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Cognitive slowing and working memory difficulties in chronic fatigue syndrome
P S Marshall1, M Forstot, A Callies
1Department of Psychiatry, Hennepin County Medical Center, Minneapolis, MN 55415, USA.
Psychosomatic Medicine
|January 1, 1997
Summary
Chronic fatigue syndrome (CFS) patients exhibit slower cognitive processing speed and motor skills compared to healthy individuals. These cognitive deficits in CFS are similar to those seen in major depression and dysthymia.
Area of Science:
- Neuroscience
- Psychology
Background:
- Chronic fatigue syndrome (CFS) is frequently associated with self-reported cognitive impairments.
- Objective evaluation of these cognitive complaints is crucial for understanding CFS pathophysiology.
Purpose of the Study:
- To objectively assess cognitive functions in patients with CFS.
- To compare cognitive performance in CFS patients with healthy controls and individuals with major depression or dysthymia.
Main Methods:
- A battery of six cognitive tests was administered over two consecutive days.
- Participants included 20 CFS patients, 20 healthy controls, and 14 patients with a history of major depression or dysthymia.
Main Results:
- CFS patients demonstrated significantly lower scores on tests of motor and cognitive processing speed, including reaction-time tasks.
- Working-memory performance was also impaired in CFS patients, particularly on tasks requiring rapid cognitive processing.
- Cognitive performance in CFS patients did not differ from that of patients with major depression or dysthymia, despite distinct clinical features.
Conclusions:
- CFS is characterized by slowed motor and cognitive processing speed.
- This finding suggests a shared neurobiological mechanism underlying cognitive deficits in CFS and affective disorders like major depression and dysthymia.