A Complex Web of Connections Goes from the Photoreceptors to the Retinal

question 30

Essay

A complex web of connections goes from the photoreceptors to the retinal ganglion cells (in- cluding amacrine cells,horizontal cells,and bipolar cells).What is gained by the visual system from all this processing,rather than simply propagating (or passing forward)the basic signal initially transmitted from each photoreceptor?

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Definitions:

Color Varies

Indicates that the color of an object or substance can change under different conditions or in different instances.

Ordinary Mole

A small, often dark, benign growth on the skin arising from nevus cells that are usually harmless.

Symmetrical

Having parts that match in size, shape, and position on both sides of a dividing line.

Ordinary Mole

A common type of benign skin growth that appears as a small, dark brown spot, caused by clusters of pigmented cells.