The effect of motion-face adaptation on the perceived expression of the static cartoon faces. (a–d) Psychometric functions from two naive subjects (DC, JK) and two experimenters (HX, JW). The test stimuli were always the static cartoon faces (cf). The adapting stimuli varied with conditions as follows: 0-cf, no adaptation baseline (blue); cf-cf, adaptation to the saddest cartoon face (green); mf-cf, adaptation to the saddest motion face (dashed black). (e) Summary of all four subjects’ data.