What Is the Connection Between Perception and Psychophysics?

Psychophysics: A branch of experimental psychology. Research on the quantitative relationship between psychological quantity and physical quantity is mainly the measurement of psychological quantity. In 1860, Fichner first proposed the concept of "psychophysics" and the experimental method specializing in psychological activities-psychophysical method, which marked the birth of the discipline. Later, through the efforts of many psychologists, a set of classic psychophysical methods was formed, which laid the foundation for psychology to become a modern experimental science. It mainly solves the two problems of sensory threshold and minimum perceptible difference measurement, and puts forward Fichner's law and Weber's law. ^[1]

Psychophysics

[English] psychophysics

[Glossary] Psychophysics-Psychophysics is a branch of psychology that studies and quantifies the relationship between mind and body. Fichner's definition is: a precise science that studies the functional relationship between mind and body or mind and body.

Perform physical stimuli and the sensations it causes

Gustav Fechner

Fichner's law, also known as Weber-Fishner's law, is a law that shows the relationship between mental and physical quantities. Named after the German physicist and founder of psychophysics GT Fischner and EH Weber, the law used to reveal the quantitative relationship between mental and physical quantities The law was developed on the basis of Weber's law.

Weber found that the same amount of difference in the same stimulus must reach a certain proportion in order to cause a difference in feeling. This ratio is a constant and is expressed by the formula: I (threshold of difference) / I (standard stimulus intensity) = k (constant / Weber score), which is Weber's law. The minimum perceptible difference (continuous difference threshold) is taken as the unit of sensory quantity, that is, each increase of the difference threshold increases the mental quantity by one unit. Perceived quantity is directly proportional to the logarithmic value of physical quantity. That is to say, the increase of sensory quantity lags behind the increase of physical quantity, physical quantity increases into geometric progression, and mental quantity increases into arithmetic progression. This empirical formula is called Fichner's law or Weber- Fichner's law. Suitable for medium intensity stimuli.

Fichner's law is a simple expression. Its formula is S = KlgR, where S is the intensity of sensation, R is the intensity of stimulus, and K is a constant. In simple terms, this law explains all human feelings, including sight, hearing, skin (including pain, itching, touch, temperature), taste, smell, electric shock, etc., all follow that feeling does not have to do with the intensity of the corresponding physical quantity It is directly proportional to the common logarithm of the intensity of the corresponding physical quantity. This law was established in the 19th century by German physicist Fichner based on his cousin and teacher Weber's law, so it is also called Weber-Fechner's law. Established as a new discipline.

Ernst Weber (179

(1) When Stevens used the quantity estimation method to make the scale, he discovered Stevens's law.

(1) Hierarchical ranking method

(2) Dual comparison method When using the dual comparison method to make an order scale, first pair the samples in pairs, and place them one by one in front of the subject, and let him pick one out of the two samples. Come like it. Because each pair of samples is presented to the subject, either left or right, or one after the other. This results in spatial or temporal errors. To eliminate these errors, subjects should be compared twice for each pair of samples. When each pair of samples appears for the second time, they appear in the same position or time as the first. The order of comparison of each pair of samples throughout the experiment is completely random. Count the number of times each sample was selected, and then line up according to the size of the number of selections. The most selected is the most popular, and so on is the sequential scale.