Of voluntary attempts to imitate sounds, the most noteworthy were the efforts to give the noise heard on the winding of a time-piece, and to repeat tones sung.
The associations of words heard with seen, tangible objects on the one hand, and, on the other hand, with definite co-ordinated muscular movements, have become considerably more numerous. Thus the following are already correctly distinguished, being very rarely confounded: Uhr (clock), Ohr (ear); Schuh (shoe), Stuhl (chair), Schulter (shoulder), Fuss (foot); Stirn (forehead), Kinn (chin); Nase (nose), blasen (blow); Bart (beard), Haar (hair); heiss (hot), Fleisch (meat).
In addition to the above, eye, arm, hand, head, cheek, mouth, table, light, cupboard, flowers, are rightly pointed out.
The child so often obeys the orders he hears—"run," "kick," "lie down," "cough," "blow," "bring," "give," "come," "kiss"—that when he occasionally does not obey, the disobedience must be ascribed no longer, as before, to deficient understanding, but to caprice, or, as may be discerned beyond a doubt from the expression of his countenance, to a genuine roguishness. Thus the spoken consonants are at last surely recognized in their differences of sound.
In the eighteenth month this ability of the ear to discriminate, and with it the understanding of spoken words, increases. "Finger, glass, door, sofa, thermometer, stove, carpet, watering-pot, biscuit," are rightly pointed out, even when the objects, which were at first touched, or merely pointed at, along with loud and repeated utterance of those words, are no longer present, but objects like them are present. Say "Finger," and the child takes hold of his own fingers only; "Ofen" (stove), then he invariably at first looks upward ("oben"). Besides the earlier commands, the following are correctly obeyed: "Find, pick up, take it, lay it down." Hand him a flower, saying, "Smell," and he often carries it to his nose without opening his mouth.
The repeating of syllables spoken for him is still rare; "mamma" is responded to by ta. The voluntary repeating of syllables heard by chance is likewise rare; in particular, "jaja" is now repeated with precision.
The atta, which used to be whispered when anything disappeared from the child's field of vision, has changed to tto and t-tu and ftu, with pouting of the lips.
In the monologues appear näi, mimi, päpä, mimiä, pata, rrrrr, the last uvular and labial for minutes at a time. But these meaningless utterances are simply signs of well-being in general, and are gladly repeated from pleasure in the exercise of the tongue and lips. The tongue still vibrates vigorously with fibrillar contractions when it is at rest, the mouth being open.
Characteristic for this period is the precision with which the various moods of feeling are expressed, without articulate sounds, by means of the voice, now become very high and strong, in screaming and crowing, then again in wailing, whimpering, weeping, grunting, squealing; so that the mood is recognized by the voice better than ever before, especially desire, grief, joy, hunger, willfulness, and fear. But this language can not be represented by written characters.
The same holds good of the nineteenth month, in which bawling and babbling are more rare, the spontaneous sound-imitations are more frequent, the vocal cords are strained harder, the mechanism of articulation works with considerably more ease; the understanding and the retention of spoken words have perceptibly increased, but no word of the child's own, used always in the same sense, is added.