They have the same restrictions for becoming excited that simple cells have except they are not very restrictive to the precise area of the retina that the bar of light stimulates. They may be just as sensitive to the width and length of bar, but that bar can occur over a wider area of the retina. Simple cells of the same orientation are arranged in columns. Laterally in one direction are cells with input from nearby retina, laterally the other dimension are cells of progressively more light angle. Input from left and right eye are in adjacent columns.
Color interpretting cells are in between columns.
The occipital cortex has at least three and probably more representations of the visual field in neural cell spatial arrangements. This is the fastest and simplest reflex in the body being composed of only two nerves and one synapse. It is the reflex from muscle stretch receptors to alpha motor neurons and the knee jerk response is a good example of it. When a hammer tightens the tendon below the knee the stretch is detected by a 1a sensory nerve cell, carried to the spinal cord in the dorsal root and connects directly to several a-motoneurons serving the same muscle. This stimulates these cells to fire and cause a contraction of the muscle thus relieving the stretch on the receptor.