• Adam Szulewski, Nathan Roth, and Daniel Howes.
• A. Szulewski is a senior resident and resuscitation and reanimation medicine fellow, Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada. N. Roth is a senior medical student, School of Medicine, Queen's University, Kingston, Ontario, Canada. D. Howes is associate professor, Department of Emergency Medicine and Critical Care Program, Queen's University, Kingston, Ontario, Canada.
• Acad Med. 2015 Jul 1; 90 (7): 981-7.

PurposeTask-evoked pupillary responses (TEPRs), or changes in pupil size, correlate with changes in cognitive processing demands. The magnitude of this change is a reliable marker of cognitive load. The authors used TEPRs to compare cognitive load between novices and trained physicians as they answered clinical knowledge questions.MethodIn 2013, 20 emergency medicine trainees were recruited and divided into novice (n = 10) and trained physician (n = 10) groups. The authors used mobile eye-tracking glasses to assess changes in pupil diameter as participants answered arithmetic questions, general knowledge questions, and clinical emergency medicine questions in a controlled setting. Questions were categorized by difficulty a priori.ResultsDifficult arithmetic questions caused greater changes in TEPRs than easy ones (P = .024). TEPRs were similar between groups when answering general knowledge questions (P = .383) but were significantly greater for novices than trained physicians when answering clinical questions (P < .001). TEPRs in trained physicians were significantly greater when answering difficult clinical questions than easy ones (P < .001), whereas TEPRs in novices were similar (P = .291). For those clinical questions answered correctly by both groups, TEPRs in novices were greater than those in trained physicians despite all participants answering correctly (P < .001).ConclusionsNovices require more mental effort to answer clinical questions than trained physicians, even when both respond correctly. Measuring TEPRs has the potential to be a valuable assessment tool by providing objective measures of expertise and is worthy of further study.

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