Figure 6.

Influence of facial expressions on scanning patterns of monkeys in FST

A: Schematic of FST. B: Examples of facial stimuli and definitions of eye, nose, and mouth regions (marked in red) for a human face, monkey face, and monkey face with scrambled eyes. Blue traces indicate a monkey’s viewing traces on the face. C, D: Normalized looking percentage for each face region and expression for Negative/Positive/Neutral human faces (C) and monkey faces (D). Blue, green, and magenta represent Negative, Positive, and Neutral expressions, respectively. E, F: Normalized looking percentage for each face region and expression for human faces (E) and monkey faces (F). Blue, light blue, and purple represent Negative expressions, Negative expressions with eyes scrambled, and Negative expressions with mouth scrambled, respectively. ^*: P<0.05; ^**: P<0.01, two-way ANOVA with Turkey post-hoc test.