Related Experiment Video
Updated: Feb 18, 2026
Comprehensive Autopsy Program for Individuals with Multiple Sclerosis
Published on: July 19, 2019
Information processing deficits as a driving force for memory impairment in MS: A cross--sectional study of memory
Wolfgang Köhler1, Martin Fischer1, Peter Bublak2
1Fachkrankenhaus Hubertusburg, Department of Neurology, 04779 Wermsdorf, Germany.
Background:
Memory impairment (MI) is a common symptom of MS. Previous studies were conflicting in respect to the possible existence of early MI and the role of hippocampal atrophy. The objective of this study was to investigate MI and structural MRI correlates in homogenous groups of early and late MS, controlling for a potential information-processing speed (IPS) deficit, and utilizing multiple memory test paradigms.
Methods:
152 individually matched subjects were recruited: early MS (EMS, N = 25, disease duration 1.0 ± 0.8 years), late MS (LMS, N = 52, 16.5 ± 5.2 years), and corresponding controls. Five memory tests were utilized to account for differences in learning material (verbal, visual), encoding (incidental, intentional), and retrieval (free recall, recognition, recurring recognition). Performance was related to IPS, memory-specific (hippocampal volumes), and unspecific MRI measures (T1/T2LL, brain volume, cortical thickness).
Results:
Memory was impaired across all tests in LMS, but not in EMS. LMS-patients were also significantly impaired in IPS which was correlated with several memory scores. Regression analyses revealed IPS and cortical thickness as predictors for visual MI, and IPS, sex, and left hippocampal volume as predictors for verbal MI.
Conclusion:
Additionally to direct destructions in memory specific tracts such as the hippocampus, memory decline in MS may also be related to a general factor comprising slowed information-processing and global tissue loss.
Insights
Memory impairment is not present in early multiple sclerosis (MS) but is evident in late MS, alongside slowed information processing. Hippocampal volume and cortical thickness predict memory decline in MS patients.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Memory impairment (MI) is a frequent symptom in multiple sclerosis (MS).
- Previous research on early MI and hippocampal atrophy in MS yielded conflicting results.
- This study aimed to clarify MI and its structural MRI correlates in early and late MS.
Purpose of the Study:
- To investigate memory impairment in early and late MS patients.
- To identify structural MRI correlates of memory impairment, including hippocampal volume and cortical thickness.
- To control for the impact of information-processing speed (IPS) deficits on memory performance.
Main Methods:
- 152 matched subjects (early MS, late MS, controls) were recruited.
- Five memory tests assessed verbal and visual memory with varied encoding and retrieval conditions.
- Performance was correlated with IPS, hippocampal volumes, and other MRI measures like cortical thickness.
Main Results:
- Memory was impaired in late MS patients but not in early MS patients.
- Late MS patients showed significant IPS deficits correlated with memory scores.
- IPS and cortical thickness predicted visual MI; IPS, sex, and left hippocampal volume predicted verbal MI.
Conclusions:
- Memory decline in MS is linked to direct damage in memory-specific areas like the hippocampus.
- Slowed information processing and global tissue loss contribute to memory decline in MS.
- Early MS may not exhibit memory impairment, suggesting a progressive nature of cognitive deficits.
