theory predicts how and when we detect the presence of a faint stimulus. Assumes that there is no single absolute threshold and that detection depends partly on a person’s experience, expectations, motivation, and level of fatigue.

Signal detection theory

Explanation:

Signal detection theory predicts the relationship of how well a signal is detected and the psychological state of the observer. This theory evaluates how and when the presence of a faint stimulus ("signal") amid background stimulation ("noise") is detected. Assumes that there is no single absolute threshold and that detection depends partly on a person's experience, expectations, motivation, and level of fatigue