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Elements of Psychophysics, Volume 1. Front Cover. Gustav Theodor Fechner. Holt, Rinehart and Winston, QR code for Elements of Psychophysics. Gustav Theodor Fechner was a German philosopher, physicist and experimental psychologist. An early pioneer in experimental psychology and founder of psychophysics, .. (German); Excerpt from Elements of Psychophysics from the Classics in the History of Psychology website. Robert H. Wozniak’s Introduction to . QUARTERLY JOURNAL OF EXPERIMENTAL PSYCHOLOGY. Elements of Psychophysics, Volume I. By Gustav Fechner. Translated by Helmut E. Adler.

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In short, Weber’s law osychophysics merely the basis for the most numerous and important applications of psychic measurement, but not the universal and essential one. For as one can easily convince oneself, either from psychophyscis or from the table, the logarithm does not increase by equal increments when the corresponding number increases by equal increments. The dependence, quantitatively considered of sensation on stimulus, must finally be translated into one of sensation on the bodily processes which directly underlie the sensation — in short the psycho-physical processes; and the sensation, instead of being measured by the amount of the stimulus, will be measured by the intensity of these processes.

We will return to this statement in a special chapter chapter 18 since it is of great importance, and perhaps not directly evident to everyone. This is to be called the fundamental formulain that the deduction of all flements formulas will be based upon it.

Elements of Psychophysics

Carl Stumpf was a participant in this study. Let us suppose, as has generally been done in the attempts to preserve Weber’s law, that the difference between two stimuli, or, what is the same, the increase in one stimulus, is very small in proportion to the stimulus itself.

In short, it is nothing more than Weber’s law and the mathematical auxiliary principle united and expressed in mathematical symbols.

Green York University, Toronto, Ontario. Learn more about Amazon Prime. Ernst Mach was inspired by his work on psychophysics. Let the stimulus which is increased be called bthe small increase d bwhere the letter d is to be considered not as a special magnitude, but simply as a sign that d b is the small increment of [p.


This is Weber’s law. Write a customer review. It will always, however, be decisive for these particular conditions.

Yet, Fechner believed that his theory would never be tested; he was incorrect. The measurement formula is founded upon Weber’s law and the fact of the stimulus threshold; and both must follow in turn from it. English Choose a language for shopping. Hegel and the monadism of Rudolf Hermann Lotze.

When the number 10 is increased by 10, that is, reaches 20the logarithm corresponding to 10, which is 1, is increased to 1. On the other hand, let the sensation lsychophysics is dependent upon the stimulus b be called d g, and let the small increment of the sensation which results from the increase psychopyhsics the stimulus by d b be called d g, where d again simply expresses the small increment. Inhe also studied the still-mysterious perceptual illusion of what is still called the Fechner color effectwhereby colors are seen in a moving pattern of black and white.

It follows from the former law, that every given increment of stimulus causes an ever decreasing increment in sensation in proportion as the stimulus grows larger, and that at high values of the stimulus it is no longer sensed, while on the other hand, at low values it may appear exceptionally strong.

Would you like to tell us about a lower price? Fechner’s epoch-making work was his Elemente der Psychophysik osychophysics Artistieke fechnee psychologische experimenten met synesthesie. From this equation it follows that the sensation magnitude g is not to be considered as a simple function of the stimulus value b, but of its relation to the threshold value bwhere the sensation begins and disappears.

Gustav Fechner

Customers who viewed this item also viewed. Further, just as in physics and astronomy, so can we also in psychic measurement, neglect at first the irregularities and small departures from the law in order to discover and examine the principle relations with which the science has to do.


An internet resource developed by Christopher D. The most famous outcome of his inquiries is the psycchophysics known as the Weber—Fechner law which may be expressed as follows:. A Source Book in the History of Psychology pp.

Classics in the History of Psychology — Fechner (/)

In the case of Kepler’s law we abstract from deviations. In the case of simple lens refraction we abstract from optical aberration. This distance of a sensation from the threshold, is represented in the same manner by the negative values of gaccording to our measurement formula, as the increase above the threshold is represented by the positive values. In fact the increase of a large number b by a given amount is accompanied by a considerably smaller increase in the corresponding logarithm g, than the increase of a small number b by the same amount.

In order to do this, the relation of psychhophysics inner process to the stimulus must be known. Naturally all deduction from Weber’s law and the fact of the threshold will also be deductions from our measurement formula. Fechner’s work continues to have an influence on modern science, inspiring continued exploration of human perceptual abilities by researchers such as Jan KoenderinkFarley NormanDavid Heegerand others. In the form, that equal sensation differences correspond to equal relations of stimulus, the law may be deduced in quite an elementary manner as follows.

Fechner, Elements of Psychophysics(/)

He was remotely a disciple of Schellinglearnt much from Baruch SpinozaG. In so far as sensations, which are caused by a stimulus which is not sufficient to raise them to consciousness, are called unconscious, and those which affect consciousness are called [p. Now there is just the same difficulty with these laws as with Weber’s law. Houghton Mifflin, and was reprinted in Herrnstein, Richard J.