In this paper we present preliminary results about on-line drawings acquired by means of a digitizing tablet, and performed by control population (left and right hand) as well as pathological subjects using their dominant hand. Experimental results reveal a clear difference between both groups, specially on the on-air movements. Although the acquired samples are not enough to extract significant conclusions we think that this preliminary results encourage the experimentation in this research line. Thus, the main purpose of this paper is to attract the attention of the scientific community.