when you affect the right side of the brain and you get the inferior part of what is called the parietal lobuleand these patients have great difficulty orienting and reacting to stimuli in one half of the visual space or one half of their body, in this case the left side so for example if you you touch them after this lesion on the left side you ask where you're touching them, they'll say my right. when you walk into the room from the left, they'll go "hello" and turn their head to the right. so profound cognitive problems caused by a fairly focal lesion. in some cases thing is very local and you get a local effect, that's why some people thought it was localized, in another another case you have a focal region and you get a more global abnormity so you can see by continuing to study patients with imaging techniques that allow us to see this architecture, we can actually learn fundamental principles about how the brain is put together. so parkinson's patients have a part of their syndrome is bradykinesia. they move slowly. so a colleague of mine asked a question that one tends not to ask. why d