When studying the role of dopamine in schizophrenia, scienti…

When studying the role of dopamine in schizophrenia, scientists found that drugs like amphetamines increase the amount of dopamine released into synapses and produce effects similar to symptoms of schizophrenia. They also found that drugs like chlorpromazine, which block dopamine from binding to receiving neurons, reduce the symptoms of schizophrenia. What can be concluded based on these two findings?