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Titolo:
THE YIN AND THE YANG OF VISUOSPATIAL NEGLECT - A CASE-STUDY
Autore:
MARSHALL JC; HALLIGAN PW;
Indirizzi:
UNIV OXFORD,RADCLIFFE INFIRM,DEPT CLIN NEUROL,NEUROPSYCHOL UNIT,WOODSTOCK RD OXFORD OX2 6HE ENGLAND RIVERMEAD REHABIL CTR OXFORD OX1 4XD ENGLAND
Titolo Testata:
Neuropsychologia
fascicolo: 9, volume: 32, anno: 1994,
pagine: 1037 - 1057
SICI:
0028-3932(1994)32:9<1037:TYATYO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNILATERAL NEGLECT; RECOGNITION; ATTENTION; BREAKDOWN; VISION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social Sciences Citation Index
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
J.C. Marshall e P.W. Halligan, "THE YIN AND THE YANG OF VISUOSPATIAL NEGLECT - A CASE-STUDY", Neuropsychologia, 32(9), 1994, pp. 1037-1057

Abstract

We report a patient (R.B.) who has shown gross left visuo-spatial neglect over the 3 years since he sustained a right parietal infarct. Although his neglect is severe on such tasks as line bisection, cancellation, and drawing, there are some domains of preserved perceptual performance: he can perceive subjective contours, he can use lateral symmetry as a cue to figure-ground segregation, and he benefits from some forms of global cueing. In a series of five experiments, we show that R.B. has a selective inability to analyse and copy accurately the left contours of geometric nonsense-figures. These results hold even when there is a single vertical contour (to be copied) that divides a rectangle or a circle into two sub-figures; this physically-identical boundary is copied more accurately when it is cued as the right edge of the left sub-figure than when it is cued as the left edge of the right sub-figure. These effects are not influenced by a manipulation in which R.B. is required to trace the outline of the relevant sub-figure with his finger immediately prior to drawing his copy. The results are interpreted in terms of classical Gestalt theories of figure-ground assignment. Pre-attentive (global) figure-ground parsing is basically intact; but when focal attention is demanded, only the right side of an objectis coded as figure.

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Documento generato il 25/01/20 alle ore 09:32:55