Visual attention and objects: evidence for hierarchical coding of location. Baylis, G. C. & Driver, J. Journal of Experimental Psychology: Human Perception and Performance, 19(3):451-70, June, 1993.
abstract   bibtex   
In 5 experiments, it was found that judging the relative location of 2 contours was more difficult when they belonged to 2 objects rather than 1. This was observed even when the 1- and 2-object displays were physically identical, with perceptual set determining how many objects they were seen to contain. Such a 2-object cost is consistent with object-based views of attention and with a hierarchical scheme for position coding, whereby object parts are located relative to the position of their parent object. In further experiments, it was shown that in accord with this hierarchical scheme, the relative location of objects could disrupt judgments of the relative location of object parts, but the reverse did not occur. This was found even when the relative position of the parts could be judged more quickly than that of the objects.
@article{ Baylis_Driver93,
  author = {Baylis , G. C. and Driver, J.},
  title = {Visual attention and objects: evidence for hierarchical coding of
	location},
  journal = {Journal of Experimental Psychology: Human Perception and Performance},
  year = {1993},
  volume = {19},
  pages = {451-70},
  number = {3},
  month = {June},
  abstract = {In 5 experiments, it was found that judging the relative location
	of 2 contours was more difficult when they belonged to 2 objects
	rather than 1. This was observed even when the 1- and 2-object displays
	were physically identical, with perceptual set determining how many
	objects they were seen to contain. Such a 2-object cost is consistent
	with object-based views of attention and with a hierarchical scheme
	for position coding, whereby object parts are located relative to
	the position of their parent object. In further experiments, it was
	shown that in accord with this hierarchical scheme, the relative
	location of objects could disrupt judgments of the relative location
	of object parts, but the reverse did not occur. This was found even
	when the relative position of the parts could be judged more quickly
	than that of the objects. }
}

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