Indices of cognitive dysfunction in relapsing-remitting multiple sclerosis: intra-individual variability, processing
Magdalena Wojtowicz1, Antonina Omisade, John D Fisk
1Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada.
Journal of the International Neuropsychological Society : JINS
|February 22, 2013
Summary
Cognitive impairments in multiple sclerosis (MS) are common. This study found that greater variability in response speed, measured by the Attention Network Test-Interactions (ANT-I), is a key indicator of cognitive difficulties in early MS.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Clinical Neurology
Background:
- Cognitive impairments, particularly in attention and processing speed, are prevalent in multiple sclerosis (MS).
- These deficits can significantly impact daily functioning and overall quality of life for individuals with MS.
Purpose of the Study:
- To investigate attentional efficiency, information processing speed, and response variability in mildly affected MS patients.
- To assess the utility of the Attention Network Test-Interactions (ANT-I) in characterizing cognitive deficits in early MS.
Main Methods:
- Thirty-one relapsing-remitting MS patients and 30 healthy controls completed the ANT-I and the Paced Auditory Serial Attention Test (PASAT).
- Analysis focused on reaction time, attentional efficiency, and intra-individual variability in response speed.
Main Results:
- MS patients exhibited slower reaction times on the ANT-I and poorer performance on the PASAT compared to controls.
- MS patients showed reduced executive control of attention and significantly greater intra-individual variability in response speed.
- Intra-individual variability on the ANT-I was the strongest predictor of group membership.
Conclusions:
- Intra-individual response variability is a sensitive and unique marker of cognitive dysfunction in early MS.
- The ANT-I provides valuable insights into attentional network functioning and cognitive variability in MS.
- Measuring response variability may enhance the assessment of cognitive changes in MS management.
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