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When the room is lighted there is an immediate constriction of the pupil, the light
reflex; this is bilateral, so that even if only one eye is exposed to the light both
pupils contract to nearly the same extent. After a time the pupils expand even ...
old stimulus is the light energy required to stimulate the cones; during the first five
or more minutes the threshold of the cones decreases; i.e., they become more
sensitive. The rods then increase their sensitivity to the point that they are the ...
A coloured stimulus—e.g., a yellow light—would stimulate the red and green
receptors, but would have little effect on the blue; the combined sensation would
be that of yellow, which would be matched by stimulating the eye with red and
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review