Human brains are divided into two hemispheres, and though they are working together as one, each of hemispheres has it's preferences. There were experiments on disabling brain hemispheres by electroshock, and it appeared that human being act quite different in these situations. For example, while only left hemisphere was working, human is very rational but unemotional; with right hemisphere active, human is very emotional and cannot speak much - due to the fact, that most of the memory abstract tags like words, numbers etc. belong to left side of the brain. This was approved by patients with brain damage or those, that had brain operation dividing major connection between hemispheres. Last one from now on felt like "double-persons" because of brains halves were functioning more independent. They had interesting effect: as hemispheres control opposite sides of the body, with their right hand they could only write, and with left hand they could draw, as right hemisphere is about right-he