Bottom-up and top-down attention are independent. Pinto, Y., van der Leij, A. R, Sligte, I. G, Lamme, V. A., & Scholte, H S. Journal of vision, 13(3):16–16, The Association for Research in Vision and Ophthalmology, 2013.
bibtex   
@article{pinto2013bottom,
  title={Bottom-up and top-down attention are independent},
  author={Pinto, Yair and van der Leij, Andries R and Sligte, Ilja G and Lamme, Victor AF and Scholte, H Steven},
  journal={Journal of vision},
  volume={13},
  number={3},
  pages={16--16},
  year={2013},
  publisher={The Association for Research in Vision and Ophthalmology}
}

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