Here's what happens to our eyes when we engage our imagination, writes ckbergland
to visualize"dark" or"bright" mental images in their mind's eye, it can change pupil size—even if the amount of light hitting the retina stays the same. These findings by researchers at the University of New South Wales were published on March 31 in the peer-reviewed journalIn a first-of-its-kind discovery, the UNSW researchers found that the vividness of someone's mental imagery correlates with changes in pupil size or lack thereof.
Looking at glaringly bright shapes caused everyone's pupils to constrict and get smaller. Conversely, looking at dark objects caused pupillary dilation, making pupils bigger. Notably, study participants with aphantasia and non-aphantasic people had the same pupillary response under these conditions.
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