This article (15 page PDF) describes "a tool that applies facial expression recognition to support learners' reflections in video-based learning." This may feel a bit dystopian, but it is worth mentioning that one of the perceived benefits of in-person learning is the teacher's ability to 'read faces' to determine whether the class is responding well. Such a tool would augment this capacity, something especially useful for people like me who aren't fluent in reading faces. As well, the tool, called Mirror, would help learners develop "a deeper understanding of their (own) learning experiences through self-observation and attributing causes for their learning affects through self-judgment." Anyhow, this paper goes into a lot of detail about the design and testing of Mirror, including an extended discussion of the ethical issues involved (such as, interestingly, the use of such a tool for augmenting emotion regulation).
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