Artworks associated with “Plate 14: Designed to show a comparison between the maximal contraction of the superior part of m. orbicularis oculi and m. corrugator supercilii, in the same individual. On the left, very strong electrization of the superior part of m. orbicularis oculi: dissatisfaction, somber thoughts. On the right, electrization of m. corrugator supercilii.”