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Visual Lecture - PSY 230 Lecture 3/5 Visual System...

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PSY 230 Lecture 3/5 Visual System - Information hits eye backwards and inverted - Blood vessels and optic nerve come in through optic disk, no retina located in that area - Retina contains light sensitive cells - Blind spot caused by lack of retina in optic disk. Brain typically fills in blind spot *Draw visual pathway from outside the eye to V1* 3 Characteristics of light - Brightness - Hue (red, green, blue, violet..) - Saturation (intensity of light color) Characteristics not judged in isolation, but in contrast with surroundings - Retina responds to contrast - Allows us to see lines of contrast, and see objects in space (to distinguish between things) - Axons of the ganglion cells become the optic nerve - Light passes through optic nerve fibers, ganglion cell, and bipolar cell layer, before hitting area sensitive to light (rods and cones) Hyperpolarization of photoreceptors - Cones ( Photopic)- Much less, lower sensitivity. Used for day vision. - Rods ( Scotopic) - Much more rods than cones. Rods very sensitive to light. Used for night vision. Cannot see color at night. Has lower acuity. - Fovea (cones), tiny area in eye, most sensitive to light. Less sensitive than rods, but much higher acuity. Area where highest sensitivity cones are found.
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