The concept of hallucination.
D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006212:Hallucinations / Q000175:diagnosis*; D006801:Humans; D007092:Imagination; D008297:Male; D008875:Middle Aged; D010465:Perception; D012559:Schizophrenia / Q000175:diagnosis; D012565:Schizophrenic Psychology