This. The concept of consciousness assumes that (ethically) all humans are conscious. If that were not true, then we have to ask, what is the threshold - as we

This. The concept of consciousness assumes that (ethically) all humans are conscious. If that were not true, then we have to ask, what is the threshold - as we would of machines. If people cannot all pass the test, as you say, not all humans are conscious. Are those that fail sub-human? If tests are not viable for humans, why are we conscious? At what point is one conscious? Is it a property of your age; if so at what age? Is it variable; am I more conscious than you? How is that measured? Then is it an emergent property of intelligence? But wait, what is intelligence? Is that measurable?... Round and round we go, consciously wasting brain cycles. I find the whole topic the modern-day equivalent of counting angels on pins. It is sophistry, but so deeply ingrained in our culture that we all seem to accept it as real. It is a hang-over of the concept of the soul - an indefinable quality that set humans apart. The trouble is there is no evidence for it; it has to be taken on faith.