Daniel et al. (1991) found that participants diagnosed with schizophrenia performed better on a cognitive task after receiving amphetamine than after receiving a placebo. Amphetamine increases dopamine activity. A community mental health rehabilitation service concludes from this finding that increasing dopamine activity would improve everyday planning in all people diagnosed with schizophrenia.
Using your knowledge of how Daniel et al. carried out their study, describe two reasons why the service should be cautious about this conclusion.
Explain which of the two reasons you gave in (a) is the greater problem for the service's conclusion.
144 exam-style questions on OCR GCSE Psychology 3.2 Theories/Explanations, covering 3.2.1 Clinical characteristics of schizophrenia, 3.2.2 Key statistics of schizophrenia, 3.2.3 Dopamine hypothesis of schizophrenia, 3.2.4 Brain structure and function in schizophrenia; criticisms, 3.2.5 Social drift theory of schizophrenia, 3.2.6 Schizophrenia research study: Daniel et al. (1991), 3.2.7 Clinical characteristics of clinical depression, 3.2.8 Key statistics of clinical depression, 3.2.9 Social rank theory of clinical depression, 3.2.10 ABC Model of clinical depression, and 3.2.11 Clinical Depression research study: Tandoc et al. (2015). Each one has a worked solution and a mark scheme showing where the marks go.