Figure 1.

(a) Example human face and illusory face stimuli used in Experiments 1 and 2. Stimuli of each face type (human, illusory) were categorized into four groups as ‘low’ or ‘high’ along the expression dimension of happy versus angry. (b) Example trial sequence for the serial dependence paradigm used in Experiments 1 and 2. On each trial, subjects rated the perceived expression of the presented face on a scale of ‘very angry’ to ‘very happy’ (with ‘neutral’ anchored at the centre) using a slider response bar. (Online version in colour.)