Cognitive symptoms are subtle and are often detected only when neuropsychological tests are performed. They include the following:
- poor "executive functioning" (the ability to absorb and interpret information and make decisions based on that information),
- inability to sustain attention, and
- problems with "working memory" (the ability to keep recently learned information in mind and use it right away)
Cognitive impairments often interfere with the patient's ability to lead a normal life and earn a living. They can cause great emotional distress.