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Effects of TMS over the anterior intraparietal area on anticipatory fingertip force scaling and the size-weight illusion

View ORCID ProfileVonne van Polanen, Gavin Buckingham, View ORCID ProfileMarco Davare
doi: https://doi.org/10.1101/2020.05.18.101675
Vonne van Polanen
1Movement Control and Neuroplasticity Research Group, Department of Movement Sciences, Biomedical Sciences group, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium
2Leuven Brain Institute, KU Leuven, 3001 Leuven, Belgium
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  • For correspondence: vonne.vanpolanen@kuleuven.be
Gavin Buckingham
3Sport and Health Sciences, University of Exeter, EX1 2LU Exeter, United Kingdom
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Marco Davare
1Movement Control and Neuroplasticity Research Group, Department of Movement Sciences, Biomedical Sciences group, KU Leuven, Tervuursevest 101, 3001 Leuven, Belgium
4Department of Clinical Sciences, College of Health and Life Sciences, Brunel University London, UB8 3PN Uxbridge, United Kingdom
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ABSTRACT

In skilled object lifting, fingertip forces need to be carefully scaled to object weight, which can be inferred from object properties, such as size or material. This anticipatory force scaling ensures smooth and efficient lifting movements. However, even with accurate motor plans, weight perception can still be biased. In the size-weight illusion, objects of different size but equal weight are perceived to differ in heaviness, with the small object perceived to be heavier than the large object. The neural underpinnings of the size-weight illusion and anticipatory force scaling to object size are largely unknown. In this study, we hypothesized a possible role of the anterior intraparietal cortex (aIPS) in predictive force scaling and the size-weight illusion, which we investigated by applying continuous theta burst stimulation (cTBS) prior to participants lifting objects designed to induce the size-weight illusion. Participants received cTBS over aIPS, the primary motor cortex (control area), or sham stimulation. We found no evidence that aIPS stimulation affected the size-weight illusion. Small effects were, however, found on anticipatory force scaling, where grip force was less tuned to object size during initial lifts. These findings suggest that, while aIPS might be peripherally involved in sensorimotor prediction, other brain areas underpin the processes that mediate the size-weight illusion.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted May 20, 2020.
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Effects of TMS over the anterior intraparietal area on anticipatory fingertip force scaling and the size-weight illusion
Vonne van Polanen, Gavin Buckingham, Marco Davare
bioRxiv 2020.05.18.101675; doi: https://doi.org/10.1101/2020.05.18.101675
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Effects of TMS over the anterior intraparietal area on anticipatory fingertip force scaling and the size-weight illusion
Vonne van Polanen, Gavin Buckingham, Marco Davare
bioRxiv 2020.05.18.101675; doi: https://doi.org/10.1101/2020.05.18.101675

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