High-Density Recording Reveals Sparse Clusters (But Not Columns) for Shape and Texture Encoding in Macaque V4

We used high-density Neuropixels probes in two awake monkeys (one female and one male) to characterize the shape and texture tuning of dozens of neurons simultaneously. The shape set included 15 simple geometric shapes each presented at eight different rotations in 45° increments, resulting in a total of 120 shape stimuli. Shapes were filled with a uniform color, either darker or brighter than...