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| Description: (a) A woman with volitional facial paresis caused by a right hemisphere lesion tries to pull her lips apart and show her teeth. Only the right side of her face responds. (b) The same woman shows a genuine smile. (c) A man with emotional facial paresis caused by a left-hemisphere lesion shows his teeth. (d) The same man smiles. Only the left side of his face responds. (From Hopf, H. C., Mueller-Forell, W., and Hopf, N. J., Neurology, 1992, 42, 1918–1923.)
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