Figure 2 : Depicted are five Mona Lisa’s variants25 (left column, S1, S5, S9, S11 and S13, created in Dr. Kornmeier’s lab) and the enlarged corresponding mouth regions (right column).

From: Mona Lisa is always happy – and only sometimes sad

Figure 2

The red and blue filled circles in S9 indicate the left and right mouth corners of the central stimulus in the Full-Range Condition (S9) and in the Half-Range Condition (S5). Arrows indicate the corresponding trajectories of the mouth corner locations of the different stimulus variants for the happy (upwards, solid lines) and sad (downwards, dashed lines) face expression.