This article (text is just an topic introduction so it doesn't matter that it's French IMO) shows a body heat map for each main emotion (in English) that was created by Lauri Nummenmaa (Aalto University, Finland) and published in the "Proceedings of The National Academy of Sciences". The panel was 700 people and emotions were induced by images and stories FYI (I could translate the article if some people are interested but there is not much in it).
The map rises a number of questions to me :
1- What are effect on the health ?
Happy people are shown "hotter" (and yes a happy person looks more attractive (hot) too, coincidence ? ^^), which mechanically means that they either use more energy, or they use it differently, therefore prioritising certain functions over others. Does this affect long time health ? I mean to produce more heat, you need to burn more calories (so it should be possible to lose weight easily), so you need to have a faster heartbeat to get the blood flowing I guess, therefore making it work harder, which I think can shorten the lifespan. On the other hand if you just switch energy from one system to another this can create problems too (like slow digestion, trouble to focus...). We could do this for other emotions like sadness which has the opposite effect but could create circulation problems.
2- What are potential applications commercially ?
How can we use those results to create interesting products ? I'm pretty sure japanese already have emotion detection gadgets, but we could create better ones with that. Could we induce the emotion by heating the body properly ?
3- What are potential applications on communication ?
In lie to me they use the hands to see if someone shows fear, but this could also be sadness which would mean quite a different thing. Red faces are usually tied to anger, happiness or shame but it could also mean disgust, contempt or surprise according to the map (since I believe heat is transported by fresh blood).
Maybe we could figure out some techniques to use this in communication.
What are your thoughts ? how do you think we can use this ?
PS : I had trouble categorising this, so I put it in labs if people want to do some experiment with it. It would have been great to have a scientific facts category, as some facts may not fit in labs, communication or body language categories but that uncategorised is IMO to avoid.