Results 301 to 310 of about 3,335,604 (350)

Absolute Thresholds of Human Hearing

American Industrial Hygiene Association Journal, 1967
Abstract Data obtained from high school students indicate that distributions of hearing thresholds determined by puretone audiometry are log-normal. A graphically simplified mathematical method for determining the loci of absolute thresholds of human hearing is presented.
E R, Hermann, B R, Holzman
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Development of absolute thresholds in chickens

The Journal of the Acoustical Society of America, 1985
Absolute auditory thresholds were estimated in chickens at 0 and 4 days after hatching. Momentary suppressions of the chicks’ regular peeping, following the onset of a tone, were used as indications of stimulus detection. In the first experiment a staircase procedure was used to estimate thresholds. The absolute thresholds of both ages were the same at
L, Gray, E W, Rubel
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ABSOLUTE MEASUREMENT OF THE VIBRATORY THRESHOLD

Archives of Neurology And Psychiatry, 1951
FOR MANY years the appreciation of vibration has been used in the study and diagnosis of various neurologic disorders. 1 Up to the present time both the tuning fork and electrical vibrators 2 have been used for such determinations. However, while the latter represent a vast improvement over the former, the attendant errors in both have restricted their
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Absolute Thresholds for Moving Point Sources

Journal of the Optical Society of America, 1953
The theoretical treatment of absolute and contrast thresholds for moving point sources is presented. The thresholds are tested as functions of the velocity v and observation time t on the assumption that, under all conditions for minimum perceptibility, p quanta must be effectively absorbed in the retina within τ seconds the δ minutes of arc; within τ ...
M A, BOUMAN, G, VAN DEN BRINK
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THE ABSOLUTE THRESHOLD OF ELECTRIC SHOCK

British Journal of Psychology, 1962
Thresholds for electric shock were obtained under twelve conditions. Three types of stimulus were used; constant voltage, constant current, and constant power. These, combined with three sizes of electrode, gave nine conditions in all. A further three thresholds were obtained using the three types of stimulus and the medium size electrodes, with the ...
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TEMPORAL SUMMATION AND ABSOLUTE BRIGHTNESS THRESHOLDS

British Journal of Mathematical and Statistical Psychology, 1967
Three normative models based on the Change Detector analogies of Shallice (1964) are investigated to see how well they account for the integration of input over time that occurs in absolute brightness threshold experiments. Of the three, the geometric moving average receives no support. The perceptual moment and moving average models give about equally
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Absolute Threshold for Extremely Wide Fields

Journal of the Optical Society of America, 1958
The absolute visual threshold for an area 40° by 100° visual angle at a color temperature of 2050°K was obtained for seven observers. Two conditions were used, (1) turning the light on and (2) turning the light both on and off before a judgment was made. The average threshold for the six observers in the 24–36 year age range was 2.35 log μμL.
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Performance-intensity functions at absolute and masked thresholds

The Journal of the Acoustical Society of America, 1993
In most applications of audibility and articulation theories, it is assumed that absolute thresholds and thermal noise maskers affect speech recognition performance-intensity (P-I) functions similarly. The purpose of this study was to evaluate that assumption.
G A, Studebaker, C, Gilmore, R L, Sherbecoe   +2 more
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Absolute threshold: analysis in terms of uncertainty

Journal of the Optical Society of America, 1981
Uncertainty, the inability to know or to make use of information regarding the parameters of a luminance stimulus to be detected, is herein shown by simulation to (1) steepen the frequency-of-seeing curve and (2) cause psychophysical estimates of quantum efficiency to be too low.
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Threshold Analysis for Absolute Productivity

2021
This chapter explains how an adaptation to the TI method can allow more direct comparisons across institutions through a calculation of absolute productivity. The tutorial builds from the case study used in Chaps. 4 and 5. It shows how a feature scaling technique can open the door for absolute productivity calculation and applies threshold analysis to ...
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