Compare the anatomy and function of the dorsal and ventral ...

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Compare the anatomy and function of the dorsal and ventral streams.
 
  What will be an ideal response?

Question 2

Explain the organization of neurons into modules in the striate cortex. Specify which neurons respond to color, orientation, spatial frequency, movement, and retinal disparity.
 
  What will be an ideal response?

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Answer to Question 1

Answer: Visual information from primary visual is passed through a series of extrastriate cortex regions that modulate and integrate the information. From area V2, some signals ascend in a dorsal stream to visual association parietal cortex. The dorsal stream is involved in the analysis of spatial location. Other signals diverge from area V2 in a ventral stream that reaches the inferior temporal cortex. The ventral stream is involved in the perception of form.

Answer to Question 2

Answer: The striate cortex is organized into about 2500 modules, each containing about 150,000 neurons. Each module has two segments that surround a central regiontermed a blobthat contains cells that stain positively for cytochrome oxidase. Cells within the blob receive information about color and low spatial frequencies. Cells outside the blob are sensitive to different orientations, movement, spatial frequency, and texture, but not color. Each neuron in the module receives information from the same region of the visual field.