The Healing of the Quran (study on American participants)

Healing and Mercy
"We send down (stage by stage) in the Quran, that which is a healing and mercy."

The results of researches conducted over a group of volunteers from the USA who were subject to a recitation of the Quran were striking. A trace of a tranquilizing effect was recorded on 97% of the participants. Although many of these volunteers did not know Arabic, they nonetheless experienced involuntary physiological changes that led to notable alleviation in the acuity of tension they were observed to possess in their nervous systems prior to the experiment.

Furthermore, an EEG experiment during the Quran recitation revealed that the encephalic waves moved at a slower pattern, indicating a state of deep calmness. Non-Arabic speaking people felt assured, quite, and relaxed when listening to the Quranic verses, in spite of their inability to understand their meaning. This is one the miracles of the Holy Quran.

The Prophet, peace be upon him, revealed this miracle by saying, "People assembled in one of the houses of Allah (Mosques), and who recite and study the Book of Allah, find that a tranquility prevails over them, and that mercy encompasses them, and that the angels surround them, and that Allah mentions them in the presence of those near Him."

Source:
"Medical Miracales of the Quran" - Dr. Sharif Kaf Al-Ghazal. The Islamic Foundation, UK. p. 104-105.