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Attentional requirements in a ‘preattentive’ feature search task

Author

Listed:
  • Julian S. Joseph

    (University of Nevada
    Correspondence and requests for materials should be addressed to J.S.J.)

  • Marvin M. Chun

    (Yale University)

  • Ken Nakayama

    (Harvard University)

Abstract

It is commonly assumed that certain features are so elementary to the visual system that they require no attentional resources to be perceived. Such ‘preattentive’ features are traditionally identified by visual search performance1,2,3, in which the reaction time for detecting a feature difference against a set of distractor items does not increase with the number of distractors. This suggests an unlimited capacity for the perception of such features. We provide evidence to the contrary, demonstrating that detection of differences in a simple feature such as orientation is severely impaired by additionally imposing an attentionally demanding rapid serial visual presentation task involving letter identification. The same visual stimuli exhibit non-increasing reaction time versus set-size functions. These results demonstrate that attention can be critical even for the detection of so-called ‘preattentive’ features.

Suggested Citation

  • Julian S. Joseph & Marvin M. Chun & Ken Nakayama, 1997. "Attentional requirements in a ‘preattentive’ feature search task," Nature, Nature, vol. 387(6635), pages 805-807, June.
    • Handle: RePEc:nat:nature:v:387:y:1997:i:6635:d:10.1038_42940
    DOI: 10.1038/42940
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