3. Facial expressions, for example baring one’s teeth and frowning. 4. Cognitive evaluations of events, stimuli or objects. Can you classify emotions? Facial expressions are only one out of many correlates of emotion, but they might be the most apparent ones.
Facial expression analysis techniques. Facial expressions can be collected and analyzed in three different ways: 1. By tracking of facial electromyographic activity (fEMG) 2. By live observation and manual coding of facial activity 3. By automatic facial expression analysis using computer-vision algorithms. Let‘s explain them in more detail.
2 Sadness. Sad expressions usually display upwardly slanted eyebrows and a frown. Sadness is coupled with feelings of loss and helplessness. The face is often displayed by those who are withdrawn. The origin or reason for this expression is rather simple: The features that indicate sadness are reduced forms of one’s facial features.