Hallucinations and illusions Behavior and Behavior Mechanisms 1 Collective behavior 1 Crowds 1 Delusions 1 Diseases 1 Hallucinations 1 Hallucinations - etiology 1 Hallucinations -- etiology 1 Health & Biological Sciences 1 Mental Disorders 1 Nervous System Diseases 1 Neurobehavioral Manifestations 1 Neurologic Manifestations 1 PSYCHOLOGY 1 Pathological Conditions, Signs and Symptoms 1 Perceptual Disorders 1 Psychiatric Disorders, Individual 1 Psychiatry 1 Psychoses 1 Psychotic Disorders 1 Psychotic Disorders - therapy 1 Psychotic Disorders -- therapy 1 Schizophrenia and Disorders with Psychotic Features 1 Signs and Symptoms 1 Social psychology 1