[logram]

>You provide a certain input and you get a certain output. When you provide the same input again and again, you get the same output. This is very different in the brain. In the brain, even if you choose the exact same stimulus, the response varies from trial to trial.

>Where does this variable response in the brain come from?

>There are various hypotheses. There is, for example, unreliable synaptic transmission.

Maybe I am looking too much into a very simple example, but I disagree with it. The brain has recurrence and memory. The first time you show me something I react differently than the second time you show me it. Time has passed, my brain has acquired tons of feedback information, I have an idea of what it is before you show me again. If you have even the most simple models that incorporate memory (such as higher order Markov chains), they will react differently too.