We all have days when we feel like our brain is going at a snail’s pace, when our neurons forgot to get out of bed. And psychologists have shown that IQ can fluctuate day to day. So if we’re in good health and don’t have a sleep deficit from last night’s shenanigans to blame, what’s the explanation?
Sophie von Stumm, a psychologist at Goldsmiths University, London, set about finding out. In particular, she wanted to know whether mood might explain the brain’s dimmer switch.
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