In a neurosurgical patient with intractable epilepsy who was temporarily implanted with electrodes, electrical stimulation of face-selective and color-associated brain regions while the patient viewed various objects led the patient to report seeing illusory faces and rainbows, respectively, suggesting that the corresponding brain regions may be specific to face and color processing, according to a study.
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Article #17-13447: "Facephenes and rainbows: Causal evidence for functional and anatomical specificity of face and color processing in the human brain," by Gerwin Schalk et al.
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Proceedings of the National Academy of Sciences