Our findings can be taken to indicate that perceptual and memorial processes are not functionally independent, but are linked in an interactive manner.

Item Type: Article
Uncontrolled keywords: agnosia; stored visual knowledge; visual imagery
Subjects: H Social Sciences
B Philosophy. Psychology. Religion
Divisions: Faculties > Social Sciences > School of Psychology
Depositing User: Theresa Gannon
Date Deposited: 14 Jun 2009 19:21
Last Modified: 09 Jul 2014 13:38
Resource URI: http://kar.kent.ac.uk/id/eprint/14722 (The current URI for this page, for reference purposes)
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