Why Our Brains Wear Out at the End of the Day

, your weekly dose of commentary on a new medical study. I'm Dr F. Perry Wilson of the Yale School of Medicine." that just came out. It tries to answer the question of why our brains wear out. I'm going to put myself in the corner here. Let's walk through this study, which appears inThe big question is what's going on with cognitive fatigue.

The first is performance decrement. Did they get it wrong? What percentage of the time did the participant say"consonant" when they should have said"lowercase"?You can see here that the hard group did a little bit worse overall. It was harder, so they don't do as well. That makes sense. But both groups kind of waned over time a little bit. It's not as though the hard group declines much more. The slopes of those lines are pretty similar.

So far there isn't a robust readout that would make us say, oh, yeah, that is a good marker of cognitive fatigue. That's how you measure cognitive fatigue. It's not what people say. It's not how quick they are. It's not even how accurate they are. It would be nice to have some objective physiologic measurements for this, and they do. This is pupil dilation.When you're paying attention to something, your pupils dilate a little bit. They were able to show that as the hard group became more and more fatigued, pupil dilation sort of went away. In fact, if anything, their pupils constricted a little bit. But basically there was a significant difference here. The easy group's pupils were still fine; they were still dilating.

fperrywilson Always better to “sleep on it”…

fperrywilson No wonder my Amazon bill is always high.

fperrywilson 🤔

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