Embryology
Hearing and Seeing
Scientific Context
The Sequence of Sensory Development
Within hours of being born, a baby can tell the difference between a language it has heard for months and one it has never heard. The test is simple. A French newborn, lying still in a hospital bassinet, hears a recording in Russian. A pressure sensor in its dummy registers that the baby is sucking the way it sucks for interesting sounds. Then the language switches to French, the language its mother has been speaking to it for the last third of pregnancy. The sucking pattern changes. The baby has noticed.
The finding is the work of Jacques Mehler and colleagues at the Centre National de la Recherche Scientifique in Paris. In a 1988 paper in Nature, Mehler's team showed that newborns discriminate their mother's native language from a foreign one within hours of birth, using only rhythmic cues. They cannot yet understand a word in either language. They can hear that one is theirs. The recognition was assembled in the dark, in fluid, by an organ that is essentially adult-sized halfway through pregnancy. The cochlea, the spiral structure in the inner ear that does the actual work of converting sound into nerve signals, reaches its full adult dimensions by the twentieth week of gestation. By the twenty-fourth week, the fetus is already responding to sounds from outside the womb.
The eye, by contrast, is still unfinished. The retina, the optic nerve, and the visual cortex are not done at birth. There is no light in the womb to drive their development, and the eye's task for most of gestation is something closer to rehearsal than seeing. Even after delivery, a newborn can detect light and motion but cannot focus clearly or perceive colour for weeks. The ear is the only one of the major senses that is fully online before birth, and for a simple reason: in a place without light, it is the only one of the senses that has anything to do.
This means that for the last third of pregnancy, the human brain is being shaped by an input channel that the other senses cannot yet use. A fetus is being given the contours of its mother's voice, the rhythm of her language, the pitch patterns of the household around it, all of it arriving through a single door. The brain that will eventually integrate sight, sound, and thought is, for the moment, an ear with a body attached to it. Whatever it learns in those months, it learns by listening.
Islamic Context
وَاللَّهُ أَخْرَجَكُم مِّن بُطُونِ أُمَّهَاتِكُمْ لَا تَعْلَمُونَ شَيْئًا وَجَعَلَ لَكُمُ السَّمْعَ وَالْأَبْصَارَ وَالْأَفْئِدَةَ ۙ لَعَلَّكُمْ تَشْكُرُونَ
And Allah brought you out of the wombs of your mothers knowing nothing, and gave you hearing and sight and hearts, that perhaps you may be grateful.
— Quran 16:78
The verse names three faculties of the human being in a fixed order: al-samʿ (hearing), al-abṣār (sight), and al-af'ida (hearts, in the sense of minds or understanding). The list is not a survey of the senses in general. The Arabic places them in the order hearing, then sight, then the seat of understanding — and the order is the same each time the same list appears in the Qur'an.
The same sequence occurs in at least six other passages. 67:23 reads, "It is He Who created for you hearing, and sight, and hearts — little of thanks do you give." 32:9 reads, "He shaped you and perfected your forms, and gave you hearing and sight and hearts." 76:2 reads, "We have created man from a drop of mingled sperm, and We made him hearing and seeing." 46:26 reads, "We had established them in such as We have not established you, and We made for them hearing and vision and hearts." In each of these, the ear is named before the eye, and the heart is named last. The order is not inverted in a single one of them.
Ma'arif al-Qur'an notes that the very first knowledge a person has comes through the ear. The classical reading points out that in the beginning, the eyes are closed and the ears hear. That is a description of the human being in the early stages of life, when the organs of sight are not yet in use. The Qur'an places the ear first in its list of human faculties, and the classical tradition explains the placement by reference to a stage in which the ear is the only faculty of the three that is operative.
The list is not a flourish. The ear, the eye, and the heart are the classical triad of human faculties — the categories under which all perception and understanding is grouped. The word the verse uses for the third of these is not the everyday Arabic word for heart, qalb, but fu'ād — the classical term for the most intense seat of inner experience, the place where understanding and feeling become most acute. The Quranic sense of fu'ād is the cognitive faculty at its most concentrated, not the cardiac organ. On this reading, the third item in the verse's list aligns with the integration of sensory input into understanding, the slowest of the three developments. The Qur'an takes these three and lists them in an order that holds across separate surahs, in different rhetorical settings, in verses that are not about development at all.
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The Connection
The Qur'anic triad—hearing, then sight, then understanding—is not merely a rhetorical list; it is a precise developmental sequence. Embryology confirms this order: the ear is fully functional midway through gestation, while the visual system remains incomplete at birth, and the capacity for cognitive integration (fu'ād) is the final faculty to reach maturity. The text consistently preserves this specific order across multiple surahs, reflecting the actual timeline of how a human being gains the capacity to perceive and comprehend the world.
