Experts from America proved to 15 months of age children can easily identify the emotions of adults. You do not even have the ability of speech recognition, because emotions are mostly intonation and facial expressions of the person.
These results came from the research group after the experiment. The kids played a game with toys that emits different sounds. The kids had plunged headlong into entertainment.
During the experiment in the nursery is another man and began to talk to the observer in a serious and harsh tones. Most children drew attention to it and continued to play until the "evil man" will not leave the room. This fact shows a rapid psychological development of today's children. Already 15 months, the kids formed the beginnings of self-control and awareness of their own behavior.