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The effects of interference on verbal learning in multiple sclerosis
F L Coolidge1, P A Middleton, J A Griego
1Psychology Department, University of Colorado, Colorado Springs, 80933-7150, USA. FCoolidg@Mail.UCCS.Edu
Summary
Multiple sclerosis (MS) patients exhibit impaired word recall compared to controls, especially when distracter words are present. This suggests retrieval, not encoding, is the primary memory deficit in MS.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Clinical Neurology
Background:
- Multiple sclerosis (MS) is a chronic neurological disease affecting cognitive functions.
- Memory impairments are a common symptom in MS patients, impacting daily life.
- Understanding specific memory deficits in MS is crucial for targeted interventions.
Purpose of the Study:
- To investigate memory recall differences between MS patients and healthy controls.
- To differentiate between encoding and retrieval deficits in MS.
- To explore the impact of distracter words on memory performance in MS.
Main Methods:
- Comparison of 30 MS patients with 30 matched controls on a word learning and recall task.
- Inclusion of distracter words in List 1 and a distracter-free list (List 2).
- Assessment of immediate, short-delay, and long-delay recall, including cued recall and recognition memory.
Main Results:
- MS patients recalled significantly fewer words than controls in the presence of distracters (List 1).
- No significant recall difference was observed between groups when distracters were absent (List 2).
- MS patients showed poorer delayed recall and cued recall, but intact recognition memory.
Conclusions:
- MS patients experience significant difficulties with memory retrieval, particularly in complex recall tasks.
- Encoding processes appear largely intact, suggesting retrieval deficits are more prominent in MS.
- Source memory or contextual information retrieval may be impaired in multiple sclerosis.