This quote comes directly from a well-known 2014 study published in PLOS ONE titled "Perceived Intelligence Is Associated with Measured Intelligence in Men."
The research explored whether people can accurately judge someone's intelligence just by looking at their face, and what specific facial structures drive those impressions—particularly regarding men.
What the Study Found
The "Smart" Facial Gestalt: The study used composite photography and geometric morphometrics to isolate the specific features that make an observer look at a face and automatically think "intelligent." As noted, these include:
A longer, more oval or prolonged face shape (as opposed to a broad, round face).
Wider-set eyes.
A larger, more prominent nose.
A slight upward curve at the corners of the mouth (giving a subtle impression of competence or a faint smile).
A sharper, more pointed chin.
The Accuracy Paradox: Interestingly, the study found that while observers were able to accurately guess the measured intelligence of male faces, these judgments were tied specifically to the face shape, but only generalized for men in the study.
The Halo Effect of Expression: Part of why certain faces are perceived as more intelligent comes down to structural cues that overlap with expressions of happiness and confidence. The slight upturn of the mouth and a narrower lower face often signal social competence, approachability, and confidence, which human psychology frequently conflates with competence and general intelligence.
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