GENERAL HISTOLOGY

Detailed explanation-1: -Blobs are areas within V1 sensitive to color, whereas interblobs are areas sensitive to the orientation of an object. The interblob cells respond as the simple cells that we have described above. The blobs show color responses, and the layer 4B respond well to moving stimuli and stimuli of very low contrast.

Detailed explanation-2: -There are two distinct classes of cells in the primary visual cortex (V1): simple cells and complex cells. One defining feature of complex cells is their spatial phase invariance; they respond strongly to oriented grating stimuli with a preferred orientation but with a wide range of spatial phases.

Detailed explanation-3: -Staining for the mitochondrial enzyme cytochrome oxidase reveals an array of dense regions (blobs) in the primate primary visual cortex. They are most obvious in the upper layers, 2 and 3, but can also be seen in layers 4B, 5, and 6, in register with the blobs in layers 2 and 3.