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diversity, and in their course arousing millions of emerging, waning, and vanishing impressions. It is this that Goethe means when he depicts in such splendid language how

      ‘… ein Tritt tausend Fäden regt,

       Die Schifflein herüber, hinüber schiessen,

       Die Fäden ungesehen fliessen,

       Ein Schlag tausend Verbindungen schlägt.’[71]

      Now, memory is a property not only of the nerve-cell, but also of the nerve-fibre, which is only a modification of the cell. The fibre has a recollection of the stimulus which it conveyed, in the same way as the cell has of that which it has transformed into presentation and motion. A stimulus will be more easily conducted by a fibre which has already conveyed it, than by one which propagates it for the first time from one cell to another. Every stimulus which reaches a cell will take the line of least resistance, and this will be set out for it along those nerve-tracks which it has already traversed. Thus a definite path is formed for the course of a stimulus-wave, a customary line of march; it is always the same nerve-cells which exchange mutually their stimulus-waves. Presentation always awakens the same resulting presentations, and always appears in consciousness accompanied by them. This procedure is called the association of ideas.

      It is neither volition nor accident that determines to which other cells a disturbed cell habitually communicates its stimulus, which accompanying impressions an aroused presentation draws with it into consciousness. On the contrary, the linking of presentations is dependent upon laws which Wundt especially has well formulated.

      Those who have not been born blind and deaf (like the unfortunate Laura Bridgman, cited by all psychologists) will never be influenced by one external stimulus only, but invariably by many stimuli at once. Every single phenomenon of the outer world has, as a rule, not only one quality, but many; and since that which we call a quality is the assumed cause of a definite sensation, it results that phenomena appeal at once to several senses, are simultaneously seen, heard, felt, and moreover are seen in different degrees of light and colour, heard in various nuances of timbre, etc. The few phenomena which possess only one quality and arouse therefore only one sense, e.g., thunder, which is only heard, although with varying intensity, occur nevertheless in conjunction with other phenomena, such as, to keep to thunder, with a clouded sky, lightning and rain. Our brains are therefore accustomed to receive at once from every phenomenon several stimuli, which proceed partly from the many qualities of the phenomenon itself, and partly from the phenomena usually accompanying it. Now, it is sufficient that only one of these stimuli should reach the brain, in order to call into life, in virtue of the habitual association of the memory-images, the remaining stimuli of the same group as well. Simultaneity of impressions is therefore a cause of the association of ideas.

      One and the same quality belongs to many phenomena. There is a whole series of things which are blue, round, and smooth. The possession of a common quality is a condition of similarity, which is greater in proportion to the number of common qualities. Every single quality, however, belongs to a habitually associated group of qualities, and can by the mechanism of simultaneity arouse the memory-image of this group. In consequence of their similarity, therefore, the memory-images can be aroused of all those groups, which resemble each other in some quality. The colour blue is a quality which belongs equally to the cheerful sky, the cornflower, the sea, certain eyes, and many military uniforms. The perception of blue will awaken the memory of some or many blue things which are only related through their common colour. Similarity is therefore another cause of the association of ideas.

      It is a distinctive characteristic of the brain-cell to elaborate at the same time both a presentation and its opposite. It is probable that what we perceive as its opposite is generally, in its original and simplest form, only the consciousness of the cessation of a certain presentation. As the fatigue of the optic nerve by a colour arouses the sensation of the complimentary colour, so, on the exhaustion of a brain-cell through the elaboration of a presentation, the contrary presentation appears in consciousness. Now, whether this interpretation be right or not, the fact itself is established through the ‘contradictory double meaning of primitive roots,’ discovered by K. Abel.[72] Contrast is the third cause of the association of ideas.

      Many phenomena present themselves in the same place close to, or after, one another; and we associate there, presentation of the particular place with those objects, to which it is used to serve as a frame. Simultaneity, similarity, contrast, and occurrence in the same place (contiguity), are thus, according to Wundt, the four conditions under which phenomena will be connected in our consciousness through the association of ideas. To these James Sully[73] believes yet a fifth should be added: presentations which are rooted in the same emotion. Nevertheless all the examples cited by the distinguished English psychologist demonstrate without effort the action of one or more of Wundt’s laws.

      In order that an organism should maintain itself, it must be in a position to make use of natural resources, and protect itself from adverse conditions of every sort. It can accomplish this only if it possesses a knowledge of these adverse conditions, and of such natural resources as it can use; and it can do this better and more surely the more complete this knowledge is. In the more highly differentiated organism it devolves upon the brain and nervous system to acquire knowledge of the outer world, and to turn that knowledge to the advantage of the organism. Memory makes it possible for the brain to perform its task, and the mechanism by which memory is made to serve the purport of knowledge is the association of ideas. For it is clear that a brain, in which a single perception awakens through the operation of the association of ideas a whole train of connected representations, will recognise, conceive and judge far more rapidly than one in which no association of ideas obtains, and which therefore would form only such concepts as had for their content direct sense-perceptions and such representations as originated in those cells which, by the accident of their contiguity, happened to lie in the circuit of a stimulus-wave. For the brain which works with association of ideas, the perception of a ray of light, of a tone, is sufficient, in order instantly to produce the presentation of the object from which the sensation proceeds, as well as of its relations in time and space, to group these presentations as concepts, and from these concepts to arrive at a judgment. To the brain without association of ideas that perception would only convey the presentation of having something bright or sonant in front of it. In addition, presentations would be aroused which had nothing in common with this bright or sonant something; it could form no image of the exciter of the sense, but it would first have to receive a train of further impressions from several or all of the senses, in order to learn to recognise the various properties of the object, of which at first only a tone or a colour was perceived, and to unite them in a single presentation. Even then the brain would only know in what the object consisted, i.e., what it had in front of it, but not how the object stood in relation to other things, where and when it had already been perceived, and by what phenomena it was accompanied, etc. Knowledge of objects thus acquired would be wholly unadapted to the formation of a right judgment. It can now be seen what a great advantage was given to the organism in the struggle for existence by the association of ideas, and what immense progress in the development of the brain and its activity the acquirement of it signified.

      But this is only true with a limitation. The association of ideas as such does not do more to lighten the task of the brain in apprehending and in judging than does the uprising throng of memory-images in the neighbourhood of the excited centre. The presentations, which the association of ideas calls into consciousness, stand, it is true, in somewhat closer connection with the phenomenon which has sent a stimulus to the brain, and by the latter has been perceived, than do those occurring in the geometrical circuit of the stimulus-wave; but even this connection is so slight, that it offers no efficient help in the interpretation of the phenomenon. We must not forget that properly all our perceptions, ideas, and conceptions are connected more or less closely through the association of ideas. As in the example cited above the sensation of blue arouses the ideas of the sky, the sea, a blue eye, a uniform, etc., so will each of these ideas arouse in its turn, according to Wundt’s law, ideas associated with them. The sky will arouse the idea of stars, clouds and rain; the sea, that of ships, voyages, foreign lands, fishes, pearls, etc.; blue eyes, that of a girl’s face, of love and all its emotions; in short, this one sensation, through the mechanism of the association

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