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RE: Human Vision has Evolved to Detect Snakes
It's more than just a theory, it has been proved several times.
At one of the papers I read when I wrote an article about the same topic here, it was stated that the distraction levels "focusing" on a snake cartoon were considerable (If I don't recall wrong over 50% of the time the eyes glanced towards the snake figure, instinctively checking "where is it at" even when it poses no threat).
I agree completely. It's definitely been proven more than once (I think this is just one of the more conclusive tests to date), but even still they tend to refer to it as a "theory". I'm not exactly sure why.
Perhaps because this modern society allows regressive genes to prevail. So, from time to time, a human with no snake detection traits gets bitten throwing the facts overboard :p
Definitely a plausible conclusion! So perhaps it's still just a theory because while it has been proven in most test participants, there are still a few outliers that call the results into question.
Well, a similar case would be the disappearance of the wisdom teeth. Some people are already not having them. As I explain in my article: having them does not kill you. So, humans rely on random mutations until they vanish from our race.
In the same way, not having the snake detection trait does not kill, most, of us. So, we also rely on random mutations.