ABSTRACT
Neuropsychological assessment carries all sorts of challenges related to differential performance. This is compounded by the fact that complex psychological processes are built on simpler ones. A patient (Sion) is described. He had suffered a severe closed head injury, following a motor-cycle accident. Sion performed poorly on a range of basic executive function measures, administered in batches, and was notably distractible, disinhibited and prone to tiredness. His executive function profile ranged from mild to severely impaired. This was reported as, on average, an impaired executive performance, consistent with his medical history. In supervision, this ‘on average’ argument is investigated in more detail.
