All materials are made up of atoms – particles that further characterize the properties of the material. Each atom contains both positive and negative particles - in a neutral state, their sum is equal to zero. When one of the particles is lost, the atom becomes an ion – it has a positive or negative charge. Ions with opposite charges attract each other, those with the same charge repel each other. Electromagnetism, then.
Materials can be divided into two basic groups – conductors and insulators. Electrons (your mind) can move freely in the conductor - the conductor can be statically charged in an isolated environment (your body) and easily discharged when in contact with the ground.
An insulator can retain its static charge for a very long time and can even have a charge of different polarity in different places. In insulators, electrons cannot move freely and therefore insulators cannot be easily de-charged by grounding, you have to "direct" them correctly.