Critically evaluate the methods of investigation employed by neuropsychologists.

This essay aims to look at some of the methods of investigation employed by neuropsychologists when trying to find the root of neuropsychological problems in clients.  This essay will focus on the brain imaging techniques available to neuropsychologists for identifying brain structure, brain function and brain abnormality.  The specific techniques that will be evaluated are Computerised Axial Tomography (CT scan), Positron Emission Tomography (PET scan), Magnetic Resonance Imaging (MRI scan) and Fluorescent  Magnetic Resonance Imaging (fMRI scan)….(short extract)