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Object-based and action-based visual perception in children with spina bifida and hydrocephalus

Published online by Cambridge University Press:  11 January 2002

MAUREEN DENNIS ,
JACK M. FLETCHER ,
TRACEY ROGERS ,
ROSS HETHERINGTON,  and
DAVID J. FRANCIS
MAUREEN DENNIS
Affiliation:
Department of Psychology, The Hospital for Sick Children, Toronto, Canada Department of Surgery, University of Toronto, Toronto, Canada Department of Psychology, University of Toronto, Toronto, Canada
JACK M. FLETCHER
Affiliation:
Department of Pediatrics, University of Texas–Houston
TRACEY ROGERS
Affiliation:
Department of Psychology, The Hospital for Sick Children, Toronto, Canada
ROSS HETHERINGTON,
Affiliation:
Department of Psychology, The Hospital for Sick Children, Toronto, Canada Department of Psychology, University of Toronto, Toronto, Canada
DAVID J. FRANCIS
Affiliation:
Department of Psychology, University of Houston, Houston, Texas
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Abstract

Children with spina bifida and hydrocephalus (SBH) have long been known to have difficulties with visual perception. We studied how children with SBH perform 12 visual perception tasks requiring object identification, multistable representations of visual space, or visually guided overt actions. Four tasks required object-based processing (visual constancy illusions, face recognition, recognition of fragmented objects, line orientation). Four tasks required the representation of visual space in egocentric coordinates (stereopsis, visual figure-ground identification, perception of multistable figures, egocentric mental rotation). Four tasks required the coupling of visual space to overt movement (visual pursuit, figure drawing, visually guided route finding, visually guided route planning). Effect sizes, measuring the magnitude of the difference between SBH children and controls, were consistently larger for action-based than object-based visual perception tasks. Within action-based tasks, effect sizes were large and roughly comparable for tasks requiring the representation of visual space and for tasks requiring visually guided action. The results are discussed in terms of the physical and brain problems of children with SBH that limit their ability to build effective situation models of space. (JINS, 2002, 8, 95–106.)

Keywords

Visual perceptionSpina bifida-HydrocephalusVentral streamDorsal stream
Type
Research Article
Information
Journal of the International Neuropsychological Society , Volume 8 , Issue 1 , January 2002 , pp. 95 - 106
Copyright
© 2002 The International Neuropsychological Society

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