Amygdalae, groups of neurons in the brain, play a key role in how people recognize emotions in others' facial expressions by responding to what we think we see, according to research presented at the Society for Neuroscience annual meeting. Researchers implanted electrodes into test subjects' amygdalae and recorded how the neurons responded when the patients saw photos of happy or fearful faces, finding that the amygdala neurons reacted to what the subject thought they were seeing rather than actual visual characteristics.

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