Measuring the dilation of a person's pupil to measure attention to an advertisement is a technique used in:

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Measuring the dilation of a person's pupil to measure attention to an advertisement is a technique used in observational research. This type of research involves observing and recording the behavior and responses of individuals without manipulating any variables. Pupil dilation is a physiological response that can indicate a person's level of interest or attention, making it a useful tool for observational research.

Measuring the Dilation of a Person's Pupil to Measure Attention