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Visual transparent & visual occlusion: An EEG and COP study.

Kwang Leng Goh, Susan Morris, Wee Lih Lee

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 23, 2017
    PubMed
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    Visual occlusion significantly impacts postural control and brain activity. Standing with eyes closed (visual occlusion) increased sway and altered alpha brain waves, indicating greater reliance on non-visual sensory information for balance.

    Area of Science:

    • Neuroscience
    • Biomechanics
    • Human Physiology

    Background:

    • Postural control relies on visual, vestibular, and somatosensory inputs.
    • Understanding how visual information modulates brain activity and body sway is crucial for balance research.

    Purpose of the Study:

    • To investigate the effects of visual occlusion on electroencephalography (EEG) and center of pressure (COP) during standing.
    • To determine how altered visual input influences cortical activity and postural steadiness in young adults.

    Main Methods:

    • Simultaneous recording of EEG and COP data in young adults under visual transparent (VT) and visual occlusion (VO) conditions.
    • Utilized liquid crystal spectacles to precisely control visual input.
    • Analyzed alpha, theta, and beta EEG bands, alongside time-domain and frequency-domain COP measures.

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    Main Results:

    • Significant differences in alpha band power spectrum were observed between VT and VO conditions.
    • COP analysis revealed significantly larger sway measures (mean velocity, sway area) and altered frequency domain measures in the VO condition.
    • Increased alpha power in frontal and posterior regions during VO suggested cortical processing of vision.

    Conclusions:

    • Visual occlusion significantly impairs postural steadiness and alters cortical activity patterns.
    • Alpha band EEG changes reflect the brain's adaptation to reduced visual input for maintaining balance.
    • These findings highlight the critical role of vision in maintaining upright stance and provide insights into sensorimotor control.