An EEG/MEG study of anticipatory postural adjustment in a bimanual load-lifting task

Tommy Ng, Paul Sowman, Jon Brock, Blake Johnson

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

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    Abstract

    Anticipatory postural adjustments (APA) are necessary for counteracting destabilizing forces induced by prime movements. The present study examined APA in a bimanual load-lifting task using simultaneous electroencephalography (EEG) and magnetoencephalography (MEG). A 1-kg weight placed on the left arm was either lifted by an experimenter (imposed condition) or by the subject (voluntary condition). In the imposed condition, inhibition of electromyographic (EMG) activity in the load-bearing muscle (biceps brachii, BB) only occurred after the onset of unloading and was accompanied by event-related desynchronisation (ERD) of cortical activity in the beta frequency band (15-30 Hz). This ERD was localized to the primary sensory cortex using beamforming analyses. In the voluntary condition, EMG inhibition and beta ERD occurred prior to the onset of lifting and beta ERD was localized to the primary motor cortex. This anticipatory cortical and muscle activity ties in well with the feedforward property of APA. This paradigm will be used to study problems of neuro-motor coordination in autism spectrum disorders (ASD).
    Original languageEnglish
    Title of host publicationASCS09
    Subtitle of host publicationproceedings of the 9th conference of the Australasian Society for Cognitive Science
    EditorsWayne Christensen, Elizabeth Schier, John Sutton
    Place of PublicationNorth Ryde, NSW
    PublisherMacquarie Centre for Cognitive Science
    Pages261-268
    Number of pages8
    ISBN (Print)9780646529189
    DOIs
    Publication statusPublished - 2010
    EventConference of the Australasian Society for Cognitive Science (9th : 2009) - Sydney
    Duration: 30 Sep 20092 Oct 2009

    Conference

    ConferenceConference of the Australasian Society for Cognitive Science (9th : 2009)
    CitySydney
    Period30/09/092/10/09

    Bibliographical note

    Copyright 2009 by the Australasian Society for Cognitive Science. Publisher version archived with the permission of the Editor, ASCS09 : Proceedings of the 9th Conference of the Australasian Society for Cognitive Science. This copy is available for individual, non-commercial use. Permission to reprint/republish this version for other uses must be obtained from the publisher.

    Keywords

    • event-related desynchronisation
    • anticipatory postural adjustment
    • bimanual coordination
    • autism spectrum disorder

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