10: Examples of neurons that high-low frequency detectors contribute to: (1) mixed3b 345 (a boundary detector), (2) mixed3b 276 (a center-surround texture detector), (3) mixed3b 314 (a double boundary detector), and (4) mixed3b 365 (an hourglass shape detector). Whereas activation from a high-low frequency detector can help detect boundaries between different objects, inhibition from a high-low frequency detector can also add structure to an object detector by detecting regions that must be contiguous along some direction — essentially, indicating the absence of a boundary.