Table 1 List of features

1) Iris area while lifting eyebrows with both eyes

directed upward.

EBlift_Iris

2) Rate of movement from at rest to lifting of eyebrows

(using distance between SO and upper part of the occluded iris).

EBmd_SO_uIris

3) Rate of movement from at rest to lifting of

eyebrows (using distance between SO and IO).

EBmd_SO_IO

4) Distance between SO and IO while lifting eyebrows.

EBlift_SO_IO

5) Distance between SO and upper boundary of the

occluded iris while raising eyebrows with both eyes looking upward.

EBlift_SO_uIris

6) Distance between SO and IO while closing both eyes.

Eclose_SO_IO

7) Iris area while showing teeth or smiling.

smile_Iris

8) Distance between IO and mouth angle

while smiling.

smile_IO_MA

9) Iris area while screwing nose.

snarl_Iris

10) Mean ratio of features 1–9.

meanRatio