Task-invoked pupillary response

Task-invoked pupillary response (also known as "Task-Evoked pupillary response") is a pupillary response observed after an increase in cognitive load in humans, as a result of the subsequent decrease in parasympathetic activity in the peripheral nervous system. As a task places increased demand on working memory, pupil dilation has been observed to increase linearly. Jackson Beatty evaluated task-invoked pupillary response in different tasks for short-term memory, language processing, reasoning, perception, sustained attention, and selective attention, and found that this reaction fulfills Daniel Kahneman's three criteria for indicating processing load. That is, it can reflect differences in processing load within a task, between different tasks, and across individuals. It is used as an indicator of cognitive load in psychophysiology research.

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