A patient called TN, who was cortically blind, exhibited what is called affective blindsight. He was able to react spontaneously to facial expressions, with an appropriate emotional response accompanied by activity in the right amygdala, even though he denied that he had seen anything – and indeed, in the conventional understanding of the word ‘see’, he had not.97 He was also able to walk down a corridor negotiating a range of awkward obstacles that had been placed in his path, some low to the ground, some higher – a bin, a tray, a tripod – and avoided every one of them. He had to squeeze up
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