**Core Concept**
The blobs of the visual cortex are a distinctive feature of the primary visual cortex (V1), which is involved in the processing of basic visual information such as line orientation and color. The blobs are regions of high concentration of small, round neurons that are rich in cytochrome oxidase and are thought to be involved in the processing of color and movement.

**Why the Correct Answer is Right**
The blobs are associated with the processing of color and movement, and are thought to be involved in the "where" pathway of visual processing. This pathway is responsible for localizing objects in space and is mediated by the middle temporal (MT) and medial superior temporal (MST) areas of the visual cortex. The blobs are thought to be involved in the early stages of this pathway, where they help to determine the direction and speed of moving objects.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the blobs are not primarily associated with the processing of form and shape.
**Option B:** This option is incorrect because the blobs are not primarily associated with the processing of depth and distance.
**Option C:** This option is incorrect because the blobs are not primarily associated with the processing of texture and pattern.

**Clinical Pearl / High-Yield Fact**
The visual cortex is organized into a hierarchical system, with early stages processing basic visual information such as color and movement, and later stages processing more complex information such as form and shape.

**Correct Answer: D.** The blobs of the visual cortex are associated with the processing of color and movement.