Consider a simple retina in which there are two photoreceptors, Rod A and Rod B,

Question

Consider a simple retina in which there are two photoreceptors, Rod A and Rod B, connected by a single horizontal cell. Rod A projects to a bipolar cell, which in turn, projects to a ganglion cell. Assume there are excitatory connections between A and the bipolar cell, and excitatory connections between the bipolar cell and ganglion cell. For the system described answer the following questions: (a) We shine a light on Rod B while leaving Rod A in the dark. What activity will this cause in the bipolar cell described? (i) No effect (ii) Excite (i Inhibit (b) The receptive field property of the ganglion cell described above is: (1) On-center (ii) Off-center

Explanation / Answer

1. It must be noted that there are ON_OFF CELLS in bipolar cells, ganglion cells,and retina also.

2. Stimulating the ON CELL by light has an excitatory effect for that photoreceptor and by shoning the light on OFF CELLS we get INHIBITITORY effect .

3. Here by stimulating ROD B we get INHIBITITORY EFFECT as we are throwing light on Rod B which is an OFF CELL in this case.

4. So here OFF CELL is stimulated

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