State the term - localisation scales
The localisation scales are also empirically derived, being based on studies of patients with localised brain lesions. There are frontal, sensorimotor, temporal, and parieto-occipital scales for each hemisphere. The factor scales are based on extensive factor analytical studies of the main content scales. The new right and left hemisphere scales have items from throughout the battery and are based on actual comparisons between patients with right hemisphere, left hemisphere and diffuse brain damage. The new right and left hemisphere, localisation factor scales might all be expressed in T scores with a mean of 50. There are also two scales that provide global indices of dysfunctions, and are meant as equivalents to the Halstead impairment index. They are called the Profile Elevation and Impairment Scales