"Negative symptoms": conceptual and methodological problems.

  title={"Negative symptoms": conceptual and methodological problems.},
  author={A A Sommers},
  journal={Schizophrenia bulletin},
  volume={11 3},
Research into the so-called negative symptoms of schizophrenia is plagued by often ignored problems in item identification, scale selection, quantification, clinical assessment process, and symptom (and, probably, causal) nonspecificity. Neither a negative symptom syndrome per se nor the recent rating scales designed to measure it have been validated, although some data useful in this regard have been presented for the scales. Since no criterion against which to validate these scales exists… CONTINUE READING

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