Figure 1.

A schematic illustration of the experimental procedure (ITI—intertrial interval; ISI—interstimulus interval). The experiment consisted of an adaptation phase and a post-adaptation test. During the adaptation phase, which consisted of repeated presentations of an adaptation stimulus, observers were adapted to a specific gaze-direction (as indicated by head-orientation). This adaptation block was then followed by a post-adaptation test, in which observers' gaze-perception was measured. Each post-adaptation test trial consisted of a test stimulus gazing to the left, straight ahead, or to the right, preceded by a top–up adaptation stimulus.