Results 261 to 270 of about 3,580,404 (289)
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Visual Contrast Mapping based on Weber's Fraction
Color and Imaging Conference, 2006Hiroaki Kotera +4 more
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Fractional Sturm–Liouville problems for Weber fractional derivatives
International Journal of Computer Mathematics, 2018In this paper, we introduce the regular and singular fractional Sturm–Liouville problem (SLP) Dαp(x)Dαy+q(x)y(x)=λωα(x)y(x ...
Mohammad Hossein Derakhshan +1 more
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Obtaining equal loudness contours from Weber fractions
The Journal of the Acoustical Society of America, 1995An empirical equation from Riesz’s classic study on difference thresholds is treated in a new manner. Reformulating the expression for the Weber fraction allows one to account for the shape of the loudness function at different frequencies. Furthermore, the emerging loudness function unifies both the commonly used power and logarithmic laws of ...
Willy Wong, Kenneth H. Norwich
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Deriving the Weber fraction from loudness functions.
The Journal of the Acoustical Society of America, 1996In a previous paper [W. S. Hellman and R. P. Hellman, J. Acoust. Soc. Am. 91, 2380(A) (1992)], Weber fractions for intensity discrimination were derived from their concomitant pure tone loudness functions in normal hearing. The calculational procedure employed a generalized McGill–Goldberg model. This work extends these findings to more frequencies, to
William S. Hellman, Rhona P. Hellman
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Psychology Review, 2019
Contingency is a critical concept for theories of associative learning and the assignment of credit problem in reinforcement learning. Measuring and manipulating it has, however, been problematic.
C. R. Gallistel +2 more
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Contingency is a critical concept for theories of associative learning and the assignment of credit problem in reinforcement learning. Measuring and manipulating it has, however, been problematic.
C. R. Gallistel +2 more
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Weber Fraction Analogues in Social Perception: Further Investigation—Reply to a Comment
Perceptual and Motor Skills, 1963The following points are in reply to Levy's comment (1962) on our recent note (Braun 8r Haven, 1962 ). First, we wish to make it clear thac we regard [he Levy work as a mosc ingenious and provocative atcernpt to apply the model of psychophysics to the field of social psychology.
G A, HAVEN, J R, BRAUN
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WEBER FRACTION ANALOGUES IN SOCIAL PERCEPTION: FURTHER INVESTIGATION—A COMMENT
Perceptual and Motor Skills, 1962In the interests of clarification, I should like to point out chat Braun and Haven ( 1962), in reporting a significant difference in AM/M over different vaIues of M, present evidence bearing upon only one of the two criteria which I suggest (1760) for the existence of a Weber Fraction Analogue (WFA) in social perception.
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Background-Adjusted Weber-Fechner Fraction Considering Crispening Effect
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2005The recognition limit of luminance difference in the human visual system (HVS) has not been studied systematically. In this paper, surround adapted Weber-Fechner fraction is calculated based on the crispening effect. It is found that surround adapted fractions have reduced to 1/3 of the traditional Weber-Fechner fractions. As compared with Breitmeyer's
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Journal of American Association for Pediatric Ophthalmology and Strabismus, 2013
Sturge-Weber syndrome is a nonhereditary congenital neurocutaneous syndrome characterized by leptomeningeal angiomatosis, facial nevus flammeus, and diffuse choroidal hemangioma, which when complicated by total retinal detachment, portend a poor prognosis. Management is often limited to salvage external beam irradiation.
Yoshihiro, Yonekawa +3 more
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Sturge-Weber syndrome is a nonhereditary congenital neurocutaneous syndrome characterized by leptomeningeal angiomatosis, facial nevus flammeus, and diffuse choroidal hemangioma, which when complicated by total retinal detachment, portend a poor prognosis. Management is often limited to salvage external beam irradiation.
Yoshihiro, Yonekawa +3 more
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Where the action is: Weber fractions as a function of sound pressure at low frequencies
The Journal of the Acoustical Society of America, 1993Weber fractions for sound intensity were measured for 70-, 100-, 200-, 1000-, and 10 000-Hz tone pulses at sound-pressure levels (SPLs) ranging from just above individual listeners’ absolute thresholds to near their highest tolerable SPLs, using a two-alternative forced-choice adaptive staircase technique governed by a 1-up, 3-down rule.
L M, Ward, K P, Davidson
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