Depression Literally Grays Visual World

Depression actually alters vision, making the world appear far more dull and monochrome because people with depression show lower retinal activity compared with those who do not have the condition. In a 2010 report from Harvard, researchers placed electrodes near volunteers' eyes as they viewed black-and-white checkerboard patterns and found that depressed patients had weaker retinal responses to contrast, which may explain why their visual world seems gray instead of vivid.

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