That is, it indicates how fast the individual can execute the mental operations needed by the task at hand.In turn, speed of processing is considered an index of processing efficiency.

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This supported the idea that a subject did a serial exhaustive search through memory rather than a serial self-terminating search.

Shepard and Metzler (1971) presented a pair of three-dimensional shapes that were identical or mirror-image versions of one another.

Reaction time to determine whether they were identical or not was a linear function of the angular difference between their orientation, whether in the picture plane or in depth.

They concluded that the observers performed a constant-rate mental rotation to align the two objects so they could be compared.

Taking the mean of the raw response time is rarely an effective method of characterizing the typical response time, and alternative approaches (such as modeling the entire response time distribution) are often more appropriate.

Sir Francis Galton is typically credited as the founder of differential psychology, which seeks to determine and explain the mental differences between individuals.

The subject then answered as quickly as possible whether the probe was in the previous set of digits or not.

The size of the initial set of digits determined the reaction time of the subject.

Mental chronometry is the use of response time in perceptual-motor tasks to infer the content, duration, and temporal sequencing of cognitive operations.