validity of schizophrenia as a homogenous disorder

can be used as part of an answer to the issues surrounding the classification and diagnosis of schizophrenia including reliability and validity

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Psychology unit 4 revision (schizophrenia)
Issues surrounding the classification and diagnosis of schizophrenia including
reliability and validity: validity of schizophrenia as a homogenous disorder
Currently treated as 1 single disorder. DSM lists different types of
schizophrenia but these are thought to be variations of the same disorder,
however this may be wrong as there is evidence that suggests schizophrenia
is actually a collection of different mental illnesses.
Firstly, historically the types of schizophrenia were seen as different
mental illnesses. The Greeks said there were 4 types of mental illnesses
that today we would classify as schizophrenia. It wasn't until 1878 that
these were grouped together and called Dementia Praecox.
Different types of schizophrenia and their symptoms can be different. For
example the dopamine explanation explains the positive symptoms and large
ventricles explains the negative symptoms. The different causes indicate
there may be more than 1 type of schizophrenia so it's wrong to group them
together.
Predictive validity suggests that 10% of schizophrenics will die whereas
20% will make a full recovery and the large range of outcomes suggests
that these are different mental illnesses causing different outcomes.
Psychiatrists will diagnose patients with either type 1 or 2 schizophrenia.
This suggests there are 2 main types of mental illnesses which are commonly
called schizophrenia.

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