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Naturalistic action production following right hemisphere stroke
M F Schwartz1, L J Buxbaum, M W Montgomery
1Moss Rehabilitation Research Institute, Temple University, Philadelphia, PA 19141-3099, USA. mschwar@vm.temple.edu
Neuropsychologia
|January 27, 1999
Summary
Right hemisphere stroke patients exhibit higher action errors than head injury patients. Resource limitations, like reduced arousal, may explain these deficits, particularly in those with neglect.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Naturalistic action production is crucial for daily functioning.
- Brain damage, particularly in the right hemisphere, can impair complex actions.
- Previous research highlighted action deficits in head injury patients.
Purpose of the Study:
- To investigate action production errors in semi-acute right hemisphere stroke patients.
- To compare error patterns between stroke patients and head injury patients.
- To explore the role of resource limitations and neglect in action deficits.
Main Methods:
- Thirty right hemisphere stroke patients performed a laboratory test of naturalistic action production.
- Patient responses were analyzed for error types and patterns.
- Comparison was made with previously reported data from head injury patients.
Main Results:
- Stroke patients produced action errors at a higher rate than head injury patients.
- Both groups showed similar responses to task demand variations.
- Hemispatial biases in errors were observed in stroke patients with neglect.
- Neglect patients also made errors unrelated to spatial layout.
Conclusions:
- A non-specific resource limitation (e.g., reduced arousal/effort) is a key factor in action breakdown after brain damage.
- Right hemisphere stroke patients are particularly vulnerable to resource limitations affecting action production.
- Neglect exacerbates action deficits in right hemisphere stroke patients.