examined deceased schizophrenic patients had higher levels of dopamine
Causation?
it is impossible to determine cause and effect there may be other extraneous variables.
Extraneous variables?
there are other factors that can affect behaviours such as: medication, age and length of time between death and examination
strength?
provides detailed anatomical structure and neurochemical aspects. can access areas such as the hypothalamus and hippocampus
weakness?
procedure is invasive. ethical issues with informed consent. e.g., patient HM who suffered from severe amnesia unable to provide fully informed consent
