Previous literature has shown that the ability to track a moving target with the eye is substantially improved when the target is self-moved as compared to when it is moved by an external agent. To account for this result, it has been proposed that the oculomotor system has access to an estimate of the current hand position by means of a forward model that receives the arm efferent copy. However, direct neurophysiological evidence is needed to support this scheme. The goal of the current study was to explore whether eye motion could possibly be altered by TMS over the hand area of the primary motor cortex (M1) during eye-hand coordination. Practically subjects were asked to track with their eyes a visual target whose horizontal motion was driven by their grip force. When TMS was applied over M1 hand area, involuntary grip force pulse led to transient target jumps. We reasoned that if the output of M1 is used by the oculomotor system to keep track of the target, TMS on top of disturbing grip force, should also disrupt eye motion. For comparison purposes, the effect of TMS was also monitored when TMS was applied while tracking externally-moved target. In agreement with earlier observations, the current results showed that eye tracking performance is improved when the target is self-moved as compared to when being externally-moved. More importantly, our data suggest that eye motion is poorly influenced by TMS over M1. Indeed when the target was externally-moved, TMS did not disrupt eye motion. Furthermore during Eye-Hand coordination TMS induced an increase in eye-tracking error, but a very similar observation was noticed when using SHAM mimicking the visual effect of TMS on target motion. Overall the results of this TMS study suggest that the output of M1 has limited contribution to eye tracking performance during Eye-Hand coordination.


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    Titel :

    Investigating the contribution of M1 in Eye-Hand coordination using TMS



    Erscheinungsdatum :

    2016-01-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    DDC:    629



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