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I was just thinking that circadian rhythm could be a form of output with no input. When surrounded by pitch dark and no cues for day and night, we still follow similar patterns as we would with the changing patterns of the sky.

Also, I was hoping we could start thinking about another problem with our even newest model. Namely, I do not think that it accounts for top-down processing and the way our previous knowledge shapes and even tunes out or tunes in different inputs. Can this be accounted for in a box or do we need an arrow going backwards somewhere in the model?