When does our brain work the best in the day?
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Monash economist Denni Tommasi and University of Granada economist Alessio Gaggero examined five years’ worth of tests taken by STEM students in the UK and came to the conclusion that our brains work best in the middle of the day - if asked to perform abstract, logical or problem-solving tasks. Their research was published in a working paper by the IZA Institute of Labor Economics, a non-profit research institute based in Germany.
Having studied the results of exams scheduled at 9 am, 1:30 pm and 4:30 pm, Tommasi and Gaggero’s findings suggested the cognitive peak happened in the middle of the day – on average, STEM students performed best in the 1:30 pm exam.

Why 1:30 pm specifically?
Chronobiologists, who specialise in circadian rhythms, say it’s because that’s when the “fluid” intelligence used in problem-solving, logic and abstract reasoning is at its daily peak. Fluid intelligence is used by surgeons, data analysts, those coding software etc. We also employ it during meetings when we’re required to respond to various – sometimes conflicting – points of view.
The time-of-day advantage was only apparent in science, technology, engineering and math exams, but not in humanities subjects. Humanities students are more likely to utilise crsytallised intelligence which depends on language skills and cultural knowledge.
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