1. A computerized system comprising: an interface arrangement for interfacing a data source, said data source delivering data related to head motion of a person under influence of drugs; a memory arrangement for storing said data; a processor for processing said data; an artificial neural network (ANN) using said processor; means for collecting a second set of data from said person, said data being collected under influence of a drugs; means for calculating one or several parameters distinctive of various features of said person; and means for feeding said parameter values to said ANN trained to recognize said various features, comprising psychological syndromes.