Hi Julian, Welcome. There are no dumb questions. "On" and "Off" in Parkiespeak, referes to whether or not your body is responding to your PD medications (especially the levodopa meds, Sinemet and Madopar which I see are as yet in your future). Not everybody experiences the "on"/"off" syndrome; some PWP (People with Parkinson's) seem to level out and maintain a 'plateau'. Others experience the "on"/"off" syndrome from the first, and a great many develop it as the disease progresses. In short: "Off" - 1. the medications are not being effective. 2. PD symptoms predominate. 3. The PWP is slow, freezes, is prone to fall, has tremor, experiences rigidity etc. 4. The severity of the PD symptoms varies from mild to extreme depending on the stage to which the disease has progressed. "On" - 1. the medications are being effective. 2. The PWP moves more freely (hence your associating "On" with movement), tremor and rigidity are significantly reduced. 3. As the disease progresses the "On" periods tend to shorten and can involve medication related side affects. Hope this is some help. Dennis. ++++++++++++++++++++ Dennis Greene 47/10 [log in to unmask] http://members.networx.net.au/~dennisg/ ++++++++++++++++++++