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What is the name of the law and the equation that says that "the more time an organism is working the slower (or less precise) its movements." ?

I read once that there is a law in behavioral science that says that: "The more an organism is doing something(working) the slower its movements are (or less precise, can't remember exactly).". That law also has equation that describes it. I need to know the name of that law.

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up vote 2 down vote accepted

Your question is a bit vague, but it sounds like you might be looking for Hick's Law. Hick's law states the relationship between the number of possible responses that an organism can provide for a given task and the minimum time necessary to engage a response.

You may have also been thinking of one of the computational models for two-alternative forced-choice tasks (2AFC).

Let me know if any of this rings a bell!

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