Dictionary of Human Evolution and Biology

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1. that value at which a stimulus just produces a sensation, is just appreciable, or comes just within the limits of perception.

2. a hypothetical barrier that stimuli must pass to be detected; see threshold limit value.

3. that degree of concentration of any of specific substances (threshold substances) in the blood plasma above which the substance is excreted by the kidneys and below which it is not excreted.

4. the minimum level of input required to cause some event to occur.

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