retina outnumber cones one hundred million skinny elongated Cone daylight

Retina outnumber cones one hundred million skinny

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retina; outnumber cones, one hundred million; skinny, elongated - Cone= daylight vision and color vision (provide sharpness & detail in bright light); most concentrated in the fovea, where you see most clearly; only six million; short/stubby - Optic Disk= blind spot, where the optic nerve leaves the eye and sends signals to the brain Pathways to the Brain - Information is re-routed in our brain - Overlap of visual fields is in optic chiasm - Left visual field sent to right side of brain, vice versa - Primary visual pathway (90%) optic nerve → Optic chiasm → Thalamus → Visual Cortex - Secondary visual pathway optic nerve→ optic chiasm→ superior colliculus → thalamus→ visual cortex
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- Feature detectors= neurons that respond selectively to specific features in more complex stimuli - Ventral stream= what pathway; what form and color an object is - Dorsal stream= at the top of the brain; where pathway (where the objects are, motion, depth) - Primary visual cortex Stimulus for Color - Additive color mixing= formation of colors by superimposing lights, putting more light in the mixture than exists in any one light by itself (i.e. tv’s/computer screens); colors are next to one another-- not on top or mixing - Subtractive color mixing= formation of colors by removing some wavelengths of light, leaving less light than was originally there (i.e. mixing paint together to make a new color); filters out light from all colors being mixed, so color reflected back now is black Color Theories - Trichromatic Color Theory= human eye has three different receptors that are sensitive to different light wavelengths (Hermann von Helmholtz) - Opponent Process Theory= color perception depends on receptors that make antagonistic responses to three pairs of colors (Ewald Hering, 1878) -
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