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Relation between cognitive and motor-oriented systems of visual position perception.

B Bridgeman, S Lewis, G Heit

    Journal of Experimental Psychology. Human Perception and Performance
    |November 1, 1979
    PubMed
    Summary
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    The cognitive visual system struggles to detect target displacement during saccadic eye movements. However, the motor visual system can still accurately point to targets, indicating separate visual processing pathways.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Visual Perception

    Background:

    • Saccadic eye movements are rapid, ballistic eye movements crucial for visual exploration.
    • The visual system processes information through distinct cognitive and motor pathways.
    • Understanding the interplay between these pathways during dynamic visual tasks is essential.

    Purpose of the Study:

    • To investigate the dissociation between conscious visual perception and motor control during saccadic eye movements.
    • To determine if target displacement detection failure impacts motor accuracy.
    • To explore the information processing capabilities of cognitive versus motor visual systems.

    Main Methods:

    • Participants performed a cognitive visual task involving detecting target displacement near saccade onset.

    Related Experiment Videos

  • Participants performed a motor visual task requiring pointing to target centers with an unseen pointer.
  • Performance was assessed based on detection accuracy and pointing precision.

    • Main Results:

    • Subjects frequently failed to detect target displacement occurring during saccadic eye movements.
    • Pointing accuracy to the target center remained high, irrespective of displacement detection.
    • Motor task performance was unaffected by the failure to consciously perceive stimulus displacement.

    Conclusions:

    • The cognitive visual system's ability to process spatial information is impaired during saccades.
    • The motor visual system retains accurate spatial information for guiding actions, even when conscious perception fails.
    • This dissociation highlights distinct information processing streams within the visual system during naturalistic viewing conditions.