Studies have shown
that the patient's adjustment can be deeply impacted by mild impairments
in functions such as short-term memory. The extra effort, vigilance,
and concentration needed to compensate for such mild deficits result in
an enormous fatiguing effect. Such an effort produces a continuous
drain on energy levels and results in chronic fatigue. Intellectual functions
such as short-term memory tend to deteriorate as fatigue increases.
Such practices give rise to a vicious cycle that to leads feelings
of inadequacy, discouragement, irritability and depression.
-- Source -- Neuropsychological
Assessment, 2nd Ed., 1983, by Muriel D. Lezak