⁵A fundamental question is whether the brain chooses one interpretation or whether it can entertain several interpretations simultaneously. Something in between these two seems to be happening in the special case of bistable perception, which means that when a stimulus can very well be interpreted in two different ways, the two interpretations seems to be alternating in the brain, so that conscious perception switches from one interpretation to another every few seconds or so (Sterzer et al., 2009). The proportion of time allocated to each interpretation may, in fact, reflect its probability that the brain computes by Bayesian inference discussed next in the text (Moreno-Bote et al., 2011).