Involuntary Movement

What are the medical and cognitive differences beween twitches, spasms and tics?

[ILADVOCATE]

Having tardive tourretism among the many advanced variants of tardive dyskinesia I have I would say a twitch is a brief movement. A spasm is more prolonged. A tic has an element of compulsion to it and is part of Tourettes. Tourette's Syndrome can be associated with ocd which is of course psychiatric. Unless there are extreme involuntary movements such as advanced Parkinsonism in myself (which is under clinical study) there is generally not a loss in cognition.