The human visual system is optimised for discriminating the spatial structure of scenes with natural second-order statistics

@InProceedings\{PTT1998,
  author       = "C. Alejandro Parraga and D.J. Tolhurst and Tom Troscianko",
  title        = "The human visual system is optimised for discriminating the spatial structure of scenes with natural second-order statistics",
  booktitle    = "Journal of Physiology",
  volume       = "512",
  pages        = "102P",
  year         = "1998",
  url          = "http://www.cat.uab.cat/Public/Publications/1998/PTT1998"
}