Humans are good at recognizing full facial expressions which present a rich source of affective information. However, psychological studies have shown that affect also manifests itself as micro-expressions. These are very rapid 1/3 to 1/25 second involuntary facial expressions which give a brief glimpse to feelings that people undergo but try not to express. Researchers at Oxford University and Oulu University are developing software that can recognize these ‘micro-expressions’. The initial experiments do indicate that the approach can distinguish deceptive from truthful micro-expressions, but further experiments need to be conducted to confirm it. The full paper is available here.