Signal Detection Theory is a concept used in psychology to analyze an individual's ability to differentiate between a signal and noise in the environment. The theory has several synonyms, including Detection Theory, Signal Detection Model, and Sensation Discrimination Theory. These terms are all used interchangeably and describe the same thing. The primary purpose of the Signal Detection Theory is to explain how an individual processes inputs/signals and how they relate to a certain stimulus. This theory has essential applications in different fields, including medicine, engineering, education, and communication. By understanding the synonyms of this theory, researchers and students can gain a better understanding of its meaning, purpose, and applications in science and technology.