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ones constantly used in psychology, and are briefly defined that there may be no haziness in their application.

Sensation is the uninterpreted response of the mind to stimuli brought by sense organs.

Examples: Feeling of { hot. cold. pain.

Sensation may arouse instinct and cause reflex action, or start a feeling state, or a train of thought.

Perception is the conscious recognition of the cause of a given sensation.

Example: { fluid—water. cold—snow. pain—cut.

Percept is a word often used to denote the mind’s immediate image of the thing perceived.

Percepts are of two kinds: object and quality.

Example: { object, as water. quality, as fluid.

Memory is the mind’s faculty of retaining, recognizing, and reproducing sensations, percepts, and concepts.

Organic memory is the mind’s reproduction of past bodily sensations.

Example: I recall the physical sensations of a chill, and live it over in my mind, so that I can accurately describe how a chill feels to me, though I can but surmise how one feels to you.

Inorganic memory is the mind’s reproduction of its own reactions in the past.

Example: Myself having a chill, how I acted; what I thought and my emotions during that chill.

Ideation is the mind’s grouping of percepts by the aid of memory, to form concepts.

Example: I perceive color, form, mouth, eyes, nose, chin, etc. These percepts I combine as a result of past experience (memory) to form my concept, face; and the process of combining is ideation.

Concepts are mental representations of things or qualities, i. e., of object or quality percepts.

We might say that the percept is the mind’s immediate image of a thing or quality, and the concept is the result of the storing up and grouping and recombining of percepts. Thus a lasting mental picture is secured; and my idea of horse, for instance, is so clear and definite a thing in my mind that if I should never again see a particular horse, I should yet always be able to think accurately of a horse.

Concepts are of two kinds—concrete and abstract.

A concrete concept, or concrete idea (for concept and idea are interchangeably used), is an idea of a particular object or quality.

Examples:  This wine-sap apple (object concept). This sweet orange (quality concept).

An abstract concept, or abstract idea, is a mental reproduction of a quality or an object dissociated from any particular setting or particular experience.

Abstract ideas are of two kinds. We speak of them as abstract object concepts and as abstract quality concepts. An abstract object concept we might call a generalized idea, an idea comprehending all objects having certain things in common.

Example: My idea of animal includes many scores of very different individual animals, but they all have bodies and heads and extremities. They all have some kind of digestive apparatus; they breathe, and can move.

An abstract quality concept is easier to think than to explain. It is as though the mind in considering a multitude of different objects found a certain quality common to many of them, and it “abstracted,” i. e., drew this particular quality, and only this, from them all, and then imagined it as a something in itself which it calls redness, or whiteness, or goodness. Thereafter, whenever it finds something like it anywhere else again it says, “That is like my redness.” So I call it “red.” In other words, consciousness thereafter can determine in a newly discovered object something it knows well merely because that something corresponds to a representation which experience and memory have already formed.

These comprehensive concepts, or universals, as some psychologists term them, the mind, having pieced together from experience and memory, holds as independent realities, not primarily belonging to this or that, but lending themselves to this or that. For example: My mind says “white,” and sees white in some object. But I see the white only because my mind has a quality concept, whiteness. This outside object corresponds to my concept. I recognize the likeness and call it “white.”

I speak of goodness, or purity, of benevolence; or of fulness, emptiness, scantiness. There is no object or quality in the outside world I can say is goodness, or fulness. But I do see things in the external world through my ideas of goodness or fulness that correspond to these ideas. They have some of the qualities the ideas embrace; and so I point them out and say, “This represents purity; that, impurity”; or, “This is full, that is empty.” One satisfies my concept of purity, while the other does not. One fulfils my concept of fulness; the other does not. And because we can never point out any one quality in the outside world and say “This is purity, and all of purity; this is goodness; or this good plus this good plus this makes all of goodness”; because of this impossibility we speak of these concepts as having reality somewhere. They are absolutes, universals, abstract quality concepts—the unfound all of which the things we call pure and good are but the part.

Apperception is the process of comparing the new with all that is in the mind, and of classifying it by its likeness to something already there.

With an abstract idea of an object in mind we very deftly, through the use of memory and constructive imagination, deduce the whole from the part recognized as familiar.

Example: In walking through the field, along the bank of the brook, I glimpse under the low-hanging branches of the weeping willow a restlessly moving hoof. I see a certain kind of hoof and only that. Or I hear a lowing sound. And I say “cow.” I have not seen a cow, but only a part which tells me a cow is there; for all the cows I ever saw had hoofs of that general description, and so it fits into my concept cow, and into no others. Or I have heard cows, only, give that lowing sound before. From my perception, then, of hoof or sound I apperceive cow. Memory relates that hoof or that lowing sound to a certain kind of animal known in the past; and constructive imagination draws in all the rest of the picture that belongs with it.

Again, we may apperceive an object or quality from our recognition of something which in our experience has been associated, under those particular circumstances, with only that object or quality. I see smoke on the ocean’s far horizon, and I decide instantly, “a steamer.” I have not perceived any steamer, but only something that “goes with it,” as it were. I see the ship with my mind, not with my eyes; for I know that a cloud of smoke out there always has, in my past experience, represented just that. I compare the newly appearing stimulus—smoke in that particular location—with all that is associated with it in my mind, and classify it with the known. I apperceive “steamer.”

In apperception, then, we construct from the known actually perceived by the senses, the unknown. How does the child realize that the moving speck on the distant hillside is his father? There is nothing to indicate it except that it is black and moves in this direction. But experience tells Johnny that father comes home that way just about this time. Moreover, it says that father looks so when at that distance. When Johnny is as sure it is his father as if he could see his face close beside him he has apperceived him. The speck on the hill is the newly arriving stimulus. Johnny compares it with what corresponds to it in his mind’s experience and proclaims, as a fact, that he sees his father.

Reason is the mind’s comparison and grouping of concepts to form judgments, and its association of judgments to form new judgments.

Example: My concept man includes the eventual certainty of his death. My concept mortal means “subject to death.” Therefore my judgment is, “Man is mortal.” Reason has compared the concepts and found that the second includes the first.

Judgment is the mind’s decision arrived at through comparing concepts or other judgments.

Example: Man is mortal is my decision after comparing the concepts man and mortal and finding that the latter really includes the former. Judgment at the same time says that “Mortals are men,” is not a true conclusion. For in this case the first concept is not all included in the second. Mortals are all life that is subject to death.

We may assume personal consciousness even as we recognize an individual body. Psychology does not deal with any awareness separated from a person. It knows no central mind of which you partake or I partake, and which is the same for us both. A universal consciousness would simply mean one which is the sum of yours and mine and everybody’s who lives today, or who has ever lived. So by personal consciousness the psychologist means his consciousness, or yours, or mine. But they can never be the same; for mine is determined by my entire past and by how things and facts and qualities affect me; and yours, by your past, and by things and facts and qualities, and by how they affect you.

Personal consciousness is the mind’s recognition of self; and as the self changes with every added experience, so personal consciousness is modified.

Stream of thought is a term James has brought into common usage to illustrate the fact, already stressed, that thinking, as we know it, is never static, is never one thing, one percept, one concept, one judgment; but is a lot of these all together, just beginning to be or just beginning to change into something else. We never know a concept, for instance, except as it is a part of our entire consciousness, related to all the rest; just as we do not know the drop of water in the brook as it flows with the stream. We can take up one on our finger-tips, however, and separate it from all the rest. But analyzed in the laboratory, this drop will contain all the elements that a pint or gallon or a barrel of the same water contains. The drop is what it is because the stream has a certain composition. We only have a brook as drops of rain combine to make it, but we also have only the drops as we separate them from the steam.

Imagination is the combining by the mind, in a new way, things already known.

This may be either into fantastic groupings divorced from reality, or into new, possible, rational groupings not yet experienced. So imagination is of two kinds, the fantastic and the constructive. Fantastic imagination, or fantasy, gives us gnomes, fairies, giants, and flying horses, and all the delights of fairy tales. Constructive imagination is the basis for invention, for literature, and the arts and sciences.

The word thinking, defined early in this chapter, is broadly used to denote the sum of all the intellectual faculties. Thinking is really the stream of thought.

CHAPTER VI
THE NORMAL MIND (Continued) Instinct

We have found that the mind’s chief end is action, of itself, or of its body. But what are its incentives to action?

We see the very young baby giving evidences of an emotional life, living in an affective, or feeling environment, leading a pleasure-pain existence, from the first. He acts as desire indicates. But from the very moment of his birth he performs actions with which he cannot as yet have a sense-memory connection, because he is doing them for the first time. How can he know how to respond to stimuli from the very beginning?

No other possible explanation offers itself than that he is born with certain tendencies to definite action. These we call instincts—man’s provision to keep him going, as it were, till reason develops. Instincts are handed down from

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