What are the effects of electric shock to the back of the head?

Electric shock: The effects of an electrical shock depends upon the amount of current and how long of a contact was made. Mostly, small shocks cause some local tissue swelling and pain. Unlikely to affect your brain as the way electricity runs is through the low resistance parts of the body. Might get some neck pain, some neuralgias of the scalp. Again, effects depend upon the amount of current really.