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http://www.amsciepub.com/doi/abs/10.2466/pms.1973.37.3.1000
http://www.amsciepub.com/doi/pdf/10.2466/pms.1973.37.3.1000
Poock (1973) reported that when participants’ minds were loaded to 125% of their capacity, their pupils constricted.
The effects of information processing on pupil diameter were investigated. Results showed that pupil diameter was significantly greater than a baseline diameter when Ss were required to process information at 75 and 100% of their maximum capacity. However, when Ss were required to process information at a rate above their maximum capacity, the pupil constricted significantly below the baseline diameter. Pupil diameter may be a parameter which would identify points in time where mental overload occurs in a worker's job, and therefore identify areas of the job which should be redesigned if one wished to reduce mental overload.