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It will therefore turn out that at maturity the great differences in mental functions in such a person are in part due to exercise of one function and neglect of others. But there can be no doubt that in many cases there are large original, inherited differences, the individual being poor in one aspect of mind and good in others. Feeble-minded people are usually poor in all important aspects of mind. However, one sometimes finds a feeble-minded person having musical or artistic ability, and often such a person has a good rote memory, sometimes a good verbal memory. However, the so-called higher mental functions—logical memory, controlled association, and constructive imagination—are all poor in a feeble-minded person.

Each mental function may be looked upon as in some measure independent; each is found existing in people in varying degrees from zero ability up to what might be called genius ability. The frequency curves in Fig. VI show this. Take rote memory for example. Idiots are found with practically zero ability in rote memory. At the other extreme, we find mathematical prodigies who, after watching a long freight train pass and noting the numbers of the cars, can repeat correctly the number of each car. Rote memory abilities can be found representing every step between these two extremes. This principle of distribution holds true in the case of all mental functions. We find persons practically without them, and others possessing them in the highest order, but most people are grouped about the average ability.

Detecting Mental Differences. It has already been said that mind has many different aspects and that people differ with respect to these aspects. Now let us ask how we can measure the degree of development of these aspects or functions of mind. We measure them just as we measured muscular speed as described in the first chapter. Each mental function means ability to do something—to learn, to remember, to form images, to reason, etc. To measure these different capacities or functions we have but to require that the person under consideration do something, as learn, remember, etc., and measure how well and how fast he does it, just as we would measure how far he can jump, how fast he can run, etc.

In such measurements, the question of practice is always involved. If we measure running ability, we find that some are in practice while others are not. Those in practice can run at very nearly their ultimate capacity. Those who are not in practice can be trained to run much faster than they do. To get a true measure of running capacity, we should practice the persons to be measured till each runs up to the limit of his capacity, and then measure each one’s speed. The same thing is true, to some extent, when we come to measure mental functions proper. However, the life that children live gives exercise to all fundamental functions of the mind, and unless some of the children tested have had experience which would tend to develop some mental functions in a special way, tests of the various aspects of learning capacity, memory, association, imagination, etc., are a fairly good measure of original, inherited tendencies.

Of course, it must be admitted that there are measurable differences in the influence of environment on children, and when these differences are extreme, no doubt the influence is shown in the development of the child’s mind. A child reared in a home where all the influences favor its mental development, ought to show a measurable difference in such development when compared with a child reared in a home where all the influences are unfavorable. It is difficult to know to what extent this is true, for the hereditary and environmental influences are usually in harmony, the child of good hereditary stock having good environmental influences, and vice versa. When this is not the case, i.e. when a child of good stock is reared under poor environmental influences, or when a child of poor stock is reared under good influences, the results seem to show that the differences in environment have little effect on mental development, as far as the fundamental functions are concerned, except in the most extreme cases.

Each mental function is capable of some development. It can be brought up to the limit of its possibilities. But recent experiments indicate that such development is not very great in the case of the elementary, fundamental functions. Training, however, has a much greater effect on complex mental activities that involve several functions. Rote memory is rather simple; it cannot be much affected by training. The memory for ideas is more complex; it can be considerably affected by training. The original and fundamental functions of the mind depend upon the nature of the nervous system which is bequeathed to us by heredity. This cannot be much changed. However, training has considerable effect on the coördinations and combinations of mental functions. Therefore, the more complex the mental activities which we are testing, the more likely they are to have been affected by differences in experience and training.

If we should designate the logical memory capacity of one person by 10, and that of another by 15, by practice we might bring the first up to 15 and the second to 22½, but we could not equalize them. We could never make the memory of the one equal to that of the other. In an extreme case, we might find one child whose experience had been such that his logical memory was working up to the limit of its capacity, while the other had had little practice in logical memory and was therefore far below his real capacity. In such a case, a test would not show the native difference, it would show only the present difference in functioning capacity.

Fairly adequate tests for the most important mental functions have been worked out. A series of group tests with directions and norms follow. The members of the class can use these tests in studying the individual differences in other people. The teacher will find other tests in the author’s Examination of School Children, and in Whipple’s Manual of Mental and Physical Tests.

MENTAL TESTS General Directions

The results of the mental tests in the school will be worse than useless unless the tests are given with the greatest care and scientific precision. Every test should be most carefully explained to the children so that they will know exactly what they are to do. The matter must be so presented to them that they will put forth all possible effort. They must take the tests seriously. Great care must be taken to see that there is no cheating. The work of each child should be his own work. In those tests in which time is an important element, the time must be carefully kept, with a stop watch if one is available. The papers should be distributed for the tests and turned face downward on the pupil’s desk. The pupil, when all are ready to begin, should take the paper in his hand and at the signal “begin” turn it over and begin work, and when the signal “stop” is given, should quit work instantly and turn the paper over. Before the work begins, the necessary information should be placed on each paper. This information should be the pupil’s name, age, grade, sex, and school. This should be on every paper. When the test is over the papers should be immediately collected.

Logical Memory

Object. The purpose of this test is to determine the pupil’s facility in remembering and reproducing ideas. A pupil’s standing in the test may serve as an indication of his ability to remember the subject matter of the school studies.

Figure VII—Logical Memory—“Willie Jones”

Figure VII—Logical Memory—“Willie Jones”

Method. The procedure in this test is for the teacher to read slowly and distinctly the story to be reproduced. Immediately after the reading the pupils are to write down all of the story that they can recall. They must not begin to write till after the reading. Ten minutes should be allowed for the reproduction. This is ample time, and each pupil should be told to use the whole time in working on his reproduction. At the end of ten minutes, collect the papers. Care should be taken to see that each pupil does his own work, that there is no copying. Before reading the story, the teacher should give the following instructions:

I shall read to you a story entitled “Willie Jones and His Dog” (or “A Farmer’s Son,” or “A Costly Temper,” as the case may be). After I have read the story you are to write down all you can remember of it. You are not to use the exact words that I read unless you wish. You are to use your own words. Try to recall as much as possible and write all you recall. Try to get all the details, not merely the main facts.

Material. For grades three, four, and five, use “Willie Jones and His Dog”; for grades six, seven, and eight, use “A Farmer’s Son”; for the high school, use “A Costly Temper.” The norms for the latter are based on eighth grade and high school pupils.

WILLIE JONES AND HIS DOG

Willie | Jones | was a little | boy | only | five years old. | He had a dog | whose name was Buster. | Buster was a large | dog | with long, | black, | curly | hair. | His fore | feet | and the tip | of his tail | were white. | One day | Willie’s mother | sent him | to the store | which was only | a short | distance away. | Buster went with him, | following behind. | As Buster was turning | at the corner, | a car | struck him | and broke | one | hind | leg | and hurt | one | eye. | Willie was | very | sorry | and cried | a long | time. | Willie’s father | came | and carried | the poor | dog | home. | The broken leg | got well | in five | weeks | but the eye | that was hurt | became blind. |

A FARMER’S SON

Will | was a farmer’s | son | who attended school | in town. | His clothes | were poor and his boots | often smelled | of the farmyard | although he took great | care of them. | Since Will had not gone to school | as much | as his classmates, | he was often | at a disadvantage, | although his mind | was as good | as theirs,—| in fact, he was brighter | than most | of them. | James, | the wit | of the class, | never lost an opportunity | to ridicule | Will’s mistakes, | his bright | red | hair, | and his patched | clothes. | Will | took the ridicule | in good part | and never | lost his temper. | One Saturday | as Will | was driving | his cows | to pasture, | he met James | teasing | a young | child, | a cripple. | Will’s | indignation | was aroused | by the sight. | He asked | the bully | to stop, | but when he would not, | Will pounced | upon him | and gave him | a good | beating, | and he would not | let James go | until he promised | not to tease | the crippled | child | again. |

A COSTLY TEMPER

A man | named John | Murdock | had a servant | who worried him | much by his stupidity. | One day | when this servant was more |

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