Knowledge Base

Expression States Explained

An expression is dominant when its intensity is higher than that of all others. Each time the dominant facial expression changes and is active for at least 0.5 seconds, this expression is scored as a state. This state appears in the Timeline and is also scored with its time stamp in the State log.

Note that if the intensity, as displayed in the Head Orientation Line Chart, exceeds 0.5, this does not necessarily mean that an expression state is scored. In the following example the Expression Intensity is compared with the Expression states. Sad and Disgusted exceed 0.5, but only Disgusted is scored at that time, because its intensity is higher than that of Sad and was dominant for at least 0.5 seconds. (see the blue bar on the timeline).

Unknown means that no face is found or the face cannot be modeled (for instance, because the quality of the video is poor or a hand partly hides the face). For video analysis, Not Analyzed indicates what part of the video has not yet been analyzed.

Options

Expressions

Click Expressions and choose which expressions you want to view. By default all expressions are selected.

Events

The timeline also shows the Stimuli and Event Markers in your project. Optionally deselect either the Stimuli, Event Markers, or both using the Events button.

Expressions

Deselect Expressions if you do not want to see them on the Timeline.

Facial States

With Facial States, choose whether you want to display the Facial States (Left Eye, Right Eye, Left Eyebrow, Right eyebrow, Mouth). By default, all these options are selected.

Gaze Tracking

If you selected Gaze tracking in the Settings you can visualize the Gaze Direction and Gaze Type on the Timeline.

Action Units

If you have the The Action Unit Module, the timeline also shows the intensity of the Action Units. Optionally, deselect some Action Units, using the Action Units button.

Consumption Behavior

If you have The Consumption Behavior Module, the timeline also shows the behaviors 'Intake event', 'Chewing' and 'Chew motion'. Optionally, deselect some from the Consumption Behavior drop-down list.

Voice Expressions

If you have the Voice Analysis Module the Timeline also displays the dominant emotions recognized in the participant's voice.

Notes

• For more information about the State log, see Export Analysis Results.
• If you want to use other criteria to define a state, for example when the intensity of an expression is above 0.5, export the detailed log. Then calculate the states in another program, like Excel. See Export Analysis Results

Source: FaceReader 10 Reference Manual (Help), Noldus Information Technology