If a computer program was making random guesses about a pair's social distance, it would guess right 25% of the time. But a program based on the brain responses correctly identified friends 48% of the time. It also recognized distance 2 relationships 39% of the time, distance 3 relationships 31% of the time, and distance 4 relationships 47% of the time, according to the study. (What's more, when the program was wrong, it was usually only off by one category.)

Source: Los Angeles Times January 30, 2018 23:46 UTC