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Are you sure that is all the brain does?

As far as "inputs and outputs" are concerned, yes. (Well, not quite, I think there is also communication with the body going on through chemical signals - but even this doesn't have to do a lot with how we experience our senses)

Not a neurologist, but that's about what you can read in basic biology textbooks.

What is the value of ignoring the endocrine system?

There are plenty of inputs to the brain outside of neural signals and implying otherwise isn't even at the level of basic biology textbooks.

I'll put it this way - what are the 'sensor nerve signals' that make us tired pray tell? Do models 'get tired'?

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