“…They assert that the evidence only establishes the existence of particular brain states during hypnosis, not that the states played a causal role (Kirsch, 2000;Kirsch & Lynn, 2006;Wagstaff, 2000). These critics admit to dissociative-like cognitive processes, acknowledge neurobiological evidence of brain states that correspond to altered cognitive functioning, offer few proposals themselves for critical brain-state evidence to support their position, and propose ever more stringent demands for controls conditions (that some argue are impossible) (Gruzelier, 1998(Gruzelier, , 2000Hasegawa & Jamieson, 2002;Kirsch, 2000;Kirsch & Lynn, 2006;Wagstaff, 1998Wagstaff, , 2000. This may simply be part of the refinements in theory and method that occurs as science advances.…”