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Does global precedence really depend on visual angle?

D Navon, J Norman

    Journal of Experimental Psychology. Human Perception and Performance
    |December 1, 1983
    PubMed
    Summary
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    Global advantage in visual processing is not limited by visual angle. This study demonstrates global advantage across small and large visual angles, challenging previous findings and suggesting relative size as a key factor.

    Area of Science:

    • Visual perception
    • Cognitive psychology
    • Experimental psychology

    Background:

    • Previous research suggests global advantage is limited to stimuli within 7-10 degrees of visual angle.
    • This limitation may stem from a confound between globality and eccentricity in prior studies.

    Purpose of the Study:

    • To investigate global advantage in visual processing across different visual angles.
    • To determine if globality and eccentricity were confounded in previous research.
    • To explore the role of relative size in global advantage.

    Main Methods:

    • Utilized stimuli with elements on their perimeter (Cs, circles) in small (2 degrees) and large (17.25 degrees) visual angle conditions.
    • Experiment 1: Participants identified the orientation of global shapes or local elements.

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  • Experiment 2: Assessed interference between global and local processing levels.

    • Main Results:

    • Global advantage was observed in both small and large visual angle conditions, contradicting prior findings.
    • Relative size appeared to be a significant determinant of global advantage.
    • In small visual angles, global processing interfered with local processing; this interference was smaller and symmetrical in large visual angles.

    Conclusions:

    • Global advantage in visual perception is not restricted by visual angle.
    • Relative size plays a crucial role in achieving global advantage.
    • Processing time and interference effects suggest distinct stages for relevant information processing and distractor effectiveness.