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This is discussed in the article, where they used this fact to affirm that aphantastic individuals are indeed attempting to visualize (and failing), vs. simply not attempting. Moreover, they explain that in those who can visualize, pupils both dilated and contracted appropriate to the visualization.

Oh, thanks. I guess I judged too quickly.

Anecdotally I just tried recording a video of my eyes and started doing calculations in my head, but no dilation in my eyes when watching the recording. Could be my concentration just sucks.

Or it the calculations were easy for you.

Cool. Just like they mentioned in the article!