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Visual object and visuospatial cognition in Huntington's disease: implications for information processing in
A D Lawrence1, L H Watkins, B J Sahakian
1Department of Experimental Psychology, University of Cambridge, MRC Cognition and Brain Sciences Unit, Cambridge, UK. andrew.lawrence@mrc-cbu.cam.ac.uk
Brain : a Journal of Neurology
|June 27, 2000
Summary
Huntington's disease patients show deficits in visual object and spatial cognition, highlighting the basal ganglia's role in these functions. This research clarifies the basal ganglia's involvement in visual processing and its disruption in disease.
Area of Science:
- Neuroscience
- Cognitive Science
- Primate Visual System
Background:
- The primate visual system has two streams: ventral (object cognition) and dorsal (visuospatial cognition).
- Both streams project to the basal ganglia, suggesting its role in visual cognition.
- Huntington's disease, primarily affecting the basal ganglia, offers a model to study these functions.
Purpose of the Study:
- To investigate the role of the basal ganglia in human visual object and visuospatial cognition.
- To understand the disruption of these cognitive processes in Huntington's disease.
Main Methods:
- Administered a comprehensive battery of tests assessing recognition memory, working memory, attention, associative learning, and perception.
- Compared performance of Huntington's disease patients with controls.
Main Results:
- Huntington's disease patients exhibited deficits in pattern and spatial recognition memory.
- Impairments were observed in simultaneous and delayed matching-to-sample tasks.
- Spatial working memory was impaired, while visual object working memory was spared.
- Pattern-location associative learning was impaired, and visual search showed slowed reaction times.
Conclusions:
- The basal ganglia, particularly the striatum, play a crucial role in visual object and visuospatial cognition.
- Huntington's disease significantly disrupts these basal ganglia-dependent visual cognitive functions.
- Findings support theories of the striatum's role in context-dependent action selection.