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.
(d) additive effect on current of response, root-tip a negative, and growing region A positive.
It is, however, better to employ the additive effect of a definite number of feeble make-and-break shocks.
The additive effect of stimulus of light and gravity is seen illustrated in figure 180.