Thus time perception is like the perception of lights, sounds, and other sensory events, where accuracy also is relative to the size ( brightness, loudness, etc . ) of the percept being judged . ( See Weber-Fechner law .)
22.
However, CRI is a poor indicator of the perception of light produced by LEDs, and scores as low as 25 can produce vivid-appearing white light, while high-scoring sources can still be very poor at rendering reds, including skin tones.
23.
Illuminance was formerly often called brightness, but this leads to confusion with other uses of the word, such as to mean luminance . " Brightness " should never be used for quantitative description, but only for nonquantitative references to physiological sensations and perceptions of light.
24.
Czeisler, an endocrinologist and specialist in sleep disorders and circadian rhythms at Harvard Medical School and Brigham and Women's Hospital, said that some blind people are able to remain synchronized to an ordinary 24-hour day even though they have no conscious perception of light.
25.
Frederick Hartt in his " History of Italian Renaissance Art " wrote that Titian " was the first man in modern times to free the brush from the task of exact descriptionand to convert it into a vehicle for the direct perception of light through color, and the unimpeded expression of feeling ."
26.
In optics, Ibn Sina was among those who argued that light had a speed, observing that " if the perception of light is due to the emission of some sort of particles by a luminous source, the speed of light must be finite . " He also provided a wrong explanation of the rainbow phenomenon.
27.
In his finest pictures the disposition of every element, of each line and shape, is elevated to an expressive intensity few photographers managed to attain . . . White was able to transform the sensory perception of light into an exposition of the most fundamental aspect of photography-the literal materialization of form through light itself.
28.
Two of James Turrell's disquieting room installations dealing with the perception of light are among the permanent exhibits, as is Jene Highstein's " Bed-Sitting Rooms for Artist in Residence, " in which two beds slide back and forth between slots in the wall, depending on the number of occupants in a room.
29.
To overcome regional and cultural isolation she engaged after World War Two until the 1990s in extended travelling in the Mediterranean Basin and Europe, Africa, Central America and China with repeated and prolonged stays in the US . These travels were important sources of inspiration and have influenced her perception of light and space, which are central elements of her art.
30.
Head and Rivers had discovered two constituents of cutaneous sensibility : the " protopathic " system, through which pain and degrees of heat and cold beyond normal thresholds can be recognised but not accurately localised, and an " epicritic " system which is concerned with the perception of light touches, degrees of temperature natural to the skin, accurate localisation of stimulus and discrimination of two simultaneous contacts.
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