The influence of cast shadows on visual search.

@article{Rensink2004TheIO,
  title={The influence of cast shadows on visual search.},
  author={Ronald A. Rensink and Patrick Cavanagh},
  journal={Perception},
  year={2004},
  volume={33 11},
  pages={
          1339-58
        }
}
We show that cast shadows can have a significant influence on the speed of visual search. In particular, we find that search based on the shape of a region is affected when the region is darker than the background and corresponds to a shadow formed by lighting from above. Results support the proposal that an early-level system rapidly identifies regions as shadows and then discounts them, making their shapes more difficult to access. Several constraints used by this system are mapped out… CONTINUE READING

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