Practice Effects
Practice effects occur when a participant in an experiment is able to perform a task and then perform it again at some later time. Generally, they either have a positive (subjects become better at performing the task) or negative (subjects become worse at performing the task) effect. Repeated measures designs are almost always affected by practice effects; the primary exception to this rule is in the case of a longitudinal study. How well these are measured is controlled by the exact type of repeated measure design that is used.
Both types, however, have the goal of controlling for practice effects.
Read more about this topic: Carryover Effect
Famous quotes containing the words practice and/or effects:
“It is not always possible to predict the response of a doting Jewish mother. Witness the occasion on which the late piano virtuoso Oscar Levant telephoned his mother with some important news. He had proposed to his beloved and been accepted. Replied Mother Levant: “Good, Oscar, I’m happy to hear it. But did you practice today?””
—Liz Smith (20th century)
“Virtues are not emotions. Emotions are movements of appetite, virtues dispositions of appetite towards movement. Moreover emotions can be good or bad, reasonable or unreasonable; whereas virtues dispose us only to good. Emotions arise in the appetite and are brought into conformity with reason; virtues are effects of reason achieving themselves in reasonable movements of the appetites. Balanced emotions are virtue’s effect, not its substance.”
—Thomas Aquinas (c. 1225–1274)