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Discussion 6 key - Vision discussion section Types of...

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1) Broad-band center-surround cells. These cells receive inputs from both red and green cones, but are “color blind” and respond only to light-dark differences. G+R+ G+R+ G-R- G-R- On-center cell Off-center cell You already saw these cells in class. 2) Red-green color opponent center-surround cells These cells receive input from both red and green cones, and are somewhat selective for wavelength. Green on-center Green off-center G+ R- G+ R- R+ G- R+ G- Red on-center Red off-center Vision discussion section Types of ganglion cell (or LGN cell) receptive fields:
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Homework #4 included a question on the responses of a green on-center cell. We can now look at the responses of a green off-center cell. Central red spot Central green spot Central white spot R G Large red spot Large green spot Large white spot Green off-center R+ G- Red light excites green cone which provides inhibitory input to center of receptive field, so weak inhibition is seen.
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