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Automatic and controlled information processing in multiple sclerosis

P Kujala1, R Portin, A Revonsuo

  • 1Masku Neurological Rehabilitation Centre, Finland.

Brain : a Journal of Neurology
|October 1, 1994
PubMed
Summary
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Multiple sclerosis patients with cognitive deterioration exhibit slower information processing across all stages. Even those with preserved capacities show mild visual processing delays, highlighting processing speed deficits in MS.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system.
  • Cognitive impairment is a common and disabling symptom in multiple sclerosis.
  • Information processing speed is frequently affected in MS, but the specific stages and relationship to cognitive decline require further elucidation.

Purpose of the Study:

  • To investigate the nature of information processing speed deficits in multiple sclerosis (MS).
  • To determine the relationship between slowed information processing and cognitive deterioration in MS patients.
  • To analyze processing speed across distinct stages: automatic processing, controlled processing, and motor programming.

Main Methods:

  • A cohort of 45 patients with a definitive diagnosis of multiple sclerosis (MS) and 35 healthy control subjects were recruited.

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  • MS patients were categorized into two subgroups: mild cognitive deterioration (n=22) and preserved cognitive capacities (n=23).
  • Computerized tests were employed to assess automatic and controlled information processing, as well as motor programming.

    • Main Results:

    • Patients with mild cognitive deterioration in MS demonstrated significantly slower performance across all measured stages of information processing compared to both MS patients with preserved capacities and controls.
    • Even MS patients with preserved cognitive capacities exhibited mild slowing in automatic visual processing.
    • Widespread information processing slowness was found to be associated with cognitive deterioration in multiple sclerosis.

    Conclusions:

    • Information processing slowness is a significant characteristic associated with cognitive deterioration in multiple sclerosis (MS).
    • The findings underscore the importance of analyzing distinct stages of information processing rather than treating MS as a homogenous cognitive entity.
    • Future research should focus on specific patient subgroups and detailed analysis of processing stages to better understand MS-related cognitive impairment.