The Zigoni effect refers to the phenomenon that the unfinished work has a better memory effect than the completed work.It was discovered in 1927 by the German psychologist Zigoni in a memory experiment.
In order to wake up the husband who loves to sleep, the wife kept playing the first three chords of a set of phrases on the piano. After listening, the husband tossed and turned, and finally had to get up and played the last chord belong to the Zigoni effect.