Selective looking: Attending to visually specified events. Neisser, U. & Becklen, R. Cognit. Psychol., 7(4):480 - 494, 1975.
doi  abstract   bibtex   
Subjects looked at two optically superimposed video sccreens, on which two different kinds of things were happening. In the principal condition, they were required to follow the action in one episode (by pressing keys when significant events occurred) and ignore the other. They could do this without difficulty, although both were present in the same fully overlapped visual field. Odd events in the unattended episode were rarely noticed. It was very difficult to monitor both episodes at once. Performance was no better when the two episodes were presented to different eyes (dichoptic condition) than when both were given binocularly. It is argued that selective attention does not involve special mechanisms to reject unwanted information, but is a direct consequence of skilled perceiving.
@Article{Neisser1975,
  author   = {Ulric Neisser and Robert Becklen},
  journal  = {Cognit. Psychol.},
  title    = {Selective looking: Attending to visually specified events},
  year     = {1975},
  issn     = {0010-0285},
  number   = {4},
  pages    = {480 - 494},
  volume   = {7},
  abstract = {Subjects looked at two optically superimposed video sccreens, on which
	two different kinds of things were happening. In the principal condition,
	they were required to follow the action in one episode (by pressing
	keys when significant events occurred) and ignore the other. They
	could do this without difficulty, although both were present in the
	same fully overlapped visual field. Odd events in the unattended
	episode were rarely noticed. It was very difficult to monitor both
	episodes at once. Performance was no better when the two episodes
	were presented to different eyes (dichoptic condition) than when
	both were given binocularly. It is argued that selective attention
	does not involve special mechanisms to reject unwanted information,
	but is a direct consequence of skilled perceiving.},
  doi      = {10.1016/0010-0285(75)90019-5},
}

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