In addition to cognitive tests, the neuropsychologist might also administer psychological tests. These might include commonly used screening tools such as the Patient Health Questionnaire-9 (PHQ-9)6 or Geriatric Depression Scale (GDS),7 or more comprehensive objective personality measures, such as the Minnesota Multiphasic Personality Inventory-2-Restructured Format (MMPI-2-RF)8 or Personality Assessment Inventory (PAI).9 These tests, along with a thorough clinical history, can help identify if a psychiatric condition is present. In addition, for the more extensive tests such as the MMPI-2-RF or PAI, there are certain neuropsychological profiles that are consistent with a psychiatric etiology for cognitive difficulties. These profiles are formulated based on specific test scores in combination with complex patient variables.
Understanding the report
While there will be stylistic differences in reports depending on the neuropsychologist’s setting, referral source, and personal preferences, most will include discussion of why the patient was referred for evaluation and a description of the onset and progression of the problem.10 Reports often also include pertinent medical and psychiatric history, substance use history, and family medical history. A section on social history is important to help establish premorbid functioning, and might include information about prenatal/birth complications, developmental milestones, educational history, and occupational history. Information about current psychosocial support or stressors, including marital status or current/past legal issues, can be helpful. In addition to this history, there is often a section on behavioral observations, especially if anything stood out or might have affected the validity of the data.
There are also objective measures of validity that the neuropsychologist might administer to evaluate whether the results are valid. Issues of validity are monitored through the evaluation, and are used to determine if the results are consistent with known neurologic patterns. If the results are deemed not valid, then low scores cannot be reliably interpreted as evidence of impairment. This is akin to an arm moving during an X-ray, thereby blurring the results. If valid, the results of objective testing are include in the neuropsychologist’s report; this can range from providing raw scores, standard scores, and/or percentiles to a general description of how the patient did on testing.
The section that is usually of most interest to psychiatric clinicians is the summary, which explains the results, might offer a diagnosis, and discusses possible etiologies. This might be where the neuropsychologist discusses if the findings are due to a neurologic or psychiatric condition. From this comes the neuropsychologist’s recommendations. When a psychiatric condition is determined to be the underlying etiology, the neuropsychologist might recommend psychotherapy or some other psychiatric treatment.
Why is neuropsychological testing important?
Schizophrenia, MDD, bipolar disorder, and PTSD produce significant neurobiologic changes that often result in deterioration of a patient’s global cognitive function. Increased emphasis and attention in psychiatric research have yielded more clues to the neurobiology of cognition. However, even though many psychiatric clinicians are trained in cognitive assessments, such as the “clock test,” “serial sevens,” “numbers forward and backward,” “proverb,” and “word recall,” and common scenarios to evaluate judgment and insight, such as “mailing a letter” and “smoke in a movie theatre,” most of these components are not completed during a standard psychiatric evaluation. Because the time allotted to completing a psychiatric evaluation continues to be shortened, it is sometimes difficult to complete the “6 bullets” required by the Centers for Medicare & Medicaid Services as part of the mental status exam (Table 311).
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