Chronometric absolute dating techniques are based on

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.Despite this, Donders' theories are still of interest and his ideas are still used in certain areas of psychology, which now have the statistical tools to use them more accurately. The experiment measured the subject's reaction time based on number of possible choices during any given trial.Hick showed that the individual's reaction time increased by a constant amount as a function of available choices, or the "uncertainty" involved in which reaction stimulus would appear next.

In turn, speed of processing is considered an index of processing efficiency.

This method provides a way to investigate the cognitive processes underlying simple perceptual-motor tasks, and formed the basis of subsequent developments.

Although Donders' work paved the way for future research in mental chronometry tests, it was not without its drawbacks.

This phenomenon is called "Hick's law" and is said to be a measure of the "rate of gain of information".

The law is usually expressed by the formula Hick's law has interesting modern applications in marketing, where restaurant menus and web interfaces (among other things) take advantage of its principles in striving to achieve speed and ease of use for the consumer.

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