Given how many of us listen to music while studying or doing other cerebral work, you’d think psychology would have a set of clear answers as to whether the practice is likely to help or hinder performance. In fact, the research literature is rather a mess (not that that has deterred some enterprising individuals from making bold claims).

There’s the largely discredited “Mozart Effect”—the idea that listening to classical music can boost subsequent IQ, except that when first documented in the 90s the effect was on spatial reasoning specifically, not general IQ. Also, since then the finding has not replicated, or it has proven weak and is probably explained as a simple effect of music on mood or arousal on performance. And anyway, that’s about listening to music and then doing mental tasks, rather than both simultaneously. Other research on listening to music while we do mental work has suggested it can be distracting (known as the “irrelevant sound effect”), especially if we’re doing mental arithmetic or anything that involves holding information in the correct order in short-term memory.

Now, in the hope of injecting more clarity and realism into the literature, Manuel Gonzalez and John Aiello have tested the common-sense idea that the effects of background music on mental task performance will depend on three things . . .

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