In just a handful of years, the business of emotion detection - using artificial intelligence to identify how people are feeling - has moved beyond the stuff of science fiction to a $20 billion ...

As such, gait detection and identification of walking trajectories combined with facial expressions in a given pedestrian setting can predict their future walking behavior and emotional state.

AI agents are being trained to detect and respond to human emotions using natural language processing (NLP), voice analysis and even facial recognition.