What does the specified sentence mean? How can it be rewritten without "unless"? I can not understand the role and meaning of "unless" here.
But in reality he has still not resolved the Cartesian mind/ body dilemma for though Lucy is made manifest physically – from aluminium with hair and fabric – she is essentially virtual and her sensations are synthetic. So that she may ‘feel’, the chemical processes that are intrinsic to human emotions are mimicked, triggered by an interaction with the environment certainly, but processed through computerised differential equations – dry code, not wet chemistry. This may result in an exact simulacrum of human responses and behaviours but it might be difficult to determine whether Lucy can become a real and fully conscious being rather than a cleverly constructed zombie. Unless, of course, we are all zombie manifestations of virtual instructions? While Steve Grand is building Lucy one neuron at a time, some neuroscientists can see the potential to extend the capabilities of our existing brains.