Carlsson et al. (2000) relied on secondary data, including animal studies, to formulate their glutamatergic hypothesis of schizophrenia.
Suggest one modification to the design of this study that would address a limitation of using secondary data, and explain how this modification would improve the validity of their conclusions.
18 exam-style questions on Edexcel A Level Psychology Studies, covering Classic study: Rosenhan (1973), Contemporary study (schizophrenia): Carlsson et al., Contemporary study (depression): Kroenke et al., Contemporary study (depression): Williams et al., Contemporary study (anorexia): Scott-Van Zeeland et al., Contemporary study (anorexia): Guardia et al., Contemporary study (OCD): Masellis et al., and Contemporary study (OCD): POTS team / March et al.. Each one has a worked solution and a mark scheme showing where the marks go.