lateralinhibition - Zach Nuffer TA: Rohmann 1. a) Regions...

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Zach Nuffer TA: Rohmann 1. a) Regions of the retina with larger receptive fields detect the intersections seen with peripheral vision. Because of this, the edges of the black squares are included in the receptive field, and at the intersections there is more white area than on the lines between intersections, where the top and bottom of the field are completely filled by black square. This means that in an on-center off-surround receptive field, more of the surround is stimulated at the intersections than along the lines, and thus the greater stimulation of the surround produces a greater inhibition of the center receptors (via horizontal cells), and so there is less hyperpolarization, leading to fewer action potentials from the ganglion cell. Once again, this is because there is more lateral inhibition at the intersection, due to greater surround stimulation. b) When looking directly at a particular intersection, the light reflected from that intersection stimulates the fovea, where the receptive fields are the smallest on the retina. Therefore, a receptive field at the fovea is small enough to completely
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This note was uploaded on 02/25/2009 for the course BIO 2220 taught by Professor Hopkins,c.d. during the Spring '08 term at Cornell University (Engineering School).

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lateralinhibition - Zach Nuffer TA: Rohmann 1. a) Regions...

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