A researcher is evaluating the methodology used by Casey et al. (2011) in their study on the neural correlates of delay of gratification.
Identify the independent variable (IV) in this study and explain why its nature means the study is classified as a quasi-experiment rather than a true experiment.
39 exam-style questions on OCR A Level Psychology Regions of the brain, covering Sperry (1968): Split brain study and Casey et al. (2011): Neural correlates of delay of gratification. Each one has a worked solution and a mark scheme showing where the marks go.