a symptom of schizophrenia that represents an excess or distortion of normal function, as distinct from a deficiency in or lack of normal function (compare negative symptom). Positive symptoms include delusions or hallucinations, disorganized behavior, and manifest conceptual disorganization. They are more dramatic and less distinctive of schizophrenia than are negative symptoms: Eugen Bleuler regarded them as secondary symptoms. See positive schizophrenia.