@article{feifei2005dns,
  title={{Why does natural scene categorization require little attention? Exploring attentional requirements for natural and synthetic stimuli}},
  author={Fei-Fei, L. and VanRullen, R. and Koch, C. and Perona, P.},
  journal={Visual Cognition},
  volume={12},
  number={6},
  pages={893--924},
  year={2005},
  publisher={Psychology Press}
}