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Differences in visuospatial processing in individuals with nonverbal learning disability or autism spectrum disorder
Irene C Mammarella1, Ramona Cardillo1, Leonardo Zoccante2
1Department of Developmental and Social Psychology.
Neuropsychology
|October 19, 2018
Summary
Children with nonverbal learning disability (NLD) showed more significant visuospatial deficits than those with autism spectrum disorder (ASD) without intellectual disability. This study differentiates NLD and ASD visuospatial processing profiles.
Area of Science:
- Neuroscience
- Developmental Psychology
- Cognitive Science
Background:
- Previous research indicates visuospatial deficits in nonverbal learning disability (NLD).
- Limited studies compare the visuospatial profiles of NLD and autism spectrum disorder (ASD) in visuoconstruction and working memory tasks.
- The role of local bias in ASD has not been extensively studied in comparison to NLD.
Purpose of the Study:
- To analyze shared characteristics between NLD and ASD.
- To compare the visuospatial processing profiles of individuals with NLD and ASD without intellectual disability (ID).
- To investigate the influence of global-local processing manipulation on these groups.
Main Methods:
- Compared three groups: NLD (n=17), ASD without ID (n=17), and controls (n=17), aged 8-18 years.
- Administered visuoconstructive and visuospatial working memory tasks.
- Manipulated global-local processing styles within the tasks.
Main Results:
- Visuospatial processing clearly distinguished between ASD without ID and NLD groups.
- The NLD group performed significantly worse than the ASD without ID group across all tested domains.
- The ASD without ID group exhibited a more heterogeneous visuospatial profile, with diminished perceptual cohesiveness sensitivity primarily in the visuoconstructive task.
Conclusions:
- Visuospatial domain examination and stimulus cohesiveness manipulation aid in discriminating between NLD and ASD without ID.
- Findings highlight distinct visuospatial processing deficits in NLD compared to ASD without ID.
- Further research can refine diagnostic criteria by exploring these specific visuospatial differences.
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