 A promising technique to evaluate physiological changes in the brain during an attack is ictal single photon emission computed tomography SPECT scanning. Ictal SPECT is a reliable method to detect a seizure focus during an epileptic seizure. We will utilize ictal SPECT scanning techniques during, and between attacks, and while they are simulating such attacks. The differential activation between the attacks of hyperkinetic movements and the voluntary movements may shed light on the regions of the brain and neurophysiological mechanisms responsible for generation of paroxysmal hyperkinetic movement disorders. 