Talking about and Measuring Emotions

Way back when we worked with MIT on measuring emotions when people interacted with our products, we discovered the difficulty of measuring this consistently.   Later when we looked at 'neuromarketing' methods, things were not much better.   A number of machine learning methods now claim to make this easy.  Consideration of some derived sentiment based on emotion.  A neuroscientist looks at the issue of naming emotions:

A neuroscientist explains why we need better ways to talk about emotions
We still don’t know what an emotion is
By Angela Chen   @chengela in the Verge  ... " 

See also, Sentiment Analysis.