Research Study: "Eye Movements...Predict Personality Traits"

Yes, I would expect a skepticism of that sort and I actually think it's warranted.
The blanket comparison of eye-movements against BigFive traits is very.... very crude.

The reason Big Five is used as the go-to personality metric to test against is because it's the only one that's proven to have any sort of statistical fidelity (of a sort) but it is not a model of human nature. Think of the Big Five as a real phenomenon at the broadest and most general level of resolution. Like if you were to ask the question of what colors the world is made of. Yellow, Red, Blue, White, Black <-- is a good answer. But it says nothing about "how" or "what" produces each color, and for that you need to get into material properties and chemistry.

The wrong personality metric is being used to compare eye movements to, so this approach is really not going to produce the proper results. Also, I need to note that vultology is a field... that is presently nearly non-existent. And studies like this are just dipping their toes into a phenomenon (42 participants, hah!) without any real reverence for it's ginormous magnitude or scope.

If you really wanted to discover the link between human-expressivity and personality you have to dig far deeper than just eye movements and also be agonostic as to where (along that expressivity) the answer may be found. For example, if I had unlimited funding the way I'd do vultology is by tracking literally everything about a person's movements for hours at a time, across hundreds of samples. Things like their gait, their speech tone, their facial expressions, their posture, how much eye contact they retain, how quickly their saccades go, how many saccades and in what context they do them, how long they take to say each word, how many words they say, which words they accentuate, what their head and arms do as they talk, etc -- and then run the data through a massive number-chruncher to see statistical correlations. They would definitely appear.

That would be the proper way to truly index human expressivity. Taking a menial slice of the pie (eye-directions) and comparing it to a very menial/general personality survey (we are so behind in psychology, that Big Five is the only thing we feel confident about) will hardly result in anything robust enough to use.

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