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The impact of early unilateral brain injury on perceptual organization and visual memory
Natacha A Akshoomoff1, Corbin C Feroleto, Rebecca E Doyle
1Laboratory for Research on the Neuroscience of Autism, Children's Hospital Research Center, 8110 La Jolla Shores Drive, San Diego, La Jolla, CA 92037, USA. natacha@ucsd.edu
Insights
Children with early unilateral brain injury show lasting visuospatial deficits. Despite developmental compensation, they retain immature strategies on complex figure tasks, indicating persistent subtle impacts of early brain injury.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Early unilateral brain injury can impact visuospatial processing.
- The developing brain shows some capacity for compensation following injury.
- Established neural networks may limit compensatory abilities later in development.
Purpose of the Study:
- To investigate visuospatial processing in children with early unilateral brain injury using the Rey-Osterrieth Complex Figure.
- To determine if compensatory patterns observed in early development persist into later childhood.
Main Methods:
- Longitudinal and cross-sectional study of children with early left hemisphere (LH) or right hemisphere (RH) injury.
- Analysis of copying and memory drawing performance on the Rey-Osterrieth Complex Figure.
- Comparison with typically developing children.
Main Results:
- Children with early unilateral brain injury performed poorer on figure copying compared to controls.
- Despite developmental improvements, both LH and RH injury groups used immature, piecemeal strategies.
- In memory recall, LH injury group showed better organization around the core figure than RH injury group.
Conclusions:
- Subtle visuospatial deficits persist into later development following early unilateral brain injury.
- The brain retains a capacity for compensation, though specific strategies may be affected by injury laterality.
- Understanding these long-term effects is crucial for targeted interventions.
Abstract:
Studies of young children with early unilateral brain injury have suggested that while hemispheric differences in visuospatial processing appear to be present early in development, the young brain is better able to compensate for injury than when the injury occurs later, after networks have been established. The aim of this study was to determine if this pattern continues later in development when these children are given a challenging task: the Rey-Osterrieth Complex Figure. Experiment 1 included longitudinal data from ten children with early left hemisphere (LH) injury and nine children with early right hemisphere (RH) injury. Injury was presumed to be due to a prenatal or perinatal stroke. Compared with typically developing children, both groups were poorer in copying the figure. With development, these children produced reasonably accurate drawings but continued to use the most immature and piecemeal strategy. In Experiment 2, copy and immediate memory drawings from the 19 children with early unilateral brain injury were collected at a single age (11-14 years). Eight of the ten children with LH injury organized their memory reproductions around the core rectangle but included relatively few additional details. In contrast, only two of the nine children with RH injury organized their memory reproductions around the core rectangle and all but one produced the figure in a piecemeal manner. The results from both studies demonstrate the continuation of subtle deficits in visuospatial analysis with development but also the continued capacity for compensation.