An alternative explanation, however, is that subjects who do not control camera movement—and who are not otherwise attuned to how the camera is moving—are simply unable to extract any information about the structure of the distal scene from the incoming pattern of sensory stimulations. In consequence they do not engage in “distal attribution” (Epstein et al. 1986; Loomis 1992; Siegel &amp; Warren 2010): they do not perceive through the changing pattern of proximal stimulation to a spatially external scene in the environment. For development of this alternative explanation in the context of Bayesian perceptual psychology, see Briscoe forthcoming.