PSY100H1 Chapter Notes - Chapter 4.2: Wave Height, Retina, Far-Sightedness
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PSY100H1 Full Course Notes
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Document Summary
Eye gathers info to change into action potential. Light travels in waves that vary in 2 properties: Characteristics of light experienced as hue, intensity, & saturation. When light reaches back of eye, it stimulates receptors which convert light into messages that brain interprets. Retina: absorbs light & sends signals related to light properties to brain. Photoreceptors: light is transformed into neural signals. Photoreceptor info sent to ganglion cells which send info to the optic nerve. Nerve creates area with no photoreceptors, resulting in a blind spot. The retina: from light to nerve impulse. Rods: occupy peripheral regions & are sensitive under low light. Cones: sensitive to diff. wavelengths of light perceived as colour. Rods have a 10:1 ratio w/ ganglion cells, while cones are 1:1. Explains why colourful stimuli appear sharper than shadowy, grey images. Dark adaptation: rods & cones become sensitive to light under low illumination.
