For the first time, scientists can identify your emotions based on brain activity

Led by researchers in CMU's Dietrich College of Humanities and Social Sciences, the study had a group of actors look at words like anger, disgust, envy, fear, happiness, lust, pride, sadness and shame. As they did so, the actors tried to bring themselves to this emotional state. Their brains were monitored by fMRI and a computer modeled the results.

 Based on these scans, the computer model could then correctly guess the emotion of the actors when they were shown a series of evocative photos. Each emotion essentially had a neural signature. The patterns of brain activity the computer learned were not limited to those individuals. Based on the scans of the actor’s brains, the computer model could correctly identify the emotions of a new test subject who had not participated in the earlier trials.

 http://www.theverge.com/2013/6/19/4445684/brain--scan-fmri-identify-emotion