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What this tells us is that added music hurts learning. Even very low-level music can cause problems. People performed significantly better when they studied animations without background music. The reason is clear: Music (even low-level music) adds harmful cognitive load. As the two authors wrote in their report, “auditory adjuncts can overload the learner's auditory working memory”. They said that this result is expected, given what we know about perception, memory, and other cognitive processes.
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