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Emergent features, attention, and object perception.

A Treisman, R Paterson

    Journal of Experimental Psychology. Human Perception and Performance
    |February 1, 1984
    PubMed
    Summary
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    Perceptual processing reveals shapes are analyzed into parts before attention, enabling illusory conjunctions. Emergent features, like closure, influence how we perceive complex shapes such as triangles and arrows.

    Area of Science:

    • Cognitive Psychology
    • Visual Perception
    • Computational Neuroscience

    Background:

    • Understanding how the human visual system processes complex shapes is crucial for cognitive science.
    • Previous research suggests that visual perception involves both preattentive and attentive processing stages.
    • The role of 'emergent features' in shape perception remains an area of active investigation.

    Purpose of the Study:

    • To investigate the preattentive processing of geometric shapes like arrows and triangles.
    • To determine if shapes are decomposed into component parts before conscious awareness.
    • To explore the contribution of emergent features to shape recognition and visual search.

    Main Methods:

    • Subjects performed various perceptual tasks involving arrows, triangles, and their constituent lines and angles.

    Related Experiment Videos

  • Illusory conjunctions were analyzed under conditions of divided attention.
  • Performance correlations across tasks and subjects were examined to infer emergent features.

    • Main Results:

    • Evidence suggests preattentive analysis of shapes into simpler components, which can lead to illusory conjunctions when attention is divided.
    • Emergent features, such as closure (for triangles) and arrow junctions, were inferred from subject performance.
    • These emergent features appear to mediate parallel processing in visual search and texture segregation for some subjects.

    Conclusions:

    • Shape perception likely involves the preattentive extraction of features that are not present in the individual components.
    • The perception of triangles and arrows is not purely holistic but relies on emergent properties.
    • Individual differences exist in the utilization of emergent features, such as closure, for shape formation.