Illustration of the partial expressions used in the study (with the example of the KDEF model F12).

For each expression (top left), the top, middle and bottom parts were isolated (top right) and superimposed on the neutral expression of the same person to obtain a full expression (bottom left). Partial expressions were created either by removing one part from the full expression (bottom right, first row) or by superimposing only one part on the neutral face (bottom right, second row). (ZIP)