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Overt and covert object-based attention.

Jason S McCarley1, Arthur F Kramer, Matthew S Peterson

  • 1University of Illinois at Urbana-Champaign, Urbana, Illinois, USA. jmccarley@psychology.msstate.edu

Psychonomic Bulletin & Review
|March 5, 2003
PubMed
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Object-based representations guide eye movements and attention. Eye movements were more likely to stay within a cued object, demonstrating object-based attentional effects during visual search.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Perceptual object representations play a crucial role in guiding attention and eye movements.
  • The object-cuing paradigm has been instrumental in studying attentional allocation.

Purpose of the Study:

  • To investigate how perceptual object representations influence the control of eye movements and attention.
  • To adapt the object-cuing paradigm to necessitate overt eye movements.

Main Methods:

  • Utilized a gaze-contingent display to enforce overt scanning of visual stimuli.
  • Adapted the Egly, Driver, and Rafal (1994) object-cuing paradigm for experiments requiring eye movements.
  • Presented pairs of adjacent rectangles, each with two characters, and cued target locations prior to stimulus onset.

Related Experiment Videos

Main Results:

  • Observed object-based effects in eye movements, with saccades more frequently occurring within the cued rectangle after invalid cues.
  • Found shorter dwell times preceding saccades within the cued rectangle compared to those between rectangles.
  • No facilitation of extrafoveal stimulus processing within the cued object was detected, suggesting limited covert attention allocation.

Conclusions:

  • Eye movements are guided by object-based representations, influencing spatial attention.
  • Object-based effects on saccade generation and dwell times indicate a role for perceptual objects in motor control.
  • Covert attention may not be allocated more densely within cued objects, despite object-based effects on eye movements.