Stimulus information as a determinant of reaction time.

@article{Hyman1953StimulusIA,
  title={Stimulus information as a determinant of reaction time.},
  author={Ray Hyman},
  journal={Journal of experimental psychology},
  year={1953},
  volume={45 3},
  pages={
          188-96
        }
}
  • R. Hyman
  • Published 1 March 1953
  • Psychology
  • Journal of experimental psychology
In the typical reaction-time experiment, S's reaction time is greater when he has to respond differentially to one of two equally probable stimuli instead of to just one stimulus. In fact, Merkel (2), using one to ten alternatives, has demonstrated that when S has to respond to one stimulus chosen from a number of equally probable alternatives, his reaction time increases with the number of alternatives. The fact that S's response to stimulus A takes more time when A is one of several rather… 

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References

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On the Rate of Gain of Information

TLDR
The principal finding is that the rate of gain of information is, on the average, constant with respect to time, within the duration of one perceptual-motor act, and has a value of the order of five “bits” per second.