Positive Symptoms: Sypmtoms that involve a sort of excess including: hallucinations, delusion and catatonia.
Negative Symptoms: Symptoms that involve a sort of lacking including: affective flattening, lack of emotion in the voice/face, alogia which is a lack of coherent sentences and avolition which is a lack of goal directing behaviour.
Issues Surrounding DIagnosis -
The DSM IV/V was last published in 1994, and is widely used around the world. (DSMV=2013).
ICD10. This isn't used as widely used in the UK, mainly used in Europe. When each of these are used diagnosis will differ as they're different diagnostive material.
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