https://www.nature.com/articles/srep00114.pdf (Publisher version)
Okamoto, T., Ikezoe, K., Tamura, H., Watanabe, M., Aihara, K., & Fujita, I. (2011). Predicted contextual modulation varies with distance from pinwheel centers in the orientation preference map. Scientific Reports, 1: 114. doi:10.1038/srep00114.