Starfield NPCs have "fake smiles" and it's actually really creepy

gamesradar.com:

A Starfield fan has figured out what's off about the game's NPCs, and it comes down to their "fake smiles."

Twitter user Delaney King, who also happens to be a character artist on Dragon Age, has pointed out what it is that makes Starfield's NPCs seem a little… off. In a thread, King explains that the Bethesda characters have an issue with their smile, more specifically, with "the orbicularis oculi muscle not contracting," which gives humans (and characters) a 'Duchenne smile.' 

As King explains, characters such as Sarah Morgan and The Adoring Fan only use the bottom half of their face to smile, meaning their eyes don't really change when their mouths do. "When you smile and this muscle doesn't contract," King adds, "you get a 'fake smile' or a 'liar's smile'." In the thread, the developer shares several examples, including a photo of András Arató, aka the Hide the Pain Harold meme, and The Boys actor Antony Starr. 

When you smile and this muscle doesn't contract, you get a "fake smile" or a "liars smile". pic.twitter.com/SPiZdstEc9September 10, 2023

This smile probably bugs you for some reason you can't put your finger on as will. Allow me.This is the zygomaticus major muscle. It contracts when you smile, pulling the corners of the mouth up towards the Zygomatic process. But here it isn't pic.twitter.com/nu12XqTnZ8September 10, 2023

"This muscle here has to contract for a smile to read as a genuine smile. The cheek apples should also rise, otherwise, you look like you are actively resisting the smile, giving a constipated look," King says, using a photo of Sarah Morgan. The Twitter user then moves on to Adoring Fan adding: "This smile probably bugs you for some reason you can't put your finger on as well [...] This is