PSYA01H3 Chapter Notes - Chapter 3: Lateral Geniculate Nucleus, Visual Acuity, Visual Cortex

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Psyb51 chapter 3: spatial vision: from spots to stripes (jan 24th, 2014) Iris regulates amount of light entering eyeball: cornea, lens, humors focus rays so that clear image is formed on retina, camera take pictures. Postreceptor layers of retina translate raw light captured by photoreceptors into patterns of spots surrounded by darkness or vice versa, detected by ganglion cells. Retinal translation helps us perceive pattern of light and dark areas in visual field, regardless of overall light level: neurons in cerebral cortex prefer lines, edges and stripes. This portion of visual cortex organized into ting computers responsible for det orientation, width, colour and other characteristics of stripes in 1 small portion of visual field. Eye doctors specify acuity in terms like 20/20. Vision scientists talk about the smallest visual angle of a cycle of grating that we can perceive fig. Cycle one"s repetition of a black and white stripe (both gratings in fig 3. 2 have.

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