Final answer:
The parvocellular pathway in the visual system involves varying receptive field sizes. Correct option is 4.
Step-by-step explanation:
The pathway in the visual system that best corresponds to option 2) varying receptive field sizes is the parvocellular (small cell) pathway. This pathway carries information on color and fine detail, and the ganglion cells that make up this pathway have smaller receptive fields compared to the magnocellular (big cell) pathway.
For example, when you focus on the details and colors of an object, such as the fine lines and different shades of color in a painting, you are primarily utilizing the parvocellular pathway.Therefore, moving from V1 along the parvocellular pathway involves processing visual information with varying receptive field sizes.