TLDR
The act of frowning—Reflection with an effort, or with the perception of something difficult or disagreeable—Abstracted meditation—Ill-temper—Moroseness—Obstinacy Sulkiness and pouting—Decision or determination—The firm closure of the mouth.
The corrugators, by their contraction, lower the eyebrows and bring them together, producing vertical furrows on the forehead—that is, a frown. Sir C. Bell, who erroneously thought that the corrugator was peculiar to man, ranks it as “the most remarkable muscle of the human face. It knits the eyebrows with an energetic effort, which unaccountably, but irresistibly, conveys the idea of mind.” Or, as he elsewhere says, “when the eyebrows are knit, energy of mind is apparent, and there is the mingling of thought and emotion with the savage and brutal rage of the mere animal.” There is much truth in these remarks, but hardly the whole truth. Dr. Duchenne has called the corrugator the muscle of reflection; but this name, without some limitation, cannot be considered as quite correct.via the TL;DR App
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Written by charlesdarwin | On the Origin of Species By Means of Natural Selection