I have gathered the heads of the 82 plates, in the form of little medallions, that make up the Scientific Section and the Aesthetic Section of the Album of The Mechanism of Human Facial Expression in nine synoptic tables. Some of the figures are repeated, where, for example, I have produced a different expression on each side of the face. The result is that this synoptic table is made up of 102 heads.

1. 1. I have indicated in the captions to these plates that we can alternatively cover the diverse features of these photographs, which have a double expression, in order to make a comparative study. The synoptic tables show these experiments already done, and make the analysis of the expressive lines of the human face even easier and clearer. They suffice, at a pinch, for understanding the developments detailed in the text of this work.

2. 2. The modifying influence of certain expressive lines on the other features of the face is assuredly, from the point of view of the practice of painting and sculpture, one of the most important facts to come from the electrophysiological experiments performed in my work on the mechanism of human facial expression. The synoptic tables facilitate the study of this phenomenon that I call simultaneous contrasting of the expressive lines of the face.

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