Answer:
Priming
Step-by-step explanation:
Priming is a technique where exposure to one thing can alter behavior or thoughts. This occurs by exposure to a stimuli influences the response of a subsequent stimuli.
The participants were asked to identify red object on a video screen therefore when shown new objects of various colors on the screen it was easier for them to identify red objects. It is due to initial exposure of stimuli to red color that leads to subsequent stimuli to recognize red more easily.