Why did the Qur’aan describe the front of the head as being lying and sinful? Why didn't theQur’aan say that the person was lying and sinful? Is there a relationship between the front of  the head and lying and sinfulness?

The arabic word Nasiyha means forelock.  If we look into the skull at the front of the head, we will find the prefontal area of the cerebrum. What does physiology tell us about the function of this area? A book entitled,  Essentials of Anatomy & Physiology, says about this area: The motivation and the foresight to plan and initiate movements occur in the anterior portion of the frontal lobes, the prefontal  area. This is a region of the association cortex...  The book also says: In relation to its involvement in motivation, prefrontal area  is also thought to be the functional center for aggression... 
So, this area of the cerebrum is responsible for planning, motivating, and initiating good and  sinful  behavior, and is responsible for telling lies and speaking the truth. Thus, it is proper to describe the front of the head as lying and sinful when someone lies or commits a sin, as the Qur’aan said: ...a lying, sinful aasiyyah (front of the head)! Scientists have only  discovered these functions of the prefrontal area in the last sixty years, according to  Professor Keith Moore.