Some of the early projects involved autistic children who had a difficult time expressing how they were feeling with cues that were obvious to their caretakers and teachers.
I can’t wait until the technology evolves to where we can embed the sensors in a dog’s collar. No more guessing whether a dog is mad or scared. No more missing the cues that a dog is going over threshold into emotional deep water. Way more fewer dog bites because the emotional signs were missed. Maybe we can even detect the subtle difference between rewarding with roast beef or chicken, and train accordingly.
Google: Mood Wings Czerwinski to find more articles and pictures of current technology.