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Some class periods seems to zip by whereas others seem to go on forever.
The same actual amount of time can be perceived to move slowly or quickly. One of the factors that can influence the perception of time is the complexity of the stimulus that we are experiencing during that time. Yeager had one group of participants listen to familiar melodies and another group listen to the same melodies played backwards. The participants in the backwards melodies group rated the music as more complex and the time period as longer than the participants listening to the forward melodies. Yeager concluded that increases in complexity cause increases in time perception.