Answer: REACTIVITY
Explanation: Reactivity in Psychology occurs when an individual responds to situations differently due to their knowledge of the fact that they are being carefully viewed with attention to detail. This changes can either be positive or negative depending on the individual and the situation.
An example can be an athlete that is aware that scouts are present in a game. This athlete will try their best to impress the scouts. Sometimes due to anxiety and nervousness of the awareness of the scout, the athlete may flop for that particular game.