Although electrocardiograms (EEGs) often appear normal, those with cognitive problems may have an abnormal increase in slow-wave activity. Using digital technology, quantitative EEG is a noninvasive measurement of electrical problems at the surface of the scalp that reflect cortical electrical activity, or brain waves, which occur at various frequencies (EEG bands). Many CFS patients display unique functional brain abnormalities during cognitive challenges. Brain mapping documents cognitive decline and improvement, tracking treatment efficacy.
Various neurofeedback protocols are used, and many sessions may be required for optimal results. Results are purported to include improved concentration and short-term memory, reduction or resolution of physical stamina, decreased sensitivity to light and sound, increased attention span, and fewer letter or word reversals. Neurofeedback is in its early stages and has not been formally tested yet, but it holds promise in normalizing brain waves and creating cognitive improvement.
(Source: Chronic Fatigue Syndrome, Fibromyalgia and Other Invisible Illnesses, by Katrina Berne, Ph.D.)