hello, this device sounds potentially useful for feeding back to its wearers? Picard's lab and others tend to focus on external control options - not right! Learning how to recognise one's own mounting stress (or whatever) is a very useful skill and learning that the class teacher can read this when you cannot is a terrible and harmful lesson. So I'd be very pleased to find you are taking a different approach. BTW fya, @CT I'm an old friend of the Dombeys.