The first step was to fit ellipses to the head and the hands.

The second step was to calculate the center of the ellipses and make a plot of the Vertical and horizontal movement of that points versus time.

NOTE: all Actors where holding the utensil with the right hand

Click to see the Movement plots for Head and Hands

Click to Download Movement Data Files in Word

Conclusions

Neutral

Horizontal and vertical movement of the head and hand holding the utensil highly correlated

Inactivity time for horizontal and vertical movements of head and hands in the order of Seconds (greater than 500ms)

Moderate number of variations of the signals over time.

Sadness

Less horizontal and vertical movement (variations) in head and hand not holding the utensil

Hand holding the utensil kept in a fixed vertical and horizontal position over long periods of time (in the order of seconds)

Anger

Hand holding the utensil with higher variations over time and large magnitude. The lines of the plot are spiky.

Apparent calm followed by compulsive movements of hand holding the utensil

Moderate movement of head.

Hapiness/Joy

Considerable Horizontal and vertical movement of the head. Small magnitude continuous oscillations.

Horizontal movement of head and horizontal movement of hand holding the utensil correlated.

Stress

High and constant variations in the vertical and horizontal movements of the head and hand holding the utensil.

Boredom

long periods of overal inactivity.

Slow variations in vertical and horizontal movementof head and hand holding the utensil.