This study (18 page PDF) offers " information about the current state of emotion recognition technology and how its practical use is being carried out in educational settings." It does point out that "most of the research has been conducted from a theoretical perspective and none of them has been fully developed and implemented in the classroom." This is no surprise - the classroom is the last place I would expect to see educational technology deployed. Anyhow, it considers methods like facial recognition, speech analysis, and combinations of these and other cues. About 14% of the systems were at technology readiness level (TRL) 5,6 or 7 - "validation and demonstration in a relevant or operational environment" - and none were above that.
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