 To be sure, this assessment is not universally accepted. As we saw, Bayne and Chalmers (2003) and Bayne (2010: ch. 9) urge that while access unity is split in these patients, phenomenal unity need not be. Why not? Because there may be no duality of unified consciousness at any given time. Rather, a single instance of unified consciousness may be switching back and forth between the material in the two hemispheres. As Schechter (2012) has urged, evidence of a simultaneous duality of consciousness would be a major problem for this approach. We will not attempt to assess the relevant evidence here (see Brook 2015 for further discussion). Even if Bayne is right, that should not affect the prospects of a unified account of disorders of unified consciousness—what is going on in brain bisection cases would not be a disorder of unified consciousness! 