Mental effort is measurable

August 18, 2012

(Eckhard) Hess had noticed that the pupils are sensitive indicators of mental effort – they dilate substantially when people multiply two-digit numbers, and they dilate more if the problems are hard if than are easy.”

Kahneman 2012, p.32

Jeff Klinger explored how to determine the level of cognitive load (= mental effort) of visual interfaces in his PHD thesis: ‘Measuring Cognitive Load During Visual Tasks by Combining Pupillometry and Eye Tracking’

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