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People suffering from depression sometimes see the world as being monochrome or flat with a hint of gray and blue. At first, experts believed that this was mainly psychological. However, there have been numerous studies that suggest that this may be biological as well. 

According to a 2010 study that was published in the Harvard Medical Publishing titled “Seeing Gray When Feeling Blue? Depression Can Be Measured in the Eye of the Diseased”, it was suggested that the gray world that depressed people see could be caused by impaired contrast perception. 

Over ten years after this study was conducted, another study by the University of Helsinki’s psychology and psychiatry researchers studied how visual perception could be affected by depression. What they found confirmed previous studies that showed how depression could alter visual information processing. They found that this was mostly because of the cerebral cortex’s processing differences. 

Depressed People Have a Different Perception of the Contrast of Images 

Medical Xpress stated that the researchers used two perception tests to compare how depressed individuals processed visual information. In these tests, they had to compare both the contrast and brightness of single patterns. 

Vitamin Salmela, a Fellow at the Academy of Finland Research, said that the findings suggested that depressed individuals perceived visual information differently compared to people who aren’t depressed.