Human beings rarely use their whole brain for any kind of cognitive processing, why would this be any different. Sure it sounds good to say men only use half their brain, but honestly its just a part of how the brain works. A major point to be made here is that the brains of men and women have a major difference in how they function, female brains use parts from all over the brain in several processes, while male brains tend to use larger parts from a single region. This is why men are far more likely to have auditory and vocal damage from a stroke, i.e. alot of times men lose the ability to speak from strokes, whereas this phenomenon is far less common in women.
