A neuroscientist wants to investigate the effect of caffeine on motor coordination.
On Day 1, a group of 24 healthy volunteers are given a decaffeinated placebo drink and their reaction times are measured using a standard button-pressing task.
On Day 2, the same 24 volunteers are given a caffeinated drink containing 150 mg of caffeine and their reaction times are measured using the same task.
Identify the experimental design used in this study. Justify your answer.
Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
