How can humans tell that something is ‘off’ when presented with a CGI image that is very close to looking like the real thing? More specifically, why does this effect occur in things like CGI dragons or monsters or [that Sonic](https://pixel.nymag.com/imgs/daily/vulture/2019/05/01/01-sonic-the-hedgehog.w600.h315.2x.jpg), which are obviously not real to start off with?
And why does the ‘uncanny valley’ effect not occur in inanimate objects (for instance, I have never heard of anyone being creeped out by a CGI donut)?
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When we see something that is recognizablely not at first glance, like C-3PO, then when are pattern recognition abilities detect something which suggests that this does have some what human features, we tend to find it endearing.
But when we see something that looks human at first glance, and our pattern recognition abilities detect that there is something not human about it, it sends a warning signal to our brains and something is not right. It is very similar to the signals you get when you notice that someone is sick oh, but even more intense.
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