The current psychological doctrine of mental "types" rests upon a great mass of facts, drawn in the first instance from the different kinds of mental trouble, especially those which involve derangements of speech—the different kinds of Aphasia. The broadest generalization which is reached from these facts is that which marks the distinction, of which I have already said so much, between the motor and the sensory types. But besides this general distinction there are many finer ones; and in considering the persons of the sensory type, it is necessary to inquire into these finer distinctions. Not only do men and children differ in the matter of the sort of mental material which they find requisite, as to whether it is pictures of movements on the one hand, or pictures from the special senses on the other hand; but they differ also in the latter case with respect to which of the special senses it is, in this case or that, which gives the particular individual his necessary cue, and his most perfect function. So we find inside of the general group called "sensory" several relatively distinct cases, all of which the teacher is likely to come across in varying numbers in a class of pupils. Of these the "visual" and the "auditory" are most important.

There are certain aspects of the case which are so common to all the cases of sensory minds, whether they be visual, auditory, or other, that I may set them out before proceeding further.

First, in all these matters of type distinction, one of the essential things to observe is the behaviour of the Attention. We have already seen that the attention is implicated to a remarkable degree—in what I called "fluid attention" above—in the motor scholar. The same implication of the attention occurs in all the sensory cases, but presents very different aspects; and the common fact that the attention is directly involved affords us one of the best rules of judgment and distinction. We may say, generally, of the sensory children, that the attention is best, most facile, most interest-carrying for some one preferred sense, leading for this sense into preoccupation and ready distraction. This tendency manifests itself, as we saw above, in the motor persons also, taking effect in action, speed, vivacity, hasty generalization, etc.; but in the sensory one it takes on varying forms. This first aspect of our typical distinction of minds we may call "the relation of the 'favoured function' to the attention."

Then, second, there is another and somewhat contrasted relation which also assumes importance when we come to consider individual cases; and that is the relation of the "favoured function"—say movement, vision, hearing, etc.—to Habit. It is a common enough observation, that habit renders functions easy, and that habits are hard to break; indeed, all treatment of habits is likely to degenerate into the commonplace. But, when looked at as related to the attention, certain truths emerge from the consideration of habit.

In general, we may say that habit bears a twofold relation to attention: on the one hand, facile attention shows the reign of habit. The solid acquisitions are those with which attention is at home, and which are therefore more or less habitual. But, on the other hand, it is equally true that attention is in inverse ratio to habit. We need to attend least to these functions which are most habitual, and we have to attend most to those which are novel and only half acquired. We get new acquisitions mainly, indeed, by strained attention. So we have a contrast of possible interpretations in all cases of sharp and exclusive attention by the children: does the attention represent a Habit in this particular action of the child?—or, does it represent the breaking up of a habit, an act of Accommodation? In each case these questions have to be intelligently considered. The motor person, usually, when uninstructed and not held back, uses his attention under the lead of habit. It is largely the teacher's business in his case, as we saw, to get him to hold, conserve, and direct his attention steadily to the novel and the complex. The sensory person, on the other hand, shows the attention obstructed by details, hindered by novelties, unable to pass smoothly over its acquisitions, and in general lacking the regular influence of habit in leading him to summarize and utilize his mental store in general ways.

The third general aspect of the topic is this: the person of the sensory type is more likely to be the one in whom positive derangement occurs in the higher levels, and in response to the more refined social and personal influences. This, for the reason that this type represents brain processes of greater inertia and complexity, with greater liability to obstruction. They are slower, and proceed over larger brain areas.

With these general remarks, then, on the wider aspects of the distinction of types, we may now turn to one of the particular cases which occurs among sensory individuals. This is all that our space will allow.

The Visual Type.—The so-called "visuals," or "eye-minded" people among us, are numerically the largest class of the sensory population. They resort to visual imagery whenever possible, either because that is the prevailing tendency with them, or because, in the particular function in question in any special act, the visual material comes most readily to mind. The details of fact regarding the "visuals" are very interesting; but I shall not take space to dwell upon them. The sphere in which the facts regarding the pupil of this type are important to the teacher is that of language, taken with the group of problems which arise about instruction in language. The question of his symbolism, and its relations to mathematics, logic, etc., is important. And finally, the sphere of the pupil's expression in all its forms. Then, from all his discoveries in these things, the teacher is called upon to make his method of teaching and his general treatment suitable to this student.

The visual pupil usually shows himself to be so predominately in his speech and language functions; he learns best and fastest from copies which he sees. He delights in illustrations put in terms of vision, as when actually drawn out on the blackboard for him to see. He understands what he reads better than what he hears; and he uses his visual symbols as a sort of common coin into which to convert the images which come to him through his other senses. In regard to the movements of attention, we may say that this boy or girl illustrates both the aspects of the attention-function which I pointed out above; he attends best—that is, most effectively—to visual instruction provided he exert himself; but on the other hand, it is just here that the drift of habit tends to make him superficial. As attention to the visual is the most easy for him, and as the details of his visual stock are most familiar, so he tends to pass too quickly over the new matters which are presented to him, assimilating the details to the old schemes of his habit. It is most important to observe this distinction, since it is analogous to the "fluid attention" of the motor scholar; and some of the very important questions regarding correlation of studies, the training of attention, and the stimulation of interest depend upon its recognition. Acquisition best just where it is most likely to go wrong; that is the state of things. The voluntary use of the visual function gives the best results; but the habitual, involuntary, slipshod use of it gives bad results, and tends to the formation of injurious habits.

For example, I set a strongly visual boy a "copy" to draw. Seeing this visual copy he will quickly recognise it, take it to be very easy, dash it off quickly, all under the lead of habit; but his result is poor, because his habit has taken the place of effort. Once get him to make effort upon it, however, and his will be the best result of all the scholars, perhaps, just because the task calls him out in the line of his favoured function. The same antithesis comes out in connection with other varieties of sensory scholars.