What is a neuropshycological evaluation?

I got this info from: eMedicine - Neuropsychological Evaluation : Article by Atif Malik

Neuropsychological evaluation (NPE) is a testing method through which a neuropsychologist can acquire data about a subject’s cognitive, motor, behavioral, language, and executive functioning. In the hands of a trained neuropsychologist, these data can provide information leading to the diagnosis of a cognitive deficit or to the confirmation of a diagnosis, as well as to the localization of organic abnormalities in the central nervous system (CNS); the data can also guide effective treatment methods for the rehabilitation of impaired patients.

NPE provides insight into the psychological functioning of an individual, a capacity for which modern imaging techniques have only limited ability. However, these tests must be interpreted by a trained, experienced neuropsychologist in order to be of any benefit to the patient. These tests are often coupled with information from clinical reports, physical examination, and increasingly, premorbid and postmorbid self and relative reports. Alone, each neuropsychological test has strengths and weaknesses in its validity, reliability, sensitivity, and specificity. However, through eclectic testing and new in situ testing, the utility of NPE is increasing dramatically.

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Neuropsychology Central - Resources

That looks about right, since I've had two. Testing is LONG. 6 to 8 hours is common. It may require multiple visits.