The Index of Cognitive Activity: measuring cognitive workload

By S. Marshall. Proceedings of the IEEE 7th Conference on Human Factors and Power Plants, 2002

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Pupillometry in Infancy Research (2016, background): “Similarly, changes in pupil dilation have been studied as a kind of cognitive index to measure mental workload (Marshall, 2002).”
Estimating cognitive load using remote eye tracking in a driving simulator (2010, methodology): “While head-mounted eye trackers are useful for precise eye measures, they are impractical in consumer driving environments and can also affect the results of the experiments [Marshall 2002]. Thus researchers have turned to remote eye tracking in cars to infer the cognitive load of the driver. Recart”
Understanding changes in mental workload during execution of goal-directed tasks and its application for interruption management (2008, methodology): “Under conditions of controlled illumination, research shows that pupil dilation is a valid and reliable indicator of mental workload [Beatty 1982; Hess and Polt 1964; Hoecks and Levelt 1993; Juris and Velden 1977; Kahneman 1967; Marshall 2002; Nakayama and Takahashi 2002; Takahashi et al. 2000].”