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What controls attention in natural environments
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@Article{Shinoda:01,
  author = 	 {Hiroyuki Shinoda and Mary M. Hayhoe and Anurag Shrivastava},
  title = 	 {What controls attention in natural environments},
  journal = 	 {Vision Research},
  year = 	 {2001},
  number = 	 {41},
  pages = 	 {3535 - 3546},
  abstract =     {The highly task-specific fixation patterns 
revealed in performance of natural tasks demonstrate the   
fundamentally active nature of vision, and suggest that in 
many situations, top-down processes may be a major  
factor in the acquisition of visual information.  
Understanding how a top-down visual system could  
function requires understanding the mechanisms that 
control the initiation of the different task-specific
computations at the appropriate time. This is particularly 
difficult in dynamic environments, like driving, where  
many aspects of the visual input may be unpredictable.  
We therefore examined drivers' ability to detect Stop  
signs in a virtual environment when the signs were visible
for restricted periods of time. Detection performance is 
heavily modulated both by the instructions and the local  
visual context. This suggests that visibility of the signs 
requires active search, and that the frequency of this  
search is influenced by learnt knowledge of the  
probabilistic structure of the environment.    }
}