The jury put little faith in his testimony. The method of neuropsychologic testing is also subject to cross-examination. Most neuropsychologists agree that part of their assessment includes observations of the patient during interview and testing. It is not only the response, but also how it is given, that is being observed. A neuropsychologist who utilizes technicians to perform tests will find it difficult to justify interpreting test results taken by another person, without having directly observed the patient.
Neuropsychology provides a significant benefit to patients with head injury.