'Aphantasia', Absence of Visual Imagination, Shown Detectable Through Pupil Dilation

Long-time Slashdot reader drinkypoo writes: Researchers at UNSW Sydney have discovered that aphantasia, or lack of visual imagination, can be detected by lack of pupillary response. Pupillary response to both real and imagined objects was measured and compared, and the response to imagined objects was larger in those reporting greater vividness of imagery. "One of the problems with many existing methods to measure imagery is that they are subjective, that is to say they rely on people being able to accurately assess their own imagery," says Professor Joel Pearson, senior author of the paper."Our results show an exciting new objective method to measure visual imagery, and the first physiological evidence of aphantasia. With over 1.3 million Australians thought to have aphantasia, and 400 million more internationally, we are now close to an objective physiological test, like a blood test, to see if someone truly has it... We are very close to having objective, reliable tests for extreme imagery, aphantasia and hyperphantasia (extremely strong visual imagery) that could be scaled up to run online for millions of people everywhere," Another author on the study sees a larger significance. aoeThese findings further highlight the wide variability of the human mind that can often remain hidden until we ask someone about their internal experiences or invent new ways to measure the mind. It reminds us that just because I remember or visualise something one way, doesna(TM)t mean everyone does.a

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