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Visuospatial attention shift and motor responses in cerebellar disorders
S Yamaguchi1, H Tsuchiya, S Kobayashi
1Shimane Medical University, Department of Internal Medicine III, Izumo, Japan. yamagu3n@shimanemed.ac.jp
Journal of Cognitive Neuroscience
|May 2, 1998
Summary
The cerebellum minimally impacts visuospatial attention shifts. However, cerebellar patients showed deficits in response preparation and selection, suggesting its role in these cognitive processes.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- The cerebellum is traditionally linked to motor control.
- Emerging evidence suggests cerebellar involvement in higher cognitive functions, including attention.
Purpose of the Study:
- To investigate the cerebellum's contribution to visuospatial attention shifts.
- To examine the role of the lateral cerebellum in covert spatial attention orienting.
Main Methods:
- Event-related evoked potentials (ERPs) and reaction times (RTs) were recorded.
- A trial-by-trial cueing task was used with patients with cerebellar degenerative disorders and age-matched controls.
Main Results:
- Both groups showed similar reaction times and attention shift-related ERPs for valid vs. invalid cues.
- Early ERP components related to sensory pathway facilitation were comparable between groups.
- Late ERP components reflecting response preparation and selection were reduced in cerebellar patients.
Conclusions:
- The lateral cerebellum appears to have a limited role in visuospatial attention shifts (voluntary or automatic).
- The findings support a role for the lateral cerebellum in neural systems crucial for response preparation and selection.