I'm asking this because every individual perceives task demand differently. Hence, a varying task difficulty for the different levels of demand. But, Is there any valid relationship between task demand and changes to pupil diameter.
From a few driving simulator experiments, I found that the workload obtained from the NASA-TLX and that obtained through TEPR (eye tracker) are not similar. It is almost as if the NASA-TLX and eye tracker follow a different approach in measuring workload (one focuses on demand/difficulty (subjective to participant interpretation) and the other on difficulty solely (eye tracker)). Am I missing something crucial about these measures of Workload?
Thank you for any guidance on this.
Estimates in workload taken from eye-tracking measures (blink rate, pupil dilation) might differ from subjective ratings for a number of reasons.
One may be that the task is highly visually demanding but not particularly cognitively demanding or vice versa. Were there any other demands on participants which may have resulted in these measures being different? Were the lighting conditions similar between conditions? For example, were participants driving in different scenarios (night and day?).
If you suspect it might be lighting conditions, you may want to read.
https://www.medien.ifi.lmu.de/pubdb/publications/pub/pfleging2016workload/pfleging2016workload.pdf
A paper you should definitely read is Recarte 2008, which is an older paper, but highly cited in these types of discussions.
https://pdfs.semanticscholar.org/ca0b/80a8183fcab4e02c260e86d24cff1c8b8c13.pdf
It's also discussed in this paper.
Conference Paper Estimating cognitive load using remote eye tracking in a dri...
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