This is, I assume, the first neuropsychological test to appear on a bog roll. The ‘Mind Trainer Toilet Roll‘ has a different puzzle on each sheet and it includes the Stroop test, one of the most studied tests in cognitive science.
This means you’ll never be without the opportunity to measure attentional inhibition of automatic cognitive processes in the bathroom.
Now if only I could get a bidet that measured working memory, my life would be complete.
Link to Mind Trainer Toilet Roll.
Link to Wikipedia page on the Stroop effect (via @jonmsutton)