Most of what we read off a face comes from expression, the momentary stuff. But there's a separate, more contested question underneath: does the fixed structure of a face, the actual shape of it, carry any information about the person too?
This is where the research gets more argumentative, and more interesting.
The width-to-height story
The most talked-about example is the facial width-to-height ratio, essentially how wide a face is relative to its height. In a 2008 study in Proceedings of the Royal Society B, Justin Carré and Cheryl McCormick reported that men with wider faces behaved more aggressively, both in a lab task and, memorably, in the penalty records of hockey players. The proposed explanation was hormonal: testosterone shapes both facial growth and certain behaviours, so the face ends up as a rough, indirect trace of it.
It's a striking idea, and it caught on quickly. Wider face, more dominance and aggression, all traceable back to biology.
Why to hold it loosely
Here's the honest part. Since that early work, the width-to-height story has had a bumpy ride. Some later studies replicated pieces of it; others found the link weaker than advertised, or tangled up with other factors. It's become one of those findings that's probably capturing something real, but not the clean, reliable rule it first appeared to be.
That's worth sitting with, because it's a good model for this whole field. There often is a signal in facial structure. It's just usually fainter, noisier, and more hedged than a confident headline would have you believe.
The reasonable middle
So does the shape of a face say anything? The fair answer is: a little, sometimes, on average, and never as much as you'd want for judging any single person. Structure whispers where expression speaks.
That's the spirit Personality Scan is built in, treating a face as something worth reading closely while never pretending the reading is the final word.