Complex tics typically last longer, sometimes over a second, and are usually a combination of simple tics, like shaking one’s head while shrugging their shoulders.
Complex motor tics can also include echopraxia, which is a tic-like repetition of the movements of others, as well as copropraxia—tics involving obscene gestures.
The results showed that one algorithm, in particular, the Extreme Gradient Boosting Model, may be better at identifying Alzheimer's than the more traditionally used TICS.