Observational information and qualitative data is analysed according to the neuropsychologists knowledge of how specific behavioural features are related to brain function. Quantitative data comes from psychometric tests. These are developed via extensive research so that they are valid, reliable and meaningful measures of behaviours and cognitive functions. They provide standard scores - where a person's score on the test is compared to what Is normal for their age. Pattern s of impaired and normal scores can be related to specific brain lesions.
Quantitative measures are also sensitive indicators of change.
On average, a comprehensive assessment takes about 2 - 4 hours. This depends on the neuropsychologists own practice. They may give you feedback via a letter, a face to face session or by sending a report. You may receive a copy of the formal report sent to the doctor. You should always ask for a report or feedback - you need to know the results as much as the doctor.