14. Right Ear Left Thumb
What is being tested?
As we have noted, abnormality of all four of these functions that is out of proportion to other cognitive deficits is strongly localizing to the dominant (usually left) parietal lobe. Otherwise, each of the individual abnormalities can be seen in many different lesions and may be present in individuals with impaired attention, language, praxis (see next page, Apraxia), constructions, logic and abstraction, and so on.