Well you need some input to the brain, even if it’s in a vat. Something has to either stimulate the retina or stimulate the relevant neurons further down the line. At least during some learning phase.
Or I guess you could assemble a brain-in-a-vat with memories built-in (e.g. the memory of seeing red). Thus the brain will have the architecture (and therefore the ability) to imagine red.
Well you need some input to the brain, even if it’s in a vat. Something has to either stimulate the retina or stimulate the relevant neurons further down the line. At least during some learning phase.
Or I guess you could assemble a brain-in-a-vat with memories built-in (e.g. the memory of seeing red). Thus the brain will have the architecture (and therefore the ability) to imagine red.