Figure 1.

Illustration of some of the FAEs: distortion, identity, gender, facial expression and gaze-direction. Upper row: the adaptor stimuli; middle row: the ambiguous/neutral target stimulus; lower row: illustration of the percept after being adapted. For example, prolonged exposure to the second face of the upper row (Grace Kelly) would lead to the perception of the 50% morph stimulus (middle row) as biased towards another person (Halle Berry). For a demonstration of the effect, please visit http://cogsci.bme.hu/~gkovacs/FAE.html.