EYE BRAIN AND VISION - PART 5 pptx

... possible patterns are a checker-board, stripes, and islands in an ocean. In this case, the surface is the cortex, and the regions are left -eye and right -eye. 14 locally and help to distribute the ... 4 feeds the layers above and below mainly by up -and- down connections, the regions of eye preference in three dimensions are a series of alternating left- and right -eye...

Ngày tải lên: 09/08/2014, 20:22

... about the region of brain called the motor cortex and have a rough idea of its function: it subserves voluntary movement; destroy it on one side and the hand and face and leg on the opposite ... heart end of this continuum. The visual cortex is perhaps the best-understood part of the brain today and is certainly the best-known part of the cerebral cortex. We know reasonab...

Ngày tải lên: 09/08/2014, 20:22

... turned off. If you look at the left black -and- white square on this page with the left eye and the right one with the right eye, by crossing or uncrossing your eyes or with a stereoscope, you might ... obviously monocular, and geniculate cells, because of the left -eye, right -eye layering, are for all intents and purposes monocular: they respond to stimulation of either one ey...

Ngày tải lên: 09/08/2014, 20:22

... red-green, yellow-blue, and black-white, was regarded in his time and for the next half-century as rivaling and contradicting the Young-Helmholtz three-pigment (red, green, and blue) theory: ... monochromatic lights whose wavelengths are 430, 53 0, and 56 0 nanometers are not blue, green, and red but violet, blue-green, and yellow-green; and (3) if we were to stimulate c...

Ngày tải lên: 09/08/2014, 20:22

... to and branch in separate left -eye and right -eye regions. They first send branches everywhere over a radius of a few millimeters, and only later, around the time of birth, do they retract and ... synapse with C, and the A-to-C synapse is weak and the B-to-C synapse is strong; suppose further that A and B fire at about the same time or that B fires just slightly ahead of...

Ngày tải lên: 09/08/2014, 20:22

... transparent front part of the eye) and lens together form the equivalent of the camera lens. About two-thirds of the bending of light neces- sary for focusing takes place at the air-cornea interface, ... the fovea and far periphery, where rods are more numerous than cones. From top to bottom is about one-quarter millimeter. 5 looking at something and pressing on the side of o...

Ngày tải lên: 09/08/2014, 20:22

... (Remember that the visual environment is inverted and reversed on the retina by the optics of the eye. ) The big difference between one-eyed and two-eyed vision is in the sense of depth, a subject ... an equal number of left -eye and right -eye cells, at least in parts of the cortex subserving vision up to about 20 degrees from the direction of gaze. Beyond this center-surrou...

Ngày tải lên: 09/08/2014, 20:22

... orientations and then come back to the first, and cycle around again, instead of packing together all cells with 30-degree orientation, all cells with 42-degree orientation, and indeed all left -eye ... early, and the number of examples are still too few, to allow an interpretation of the patterns in terms of fractures and reversals, but the method is promising. 24 ocean -...

Ngày tải lên: 09/08/2014, 20:22

... lengths, from 8 .5 mm (wide-angle lens), through the midrange, 25 50 mm, to 1 35 mm (telelens). In general, wide-angle objectives (8 .5 12 .5 mm) have high off-axis aberrations and should be used ... phase-alternating line (PAL) system is used, and each frame has 6 25 lines and is scanned 25 times each second. We classify under this heading a number of specialized high-resolutio...

Ngày tải lên: 10/08/2014, 02:21