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 .
Brain Injury
|April 8, 2014
Summary
Left hemisphere stroke survivors experience persistent verbal learning and memory deficits, particularly in encoding. They utilize working memory to compensate for these challenges, highlighting the need for accommodations.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Verbal learning and memory impairments are common after stroke.
- Previous research indicated deficits 1 year post-stroke.
- The long-term persistence of these deficits and compensatory mechanisms remained unclear.
Purpose of the Study:
- To determine if verbal learning and memory impairments persist long-term after left hemisphere stroke.
- To investigate if stroke survivors use working memory to compensate for these deficits.
Main Methods:
- Twenty-one individuals with left hemisphere lesions, 20 with right hemisphere lesions, and 41 controls participated.
- Participants completed the Hopkins Verbal Learning Test-Revised (HVLT-R), Letter-Number Sequencing (LNS) for working memory, and the Boston Naming Test (BNT).
Main Results:
- Left hemisphere damage correlated with poorer performance on the HVLT-R (immediate recall, delayed recall, recognition, learning), indicating an encoding impairment.
- Working memory (LNS) and naming ability (BNT) scores predicted recall in the left hemisphere group.
- Right hemisphere stroke patients performed comparably to controls on the HVLT-R, with naming ability (BNT) predicting recall.
Conclusions:
- Individuals with left hemisphere damage exhibit persistent verbal encoding deficits.
- Working memory plays a crucial role in compensating for impaired encoding after left hemisphere stroke.
- Accommodations are necessary for tasks involving verbal encoding and memory in this population.
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