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The flicker fusion threshold, also known as critical flicker frequency or flicker fusion rate, is the frequency at which a flickering light appears steady to the average human observer. It is a concept studied in vision science , more specifically in the psychophysics of visual perception .
Flicker perception. Binocular summation can increase the critical flicker fusion rate (CFF) which is the highest perceivable flicker rate before the image appears continuous. The CFF is increased when both eyes see the same flicker, and it is decreased when the flicker for one eye is out of phase with the other.
Psychometric tests can be variable and affected by learning effects, and participant motivation. In principle, objective neurophysiological measurements like quantitative electroencephalogram (qEEG) analysis and the critical flicker fusion frequency (CFFF) could be used to get objective measurements. [3] [7]
8: hecht s, verrijp cd. intermittent stimulation by light : iii. the relation between intensity and critical fusion frequency for different retinal locations. j gen physiol. 1933 nov 20;17(2):251-68. 9: hecht s, shlaer s, verrijp cd. intermittent stimulation by light : ii. the measurement of critical fusion frequency for the human eye.
L.A. firefighters look for hot spots as they prepare for high winds in the burn areas of the Palisades fire on Tuesday, Jan. 14. (Brian van der Brug/Los Angeles Times)
In total, authorities found "a little over 889 kilograms" of cocaine, the Grand Duchy's public prosecutor's office said. The machine had just been delivered when it was intercepted, it added.
Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.
The number of confirmed deaths in the fires climbed to at least 27 after authorities said they found remains in the two major fire zones on Wednesday.