additive effect

additive effect

n.

An effect in which two substances or actions used in combination produce a total effect the same as the sum of the individual effects.

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additive effect

Etymology: L, additio, something added, effectus

the combined effect of drugs that, when used in combination, produce an effect that is greater than the sum of their separately measured individual effects.

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effect

a result produced by an action. The relationship between the two can be expressed in linear form. The total association between them may be the sum of a number of effects. The effect may be direct when it is exerted without being transmitted through intervening factors, or indirect when it is. It may also be a spurious effect when the observed changes are due to causes and correlations common to both.

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additive effect

the combined effect produced by the action of two or more agents, being equal to the sum of their separate effects.

Coolidge effect

the stimulation of sexual behavior in a male animal upon exposure to a new female.

cumulative effect

cumulation action.

experimenter e's

demand characteristics; the characteristics supplied by the experimental subject in response to what it perceives are the demands of the experimenter.

effect modifier

a factor which modifies the effect of a causal factor under study. Called also interaction.

position effect

in genetics, the changed effect produced by alteration of the relative positions of various genes on the chromosomes.

pressure effect

the sum of the changes that are due to obstruction of tissue drainage by pressure.

side effect

a consequence other than that for which an agent is used, especially an adverse effect on another organ system.