Key result
Right hemisphere stroke slows reaction time globally, while left hemisphere stroke impairs only complex categorisation.
Case-Control (n=159)
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Speed of information processing in the subacute stage after stroke was studied in 88 first ever, unilateral, ischemic stroke patients. The patient group included 42 right and 46 left hemisphere patients. Seventy-one control subjects were also examined. Four reaction time tasks with different levels of complexity were used: two visuomotor, and two semantic categorisation tasks. The results showed that stroke causes a decrease in decision making speed, but that the effect is different for right and left hemisphere patients. The right hemisphere group were slower than the control group on all reaction time tasks, and slower than the left hemisphere patients on the visuomotor tasks. The left hemisphere patients were slower than the healthy controls, only on the most complex tasks, the categorisation tasks.
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Gerritsen et al. (2003) conducted a case-control in First-ever unilateral ischemic stroke in the subacute stage (n=159). Unilateral ischemic stroke (right vs. left hemisphere) vs. Healthy control subjects was evaluated on Speed of information processing measured by four reaction time tasks (two visuomotor and two semantic categorisation tasks). Right hemisphere stroke (n=42) slowed reaction time across all 4 tasks versus controls (n=71), whereas left hemisphere stroke (n=46) slowed performance only on the 2 complex categorisation tasks.
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