Results 281 to 290 of about 439,030 (331)

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.
Bruce R. Holzman, Edward R. Hermann
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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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Human binocular summation at absolute threshold

Vision Research, 1974
Abstract Psychophysical data are presented which indicate that the neural inputs of two stimuli presented simultaneously to corresponding retinal areas summate physiologically to lower the binocular absolute threshold. This binocular summation is not present when the stimuli are separated by more than 100 msec or are delivered to noncorresponding ...
Frank Thorn, Robert M. Boynton
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Behavioral estimates of absolute threshold in rat

Visual Neuroscience, 1994
AbstractDark-adapted thresholds of albino and pigmented rats were estimated using behavioral methods. Albino and pigmented rats who had been water deprived learned to bar press for water reinforcement when a light stimulus was presented. Absolute threshold was defined to be the light intensity at which bar pressing behavior was significantly modified ...
Pilar Herreros de Tejada, Carmen Musioz Tedo, Daniel G. Green   +2 more
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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 ...
G. van den Brink, Maarten A. Bouman
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Retinal Noise and Absolute Threshold

Journal of the Optical Society of America, 1956
It is shown that the absorption of one quantum can excite a rod in the human retina, but that at least two, and probably many more, excited rods are needed to give a sensation of light. It is suggested that noise in the optic pathway limits its sensitivity, and this idea is subjected to an experimental test.
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Screening Talent: Absolute or Percentile Thresholds?

SSRN Electronic Journal, 2020
Matching talents to tasks is an important part of job design. Organizations routinely use performance thresholds to group agents by talent. We see thresholds defined both in terms of an individual's own performance (absolute value) and in terms of peer performance (percentiles).
Shiva Sivaramakrishnan, Haijin Lin, Ramji Balakrishnan   +2 more
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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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Absolute Threshold and Frequency-of-Seeing Curves

Journal of the Optical Society of America, 1955
The simplest interpretation of the uncertainty of seeing observed at the absolute threshold is based on the theory of quantum fluctuations and assumes that in any given trial the light is seen when the retina has been acted upon by at least n quanta. When this assumption is true the frequency-of-seeing curve is a simple Poisson sum of parameter n, and ...
M. H. Pirenne, F. H. C. Marriott
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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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