A researcher is studying the effects of reward on cognitive performance using a within-subjects design. All participants first completed a control condition in which they solved math problems with no reward. They then completed an experimental condition in which they were paid $1.00 for each problem solved correctly. Participants correctly solved more problems in the experimental condition than in the control condition. A possible problem with this study is a ________ effect.
A) practice
B) fatigue
C) carry-over effect
D) sensitization

Question

Quizplus · Accepted Answer

Participants may have improved their performance in the experimental condition due to having practiced the math problems in the control condition, rather than the effect of the reward itself.

A Researcher Is Studying the Effects of Reward on Cognitive