Results 91 to 100 of about 906,260 (140)

Effects of Fasting on Visual Flicker Fusion

Perceptual and Motor Skills, 1989
Two experiments are reported which investigated the effects of fasting on visual flicker fusion (VFF). In Exp. 1 the VFF of 40 undergraduate students, 20 men and 20 women, whose mean age was 22.5 yr., was measured in nonfasting conditions 1 to 2 weeks before and in fasting conditions during the Muslim fasting month of Ramadan. In Exp.
M R, Ali, T, Amir
openaire   +2 more sources

Critical flicker fusion in Siamese cats

Experimental Brain Research, 1981
Critical flicker fusion was determined over a wide luminance range for six Siamese and four normal cats. The Siamese cats had the lowest CFF at all luminance levels when compared to normal and binocularly deprived (BD) cats. The Siamese cat's inferior temporal resolution is most likely due to their profound y-cell loss because (1) CFF is proportional ...
M S, Loop, T J, Frey
openaire   +2 more sources

Flicker Fusion Fields

American Journal of Ophthalmology, 1950
MANY attempts have been made in the past to alter the usual technic of taking visual fields in an effort to detect the earliest changes due to glaucoma. Some have reduced the illumination (Bair,11940; Marlow,21947; Mann and Sharpley,31947). Others (Derby, Waite and Kirk,41926; Derby, Chandler and O'Brien,51928) found that the light threshold and the ...
openaire   +3 more sources

Flicker Fusion Thresholds in Multiple Sclerosis

Archives of Neurology And Psychiatry, 1957
Problem The visual flicker-fusion threshold (FFT)* has been reported to be lower in patients with brain damage than in persons free from such pathology.1-6Most of these studies have been concerned with the effects of damage to the gray matter of the brain, especially to the frontal and occipital lobes, and the relationship of this damage to FFT.
P N, MILLER, O A, PARSONS
openaire   +2 more sources

Flicker fusion frequency in sauna-bath

Internationale Zeitschrift f�r Angewandte Physiologie Einschliesslich Arbeitsphysiologie, 1955
In 20 experiments on 10 young adult male subjects the FFF was determined in connection with an exposure to high ambient temperatures in the Finnish sauna-bath. The FFF initially fell, but rose gradually back to the pre-sauna level during a 15 min. stay in the hot room. Cooling after the exposure did not cause any further changes. The FFF behaved in the
R, KAARIAINEN, M J, KARVONEN, M, KINNUNEN   +2 more
openaire   +2 more sources

TESTING VISUAL FIELDS BY FLICKER FUSION

Archives of Neurology And Psychiatry, 1951
THE CRITICAL rate at which a flickering light of decreasing frequency is first perceived to flicker is the one test of visual function in which the light-adapted eye is more sensitive at the periphery of the retina than at its center. Previous investigators have agreed that flicker fusion fields are sensitive and "typical" in neurological lesions ...
openaire   +3 more sources

Flicker between Different Brightness Levels as Determinant of the Flicker Fusion*

Journal of the Optical Society of America, 1960
For investigation of flicker produced by phasic variations of the brightness level, an electronic flicker apparatus was developed for continuous variation of brightness, area, light-dark ratio, ambient light ratio, and monocular or binocular exposure.
openaire   +2 more sources

Flicker Fusion in Pericoecal Area

1981
The pericoecal area is known to be the site of some early defects of the visual field. Flicker fusion frequencies, on turn, have been reported to be often altered when more classical Perimetric examination results are still unchanged. This work is intended to report ‘normal’ values for flicker fusion frequencies in this area based on the examination of
Giovanni Calabria, Enrico Gandolfo, Giuseppe Ciurlo, Pietro Rossi   +3 more
openaire   +1 more source

The modification of critical flicker fusion frequency by an adapting stimulus of flickering light

Vision Research, 1965
Abstract The critical flicker fusion frequency is elevated by adaptation to intermittent light of high frequency and depressed by intermittent light of lower frequency. This relationship is almost linear between adapting frequencies of 24 and 54 c/s.
openaire   +2 more sources

Flicker Fusion and Spatial Summation

1981
Flicker fusion frequencies in the central and paracentral retina were studied for liminar and supraliminar stimulations with targets of different size. Statistical analysis of the results obtained in a relatively large series of patients allows a good standardization of ‘normal’ values for healthy people.
M. Zingirian, G. Ciurlo, P. Rossi, C. Burtolo   +3 more
openaire   +1 more source