Leveraging data complexity: Pupillary behavior of older adults with visual impairment during HCI
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This paper presents a case study to introduce a newtechnique for identifying and comparing cognitivestrategies. The technique integrates eye movements withthe Index of Cognitive Activity, a psychophysiologicalmeasurement of cognitive workload derived from changesin pupil dilation. The first part of the paper describes thetechnique and its constituent elements. The second partdescribes the task used in this study. The task has beenused extensively in previous studies withelectrophysiological recordings of EEG, EOG, and EMGand is know to elicit different levels of cognitiveworkload. The third part of the paper shows the resultsand provides detail about three separate strategies thatemerged in the subject's performance. The strategies arefirst identified from differences in the Index of CognitiveActivity and corroborated through detailed analyses ofthe participant's eye movements as he performed the task.