PCP acutely induces a psychotic state in which one becomes withdrawn, autistic-like, negativistic, and unable to maintain a cognitive set, and manifests concrete, impoverished, idiosyncratic, and bizzare responses to proverbs and projective testing. Some people show catatonic posturing. These schizophrenic-like alterations in brain functioning goes beyond the symptom level; any person under the influence of even a small amount of PCP will have profound alterations of higher emotional functions affecting judgement and cognition.