Which of the following statements reflects circumstantial evidence for the dopamine theory of schizophrenia?
a. Antipsychotic drugs (neuroleptics) act as dopamine agonists, increasing the amount of dopamine in the brain.
b. Antipsychotic drugs (neuroleptics) can produce symptoms similar to those of Parkinson's disease (a disorder due to insufficient dopamine).
c. The drug L-dopa, a dopamine agonist, is used to treat schizophrenic symptoms in patients with Parkinson's disease.
d. Amphetamines, which activate dopamine, can lessen psychotic symptoms in people with schizophrenia.
Question 2
When looking for abnormalities in the brain as clues to the influences of schizophrenia in correlational research, it is important to keep certain questions in mind. For example, if a person with schizophrenia were found to have an excess of dopamine, a researcher would need to ask all of the following questions EXCEPT:
a. Does too much dopamine cause schizophrenia?
b. Does having schizophrenia cause an excess of dopamine?
c. Is there some factor that causes both schizophrenia and an excess of dopamine?
d. Why is the dopamine system active in the schizophrenic brain?
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