'The final circumstance addressed here... points to a set of physiological psychological concerns that have only recently begun to be considered by historians of the topic: that of the role of media technologies in investigation (Chadarevian 1993; Brain and Wise 1994; Otis 2001; Schmidgen [2009] 2014; Brain 2015). The increasing prevalence of cinematographic and otherwise illusion-generating devices in physiology laboratories presented physiologists committed to physical modes of explanation with a set of particularly intractable problems relating to the relation between mind and life.'