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The mind's eye: Pupil size may be indicator of aphantasia

the University of Sussex
Medical News Today
the University of Groningen
the University of California
the University of Chicago
Edge Hill University
the University of Edinburgh
Miami University
the University of Exeter
National Storytelling Laureate

Julia Simmer
Sebastiaan Mathot
Nicholas Davidenko
Wilma A. Bainbridge
Reshanne Reeder
Sergio Della Sala
Joseph Johnson
Adam Zeman
Katrice Horsley

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the moon

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Santa Cruz
the United Kingdom

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Positivity     35.00%   
   Negativity   65.00%
The New York Times
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For most people, visual brain areas are also involved in mental imagery, thus resulting in pupil responses, especially when contrasting imagery of bright and dark things.”“However, for people with aphantasia, these areas may not be involved in imagery, or less so, resulting in an absent or reduced effect of mentally imagining bright and dark things on the pupil light response,” he added.The researchers also noted that pupil diameter may be encoded along with original visual information for bright objects and is thus replayed during memory decoding. “Here, a significant group difference is reported, but just over 60% of people with aphantasia show a pathological response to the pupillary test,” Dr. Sergio Della Sala, professor of human cognitive neuroscience at the University of Edinburgh, who was not involved in the study, told MNT. Dr. Joseph Johnson, professor of psychology at Miami University, Ohio, who was not involved in the study, told MNT that if these findings are reproduced in future studies, researchers and clinicians may be able to use the pupillary response to more objectively measure visual imagery than current self-reports.

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