The area of the cerebrum responsible for planning, motivation, and initiating good and sinful behaviour, such as lying and truth-telling, is located in the frontal part of the skull. This region, known as the prefrontal area, was pointed out in the Qur'an 1,400 years ago, and only discovered by scientists in the last 60 years. Those who fail to act responsibly can be grabbed by the 'lying, sinful forelock', indicating the importance of being responsible.

Note 67. Rod R. Seeley, Trent D. Stephens, and Philip Tate, Essentials of Anatomy & Physiology, 2nd ed., (St. Louis: Mosby-Year Book Inc.: 1996), 211; Charles R. Noback, N. L. Strominger, and R. J. Demarest, The Human Nervous System, Introduction and Review, 4th ed., (Philadelphia: Lea & Febiger: 1991), 410-411.
Note 68. Seeley, Stephens, and Tate, Essentials of Anatomy & Physiology, 211.