Signal Detection Theory

Definition

A theory predicting how and when we detect the presence of a faint stimulus (signal) amid background noise (other stimuli). It involves decision-making processes as well as sensory processes.

Related terms

False Alarm: In signal detection theory, this refers to an instance where one perceives a signal when none was present.

Hit Rate: The rate at which true signals are detected correctly in signal detection theory.

Discrimination Threshold: The smallest difference between two stimuli that can be consistently detected.