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Patient TN was, by his own account, completely blind. Two consecutive strokes had destroyed the visual cortex of his brain, and consequently, his ability to see.
His first stroke had injured only one hemisphere of his visual cortex. About five weeks later, a second stroke damaged the other hemisphere. An assessment of his brain function revealed that after two strokes, TN, in his 50s, was clinically blind.
Known as selective bilateral occipital damage, TN's unusual injury made him the subject of much interest while recovering at a hospital in Geneva. Researchers began examining him and discovered that despite his blindness, he had maintained the ability to detect emotion on a person's face. He responded appropriately — with emotions such as joy, fear, and anger — to a variety of facial expressions. Observed activity in his amygdala — the part of the brain responsible for processing emotions — confirmed the curious results....(continued at link + video)