Verbal learning and memory following stroke
Glenda Andrews1, Graeme S Halford, David H K Shum
1Behavioural Basis of Health Program, Griffith Health Institute, Griffith University , Australia .
Objective:
The research examined whether verbal learning and memory impairment previously observed 1 year after left hemisphere stroke endures over a longer period and whether stroke sufferers compensate for their impairments using working memory.
Methodology:
Twenty-one persons with left hemisphere lesions; 20 with right hemisphere lesions only and 41 matched controls completed the Hopkins Verbal Learning Test-Revised (HVLT-R), a working memory test (Letter-Number Sequencing, LNS) and the Boston Naming Test (BNT).
Results:
Persons with left hemisphere damage performed more poorly on HVLT-R than controls. They showed poorer immediate recall, delayed recall, recognition and learning, but intact retention, suggesting an encoding impairment. BNT and LNS scores predicted recall in this group. HVLT-R performance of persons with right hemisphere lesions only was comparable to controls. BNT (not LNS) predicted recall in these groups.
Conclusions:
Persons with left hemisphere damage relied more on working memory and recruited diverse left hemisphere regions to compensate for their impaired encoding.
Implications:
Tasks requiring verbal encoding and memory are effortful following left hemisphere stroke. This should be recognized and accommodated.
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