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Updated: Jan 20, 2026

Event-related Potentials During Target-response Tasks to Study Cognitive Processes of Upper Limb Use in Children with Unilateral Cerebral Palsy
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Alterations in Brain Structural Connectivity After Unilateral Upper-Limb Amputation.

Xiaoli Guo, Ruihao Liu, Jincheng Lu

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |August 24, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Unilateral upper-limb amputation alters the brain's structural network. Dominant-side amputees showed reduced fractional anisotropy (FA) network strength, particularly in sensorimotor areas, suggesting brain network degeneration after amputation.

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    Area of Science:

    • Neuroscience
    • Neuroimaging
    • Brain Network Analysis

    Background:

    • Functional brain networks reorganize after amputation.
    • The impact of amputation on structural brain networks is not well understood.

    Purpose of the Study:

    • To investigate changes in the fractional anisotropy (FA) network following unilateral upper-limb amputation.
    • To explore the relationship between structural brain network alterations and clinical factors like residual limb usage and phantom limb sensation.

    Main Methods:

    • Diffusion tensor imaging (DTI) was used to acquire brain data from 22 upper-limb amputees and 15 healthy controls.
    • DTI tractography and graph theoretical analyses were employed to examine topological changes in the FA network.
    • Structural network properties, including global mean strength and nodal strength, were compared between groups.

    Main Results:

    • Dominant-side amputees exhibited reduced global mean strength and increased characteristic path length in their FA network compared to controls.
    • Decreased nodal strength was observed in the contralateral sensorimotor and visual areas of dominant-side amputees.
    • Nodal strength in the postcentral gyrus correlated negatively with residual limb usage, and in the middle temporal gyrus, positively with phantom limb sensation magnitude.

    Conclusions:

    • Dominant-side upper-limb amputation leads to a degeneration of the fractional anisotropy (FA) brain network.
    • Observed network changes reflect use-dependent reorganization and are associated with phantom limb sensations.
    • These findings highlight the profound impact of amputation on the brain's structural integrity.