Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

n. the possibility that effects gained from a previous treatment may still be present and, therefore, be carried over in the next treatment. Also, that the current performance of a participant may be affected by the experimental conditions which preceded the current one.

CARRYOVER EFFECT: "The carryover effect is a factor to be considered in the before and after design of a research or experiment."

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