The facial features of northern and southern Koreans are also very different, which indicates they have different brain types.
In northern Koreans, the right side of the forehead is more projected, which suggests a high possibility of having a larger right brain. In southern Koreans, on the other hand, the left side of the forehead is more projected, suggesting a high possibility of having a larger left brain.
In academic circles, these two types are referred to as the "Potato Type,” to describe those from the north, and the "Peanut Type," to describe those from the south. The faces of northern Koreans are oval in shape, with a more outwardly projecting top of the head. The faces of southern Koreans, on the other hand, have a more squared shape, and in more pronounced cases the shape is similar to that of a peanut