In an experiment, either a sad video or a happy video was shown to participants to influence their moods. The participants were then asked to memorize a list of words. Later, the participants were again shown either the same video they had seen before memorizing the words or they were shown the other video, and they were then asked to recall the words they had memorized previously. The results of the experiment, summarized in the chart above, best illustrate which psychological concept?

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