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psychophysics
psy·cho·phys·ics P0636400 (sī′kō-fĭz′ĭks)n. (used with a sing. verb) The branch of psychology that deals with the relationships between physical stimuli and sensory response.
psy′cho·phys′i·cal adj.psy′cho·phys′i·cal·ly adv.psy′cho·phys′i·cist (-fĭz′ĭ-sĭst) n.psychophysics (ˌsaɪkəʊˈfɪzɪks) n (Psychology) (functioning as singular) the branch of psychology concerned with the relationship between physical stimuli and the effects they produce in the mind ˌpsychoˈphysical adjpsy•cho•phys•ics (ˌsaɪ koʊˈfɪz ɪks)
n. (used with a sing. v.) the branch of psychology that deals with the relationships between physical stimuli and resulting sensations and mental states. [1875–80; < German Psychophysik. See psycho-, physics] psy`cho•phys′i•cal (-ɪ kəl) adj. psychophysicsthe branch of psychology that studies the relationships between physical stimuli and resulting sensations and mental states. — psychophysicist, n. — psychophysie, psychophysical, adj.See also: PsychologyThesaurus| Noun | 1. | psychophysics - the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effectsjnd, just-noticeable difference - (psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetectedFechner's law, Weber-Fechner law - (psychophysics) the concept that the magnitude of a subjective sensation increases proportional to the logarithm of the stimulus intensity; based on early work by E. H. Weberpower law, Stevens' law, Stevens' power law - (psychophysics) the concept that the magnitude of a subjective sensation increases proportional to a power of the stimulus intensityWeber's law - (psychophysics) the concept that a just-noticeable difference in a stimulus is proportional to the magnitude of the original stimulus; "Weber's law explains why you don't notice your headlights are on in the daytime"experimental psychology, psychonomics - the branch of psychology that uses experimental methods to study psychological issues |
Translations
Psychophysics
psychophysics[¦sī·kō′fiz·iks] (psychology) The study of mental processes by physical methods. The study of the relations of stimuli to the sensations they produce. Psychophysics a psychological discipline that studies the quantitative relations between the physical characteristics of a stimulus and the intensity of the sensation evoked by the stimulus. Psychophysics deals with two main groups of problems: measurement of the stimulus threshold, that is, the sensitivity limit of the human sensory system, and the construction of psychophysical scales. The first group of problems arose as a result of measurements of the intensity of sensation made in the 19th century by the German scientists W. E. Weber and G. Fechner; these measurements involved indirect scaling, in which the intensity of sensation is a mathematical function of the magnitude of the stimulus. The threshold was regarded as the point in a series of stimuli of increasing intensity that divides the series into two parts, one that causes sensation and one that does not. Modern psychophysics—or rather its applied branch, the theory of detecting signals against a background of noise—regards the threshold as a “threshold zone,” within which the probability of a response varies between 0 and 1. Dynamic sensitivity theories deny that a sensory threshold exists as an independent reality. The second group of problems arose in connection with the use by the American scientist S. Stevens of direct scaling. In direct scaling, the magnitude of sensation—a point on the sensory scale—is determined by the subject’s own indication of the distance or relation between the intensities of stimuli in arbitrary units. Research on both groups of problems is concerned with the main theoretical problem of psychophysics, namely, the structure and metrics of the psychophysical stimulus space of sensations, which is understood as a multivector, noneuclidean space. REFERENCESKravkov, S. V. Ocherk obshchei psikhofiziologii organov chuvstv. Moscow-Leningrad, 1946.
Eksperimental’naia psikhologiia, fascs. 1–2. Edited by P. Fraisse and J. Piaget. Moscow, 1966. (Translated from French.)
Problemy psikhofiziki: Sb. Moscow, 1974.
Fechner, G. T. Elemente der Psychophysik, 3rd ed., vols. 1–2. Leipzig, 1907.
Guilford, J. P. Psychometric Methods, 2nd ed. New York, 1954.V. I. MAKSIMENKO psychophysics
psychophysics [si″ko-fiz´iks] scientific study of the quantitative relations between characteristics or patterns of physical stimuli and the sensations induced by them.psy·cho·phys·ics (sī'kō-fiz'iks), The science of the relation between the physical attributes of a stimulus and the measured, quantitative attributes of the mental perception of that stimulus (for example, the relationship between changes in decibel level and the corresponding changes in the human's perception of the sound).psychophysics (sī′kō-fĭz′ĭks)n. (used with a sing. verb) The branch of psychology that deals with the relationships between physical stimuli and sensory response.
psy′cho·phys′i·cal adj.psy′cho·phys′i·cal·ly adv.psy′cho·phys′i·cist (-fĭz′ĭ-sĭst) n.psy·cho·phys·ics (sī'kō-fiz'iks) The science of the relation between the physical attributes of a stimulus and the measured, quantitative attributes of the mental perception of that stimulus. psychophysics Branch of science that deals with the relationship between the physical stimuli and the sensory response. The measurements of thresholds (e.g. visual acuity, dark adaptation) or matching of stimuli (as in the spectral luminous efficiency curve) are examples of psychophysics. See experimental optometry.psy·cho·phys·ics (sī'kō-fiz'iks) Science of relation between physical attributes of a stimulus and measured quantitative attributes of mental perception of that stimulus. psychophysics
Related to psychophysics: Weber's law, Psychophysical methodsWords related to psychophysicsnoun the branch of psychology concerned with quantitative relations between physical stimuli and their psychological effectsRelated Words- jnd
- just-noticeable difference
- Fechner's law
- Weber-Fechner law
- power law
- Stevens' law
- Stevens' power law
- Weber's law
- experimental psychology
- psychonomics
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