Now, of all the higher functions of the brain, the ordering one, which compares the simple, pure sensations, the original experiences, and first sets them in an order of succession, viz., arranges them in time, then puts them side by side and one above another, and, not till later, one behind another, viz., arranges them in space—this function is one of the oldest. This ordering of the sense-impressions is an activity of the intellect that has nothing to do with speech, and the capacity for it is, as Immanuel Kant discovered, present in man "as he now is" (Kant) before the activity of the senses begins; but without this activity it can not assert itself.
Now, I maintain, and in doing so I take my stand upon the facts published in this book, that just as little as the intellect of the child not yet able to speak has need of words or looks or gestures, or any symbol whatever, in order to arrange in time and space the sense-impressions, so little does that intellect require those means in order to form concepts and to perform logical operations; and in this fundamental fact I see the material for bridging over the only great gulf that separates the child from the brute animal.
That even physiologists deny that there is any passage from one to the other is shown by Vierordt in his "Physiology of Infancy" (1877).
The fundamental fact that a genuinely logical activity of the brain goes on without language of any sort, in the adult man who has the faculty of speech, was discovered by Helmholtz. The logical functions called by him "unconscious inferences" begin, as I think I have shown by many observations in the newly-born, immediately with the activity of the senses. Perception in the third dimension of space is a particularly clear example of this sort of logical activity without words, because it is developed slowly.
In place of the expression "unconscious," which, because it has caused much mischief, still prevents the term "unconscious inferences" from being naturalized in the physiology of the senses and the theory of perception, it would be advisable, since "instinctive" and "intuitive" are still more easily misunderstood, to say "wordless." Wordless ideas, wordless concepts, wordless judgments, wordless inferences, may be inherited. To these belong such as our progenitors often experienced at the beginning of life, such as not only come into existence without the participation of any medium of language whatever, but also are never even willed (intended, deliberate, voluntary), and can not under any circumstances be set aside or altered, whether to be corrected or falsified. An inherited defect can not be put aside, and neither can the inherited intellect. When the outer angle at the right of the eye is pressed upon, a light appears in the closed eye at the left, not at the right; not at the place touched. This optical illusion, which was known even in Newton's day, this wordless inductive inference, is hereditary and incorrigible; and, on the other hand, the hereditary wordless concept of food can neither be prevented from arising nor be set aside nor be formed otherwise than it was formed by our ancestors.
Innate, to make it once more prominent, is the faculty (the capacity, the aptitude, the potential function) of forming concepts, and some of the first concepts are hereditary. New (not hereditary) concepts arise only after new perceptions, i. e., after experiences that associate themselves with the primitive ones by means of new connecting paths in the brain, and they begin in fact before the learning of speech.
A chick just out of the shell possesses the capacity to lay eggs—the organs necessary—in fact the future eggs are inborn in the creature; but only after some time does it lay eggs, and these are in every respect similar to the first eggs of its mother. Indeed, the chicks that come from these eggs resemble those of the mother herself; thus the eggs have hereditary properties. New eggs originate only by crossing, by external influences of all sorts, influences, therefore, of experience.
So, too, the new-born child possesses the capacity of forming concepts. The organs necessary for that are inborn in him, but not till after some time does he form concepts, and these are in all nations and at all times quite similar to the first concepts formed by the child's mother. Indeed, the inferences that attach themselves to the first concepts will resemble those which were developed in the mother or will be identical with them; these concepts have, then, hereditary properties. New concepts originate only through experience. They originate in great numbers in every child that learns to speak.
If the fact that children utterly ignorant of speech, even those born deaf, already perform logical operations with perfect correctness, proves the intellect to be independent of language, yet searching observation of the child that is learning to speak shows that only by means of verbal language can the intellect give precision to its primitive indistinct concepts and thereby develop itself further, connecting ideas appropriately with the circumstances in which the child lives.
It is a settled fact, however, that many ideas must already be formed in order to make possible the acquirement of speech. The existence of ideas is a necessary condition of learning to speak.