There is a condition where a person has a complete lack of visual imagination, or is unable to mentally visualize images. It is a case of aphantasia, which, according to recent articles, can be detected by measuring pupil dilation. So, check out now how the pupil can help indicate a lack of visual imagination.
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The discovery is described as "the first physical evidence of fantasy" in the study, and the authors believe they are closer to developing an objective physical test, such as a blood test, to accurately diagnose condition.
Currently, aphantasia is usually diagnosed after a series of questions designed to stimulate imagery. visual, which is subjective and dependent on the patient's ability to accurately assess the images, making it difficult to diagnosis.
In the study, researchers measured pupil dilation in 60 people while looking at light or hazy shapes on a neutral background. The authors noted that when contorted shapes were presented, the pupils became larger, and when clear shapes were presented, the pupils became smaller.
Participants were instructed to imagine and describe the shapes they were about to see in the second phase of the experiment. According to the authors, those who shared more vivid memories received a stronger pupil response.
When we are working on a more difficult task, the pupils get bigger. In this sense, it is possible to say that, for example, imagining three objects at the same time is more difficult than imagining only one. When people with aphantasia imagine four different shapes compared to one, the opposite pattern occurs, and there is no change in dark or light pupil colors.
In addition to a lack of visual imagination, the human eye can also indicate the risk of premature death. In this case, instead of the pupil, a previous study analyzed the retina of some people, because it is particularly sensitive to the effects of aging, and as this tissue houses blood vessels and nerves, it provides significant information about the vascular and cerebral system of the health of A person.
