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Object-based and action-based visual perception in children with spina bifida and hydrocephalus
Maureen Dennis1, Jack M Fletcher, Tracey Rogers
1Department of Psychology, The Hospital for Sick Children, Toronto, ON, Canada. mdennis@sickkids.on.ca
Insights
Children with spina bifida and hydrocephalus (SBH) experience greater visual perception challenges in action-based tasks compared to object-based ones. These findings highlight spatial cognition difficulties impacting visually guided actions and environmental navigation.
Area of Science:
- Neuroscience
- Developmental Psychology
- Ophthalmology
Background:
- Children with spina bifida and hydrocephalus (SBH) often exhibit visual perception deficits.
- Understanding these deficits is crucial for developing targeted interventions.
Purpose of the Study:
- To investigate the performance of children with SBH across a range of visual perception tasks.
- To differentiate between object-based, spatial representation, and action-based visual processing challenges.
Main Methods:
- Assessed 12 visual perception tasks in children with SBH and controls.
- Tasks included object identification, spatial representation, and visually guided actions.
- Analyzed effect sizes to quantify performance differences.
Main Results:
- Effect sizes were significantly larger for action-based visual perception tasks compared to object-based tasks.
- Within action-based tasks, spatial representation and visually guided action showed comparable large effect sizes.
- Children with SBH demonstrated particular difficulties with tasks requiring the integration of visual information for movement.
Conclusions:
- Children with SBH face pronounced difficulties in visual perception, especially in tasks linking vision to action.
- Physical and neurological factors associated with SBH likely impair the development of effective spatial situation models.
- Further research should focus on the neural underpinnings of these spatial cognition deficits in SBH.
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.