What effect occurs when there is a deterioration in participant performance due to repeated testing?

The phenomenon referred to as the Fatigue Effect describes a decline in participant performance that can occur when individuals are subjected to repeated testing. This occurs because, as participants engage in the same or similar tasks multiple times, they may experience increased tiredness or boredom, leading to diminished motivation and concentration. The fatigue can adversely impact their ability to perform accurately or effectively, which is why this answer is considered correct.

In comparison, the Transfer Effect typically involves the influence of previous experiences or skills affecting performance on a subsequent task, potentially leading to improved outcomes rather than deterioration. The Improvement Effect suggests that repetition can lead to better performance due to practice, which contradicts the premise of the question, as it implies enhancement rather than deterioration. The Enhanced Performance Effect similarly suggests that individuals might exhibit improved performance due to motivation or external influences, which is not applicable in the context of repeated testing causing decline. The choice of Fatigue Effect best encapsulates the idea of performance deterioration due to the demands placed on participants by repeated assessments.