S cones
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  S cones

S cones

    Short wavelength sensitive cones (blue). Are most sensitive to a wavelength of approximately 419nm. (See also L Cones and M Cones).



Subzonal sperm insertion
A variation of in-vitro fertilization in which the sperm is surgically implanted into the egg.

Sudden infant death syndrome
The death, with no clear cause, of an infant between 1 and 12 months old. Putting an infant to sleep on her back has been shown to reduce the risk of SIDS.

Surrogate mother
A woman who bears a child for a couple. Usually the surrogate is artificially inseminated with the man's sperm, though in some cases an embryo is implanted in a surrogate.

Sweat test
The standard diagnostic test for cystic fibrosis, which measures the amount of salt in a person's sweat. A high level of salt indicates cystic fibrosis.

Symbiotic stage
The early, close relationship between mother and child.

S cones

The richness of hue. Indicates how much a color has been diluted by grayness.

Dim light conditions where only rods are functional.

Second-Order statistics
Captures differences in granularity and slope.

Second-Order motion mechanisms
Capture motion information from moving properties such as a moving are of flicker in which there is no difference in mean luminance between target and background.

1. The reciprocal of the minimum stimulus strength required for the stimulus to be detected reliably (1/threshold) May be related to noise and other mechanisms. 2. Physiologically measured sensitivity averaged over many stimulus/response cycles. A measure of gain. Noise free.

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