| 释义 |
Weber2 Physiol.|ˈveɪbə(r)|
[The name of Ernst H. Weber (1795–1878), German physiologist and anatomist.]
1. Weber's law: the observation made by Weber that the increase in a stimulus that is just noticeable is a constant proportion (the Weber fraction or Weber ratio) of the initial stimulus, for any one sense.
1872[see psychophysical a.]. 1890W. James Princ. Psychol. I. xiii. 537 So much for a general account of what Fechner calls Weber's law. 1935Brit. Jrnl. Psychol. XXVI. 226 The obvious fact that Weber's Law is disobeyed both for very high and for very low light intensities leads to the clearly apparent result that..the various greys at either end of Dr. Ostwald's scale are never even approximately equidistant. 1938Stevens & Davis Hearing iv. 149 We are not here concerned with the constancy of the Weber fraction ΔI/I, which was another of Fechner's assumptions, but only with..the ability of an added just-noticeable difference to contribute always the same increment to the total subjective effect. 1952I. J. Hirsh Measurement of Hearing vii. 194 We conclude that Weber's Law holds (for white noise) from about 20 to 100 db Sensation Level. 1970Jrnl. Gen. Psychol. LXXXII. 38 The results of the present experiment suggest that the use of contrasting St[andard] and Co[mparison] vibrotactile stimuli will result in relatively small Weber ratios.
2. Weber-Fechner law [Fechner] = Weber's law above; also, the related statement that the strength of a sensation is proportional to the logarithm of the stimulus causing it.
1891A. D. Waller Introd. Human Physiol. xv. 536 (heading) The Weber-Fechner law. 1968Passmore & Robson Compan. Med. Stud. I. xxiv. 30/2 To increase the loudness by steps that seem equal to the listener the intensity of sound must be multiplied by approximately the same factor for each step (Weber-Fechner relation). |