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It is one of the branches of classical theoretical psychology, which appeared before the emergence of psychology in 1879, where this science appeared in 1861,.

It expresses the complementary relationship between a person’s perception of sensory signals on the one hand, And the standard of decision-making has on the other.

•the standard of balanced resolution with respect to signal and noise, It aims to reduce the total number of errors.

The amount of stimulus that causes a barely noticeable sensation, loss or altered sensations.

The second stage of the cognitive process, which consists in identifying specific features of the stimulus and forming a standard perceptual image based on them.