internal fixation includes the use of pins, screws, staples, rods, and plates that are inserted into the bone to maintain alignment. when the fractured bone is in good alignment so that no manipulation is necessary, internal fixation may be used to stabilize the bone without any fracture reduction being performed.
What you see is only what you see. May 22, 2015. Color perception is an ancient and active philosophical problem. Itâs an instance of the wider category of sensory perception, but since the color spectrum fits on a single line (unlike, say, touch and taste), it has always been of particular interest.
In human vision, a significant degree of image processing takes place in the brain, but the retina itself also is involved in a wide range of processing tasks. In another aspect of human vision known as color invariance, the color or gray value of an object does not appear to change over a wide range of luminance. In 1672, Sir Isaac Newton demonstrated color invariance in human visual sensation and provided clues for the classical theory of color perception and the nervous system.