Show me your emotions 

Since the publication of Charles Darwin's "The Expression of the Emotions in Man and Animals" in 1872, generations of scientists have used facial expressions as a proxy for a person's emotional status. At this time, researchers had only their individual observational skills available to them for the study and interpretation of mimic activity. The methodological spectrum for the quantitative and qualitative assessment of such effects has broadened enormously in the last 150 years. Today, in addition to EMG for measuring facial muscle activity, video-based methods are also available that are able to classify facial expressions and assign them to specific emotions with the help of machine learning. The CNSR has also recently been provided with such a system by the company Noldus, which makes it possible to differentiate between happiness, sadness, anger, surprise, fear and disgust in videos and photos with a high classification quality (Dupré et al., 2020).

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