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Title:Towards an Index of Opportunity: Understanding Changes in Mental Workload during Task Execution
Author(s):Iqbal, Shamsi T.; Adamczyk, Piotr D.; Zheng, Xianjun S.; Bailey, Brian P.
Subject(s):Human-computer interaction
Abstract:To contribute to systems that reason about human attention, our work empirically demonstrates how a user's mental workload changes during task execution. We conducted a study where users performed an interactive hierarchical task and measured mental workload through the use of pupil size. Results show that (i) different types of subtasks impose different mental workload, (ii) workload decreases at subtask boundaries, (iii) workload decreases more at higher level boundaries and less at lower level boundaries, (iv) workload changes among subtask boundaries within the same level of a task model, and (v) effective understanding of why changes in workload occur requires that the measure be tightly coupled to a validated task model. We offer an Index of Opportunity that maps a user's mental workload to the disruptive impact of an interruption. This mechanism can help systems better compute the cost of interruption.
Issue Date:2004-04
Genre:Technical Report
Rights Information:You are granted permission for the non-commercial reproduction, distribution, display, and performance of this technical report in any format, BUT this permission is only for a period of 45 (forty-five) days from the most recent time that you verified that this technical report is still available from the University of Illinois at Urbana-Champaign Computer Science Department under terms that include this permission. All other rights are reserved by the author(s).
Date Available in IDEALS:2009-04-14

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