(i) The part that controls our movements
“No indeed! If he does not stop, We will grab him by the forelock, a lying, sinful forelock.” (96:15-16)
Why did the Quran describe the front of the head as being lying and sinful? Why didn’t the Quran say that the person was lying and sinful? Is there a relationship between the front of the head and lying & sinfulness?
The expression “the lying, sinful forelock” in the above verse is most interesting. Research carried out in recent years revealed that the prefrontal area, which is responsible for the management of particular functions of the brain, lies in the frontal part of the skull. What does physiology tell us about the functions of this area? A book entitled, “Essentials of Anatomy & Physiology”[1] says about this area:
The motivation and the foresight to plan and initiate movements occur in the anterior portion of the frontal lobes, the prefrontal area. This is a region of association cortex …………………
The book further says:
“In relation to its involvement in motivation, the prefrontal area is also thought to be the functional center for aggression….”
So, this area of the cerebrum is responsible for planning, motivation and initiating good and sinful behavior, and is responsible for telling lies and speaking the truth.
It is clear that the statement, “the lying, sinful lock” corresponds completely to the above explanations. Allah in the Quran stated this fact, which scientists have only discovered in the last 60 years, centuries ago.

[1] Essentials of Anatomy & Physiology by Seeley Rod R., Trent D. Stephens; and Philip Tate, 1996, 2nd Ed. St. Louis: Mosby-Year Book, Inc. p.211.