Thursday, May 12, 2016

The Facts of Perception by Hermann Helmholtz 1878


"The problems which that earlier period considered fundamental to all science were those of the theory of knowledge: What is true in our sense perceptions and thought? and In what way do our ideas correspond to reality?"

"[...] we can discover the lawful regularities in the processes of the external world. And natural laws assert that from initial conditions which are the same in some specific way, there always follow consequences which are the same in some other specific way."
 
“Thus, even if in their qualities our sensations are only signs whose specific nature depends completely upon our make-up or organisation, they are not to be discarded as empty appearances. They are still signs of something - something existing or something taking place - and given them we can determine the laws of these objects or these events. And that is something of the greatest importance!”
“The fact that we become aware of these effects through frequently repeated trials and observations can be demonstrated in many, many ways. Even as adults we can still learn the innervations necessary to pronounce the words of a foreign language, or in singing to produce some special kind of voice formation. We can learn the innervations necessary to move our ears, to turn our eyes inward or outward, to focus them upward or downward, and so on. The only difficulty in learning to do these things is that we must try to do them by using innervations which are unknown, innervations which have not been necessary in movement previously executed. We know these innervations in no form and by no definable characteristics other than the fact that they produce the observable effects intended. This alone distinguishes the various innervations from one another.”
"These last points should be considered more fully. The volition for a specific movement is a psychic act, and the perceptible change in sensation which results from it is also a psychic event. is it possible for the first to bring about the second by some purely mental process? It is certainly not absolutely impossible. Whenever we dream, something similar to this takes place.
While dreaming we believe that we are executing some movement, and then we dream further that the natural results of this movement occur. We dream that we climb into a boat, shove it off from shore, guide it over the water, watch the surrounding objects shift position, and so on. In cases like this it seems to the dreamer that he sees the consequences of his actions and that the perceptions in the dream are brought about by means of purely Psychical processes. Who can say how long and how finely spun, how richly elaborated, such dreams may be! If everything in dreams were to occur in ultimate accordance with the laws of nature, there would be no distinction between dreaming and waking, except that the person who is awake may break off the series of impressions he is experiencing.
I do not see how a system of even the most extreme subjective idealism, even one which treats life as a dream, can be refuted. One can show it to be as improbable, as unsatisfactory as possible (in this connection I concur with the severest expressions of condemnation), but it can be developed in a logically consistent manner, and it seems to me important to keep this in mind. How ingeniously Calderon carried out this theme in Life Is a Dream is well known.
Fichte also believed and taught that the Ego constructs the Non-Ego, that is, the world of phenomena, which it requires for the development of its Psychical activities. His idealism is to be distinguished from the one mentioned above, however, by the fact that he considered other individuals not to be dream images but, on the basis of moral laws, to be other Egos with equal reality. Since the images by which all these Egos represent the Non-Ego must be in agreement, he considered all the individual Egos to be part of or emanations from an Absolute Ego. The world in which they find themselves is the conceptual world which the World Spirit constructs. From this a conception of reality results similar to that of Hegel.”
"Science must consider thoroughly all admissible hypotheses in order to obtain a complete picture of all possible modes of explanation. Furthermore, hypotheses are necessary to someone doing research, for one cannot always wait until a reliable scientific conclusion has been reached; one must sometimes make judgments according to either probability or aesthetic or moral feelings. Metaphysical hypotheses are not to be objected to here either.”
“Insofar as we recognise a law as a power analogous to our will, that is, as something giving rise to our perceptions as well as determining the course of natural processes, we call it a force. The idea of a force acting in opposition to us arises directly out of the nature of our simplest perceptions and the way in which they occur. From the beginning of our lives, the changes which we cause ourselves by the acts of our will are distinguished from those which are neither made nor can be set aside by our will. Pain, in particular, gives us the most compelling awareness of the power or force of reality. The emphasis falls here on the observable fact that the perceived circle of presentabilia is not created by a conscious act of our mind or will. Fichte's Non-Ego is an apt and precise expression for this. In dreaming, too, that which a person believes he sees and feels does not appear to be called forth by his will or by the known relations of his ideas, for these also may often be unconscious. They constitute a Non-Ego for the dreamer too. It is the same for the idealists who see the Non-Ego as the world of ideas of the World Spirit.”
“In general, it is clear that a distinction between thought and reality is possible only when we know how to make the distinction between that which the ego can and that which it cannot change. This, however, is possible only when we know the uniform consequences which volitions have in time. From this fact it can be seen that conformity to law is the essential condition which something must satisfy in order to be considered real.”
“'All things transitory
But as symbols are sent.' [Faust]
I take it to be a propitious sign that we find Goethe with us here, as well as further along on this same path. Whenever we are dealing with a question requiring a broad outlook, we can trust completely his clear, impartial view as to where the truth lies. He demanded of science that it be only an artistic arrangement of facts and that it form no abstract concepts concerning them, for he considered abstract concepts to be empty names which only hide the facts.”
“Every inductive inference is based upon the belief that some given relation, previously observed to be regular or uniform, will continue to hold in all cases which may be observed. In effect, every inductive inference is based upon a belief in the lawful regularity of everything that happens. This uniformity or lawful regularity, however, is also the condition of conceptual understanding. Thus belief in uniformity or lawful regularity is at the same time belief in the possibility of understanding natural phenomena conceptually. If we assume that this comprehension or understanding of natural phenomena can be achieved - that is, if we believe that we shall be able to discern something fundamental and unchanging which is the cause of the changes we observe - then we accept a regulative principle in our thinking. It is called the law of causality, and it expresses our belief in the complete comprehensibility of the world.”
“Moreover, reality has always unveiled the truth of its laws to the sciences in a much richer, more sublime fashion than she has painted it for even the most consummate efforts of mystical fantasy and metaphysical speculation. What have all the monstrous offspring of indiscreet fancy, heapings of gigantic dimensions and numbers, to say of the reality of the universe, of the period of time during which the sun and earth were formed, or of the geological ages during which life evolved, adapting itself always in the most thoroughgoing way to the increasingly more moderate physical conditions of our planet?
What metaphysics has concepts in readiness to explain the effects of magnetic and induced electrical forces upon each other - effects which physics is now struggling to reduce to well-established elementary forces, without having reached any clear solution? Already, however, in physics light appears to be nothing more than another form of movement of these two agents, and the ether (the electrical and magnetic medium which pervades all space) has come to have completely new characteristics or properties.”

“'In the tides of Life, in Action's storm, A fluctuant wave,
A shuttle free,
Birth and the Grave, An eternal sea,
A weaving, flowing
Life, all-glowing,
Thus at Time's humming loom't is my hand prepares
The garment of Life which the Deity wears !' [Faust]
We are particles of dust on the surface of our planet, which is itself scarcely a grain of sand in the infinite space of the universe. We are the youngest species among the living things of the earth, hardly out of the cradle according to the time reckoning of geology, still in the learning stage, hardly half-grown, said to be mature only through mutual agreement. Nevertheless, because of the mighty stimulus of the law of causality, we have already grown beyond our fellow creatures and are overcoming them in the struggle for existence. We truly have reason to be proud that it has been given to us to understand, slowly and through hard work, the incomprehensibly great scheme of things. Surely we need not feel in the least ashamed if we have not achieved this understanding upon the first flight of an Icarus.”