Abstract: The relation between time needed for simple reaction and intensityof stimulation was formerly derived from an assumed mathematicalmodel similar to that of the process of learning or growth. However, theequation so derived often fails to fit in with experimental data, showingthat the traditional theory was quite untenable. This paper applies the author's model of stimulation and effect,resulting in an equation which reasonably agrees with experiments, afact confirming this new model in a more general sense. Inspection of the derived equation gives evidence that a durationabout 40-60 ms is probably indispensable for the brain to accumulateenough energy to set up a commanding nervous impulse for anyphysical reaction.

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