Lecture 3

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Matthias Niemeier

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Lecture 3: Spatial Vision Short Answer Question (Sample) on info learned from last lecture - Pathway: In the retina there are 2 types of pathways 1) Lateral pathway [neurons that a play a role in this pathway in the retina] horizontal cells followed by amacrine cells 2) Vertical pathway [neurons that a play a role in this pathway in the retina] so theyve photoreceptors (rods and cones), followed by bipolar cells and the ganglion cells [then it goes out of the retina] Functions of these 2 pathways: 1) Lateral pathway: its serving for lateral inhibition Lateral inhibition increases the contrast and sharpness in visual response. This phenomenon occurs in the mammalian retina, for example. In the dark, a small light stimulus will be enhanced by the different photoreceptors (rod cells). The rods in the center of the stimulus will transduce the light signal to the brain, whereas different rods on the outside of the stimulus will send a dark signal to the brain. This contrast between the light and dark creates a sharper image. This mechanism also creates the Mach band visual effect. So thats what the visual system deals with mostly differences in luminance not really absolute levels of luminance [not much info. in that] 2) Vertical pathway: 2 functions www.notesolution.com
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