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Alpha-band activity in parietofrontal cortex predicts future availability of vibrotactile feedback in prosthesis use

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Abstract

Prosthesis disuse and abandonment is an ongoing issue in upper-limb amputation. In addition to lost structural and motor function, amputation also results in decreased task-specific sensory information. One proposed remedy is augmenting somatosensory information using vibrotactile feedback to provide tactile feedback of grasping objects. While the role of frontal and parietal areas in motor tasks is well established, the neural and kinematic effects of this augmented vibrotactile feedback remain in question. In this study, we sought to understand the neurobehavioral effects of providing augmented feedback during a reach-grasp-transport task. Ten persons with sound limbs performed a motor task while wearing a prosthesis simulator with and without vibrotactile feedback. We hypothesized that providing vibrotactile feedback during prosthesis use would increase activity in frontal and parietal areas and improve grasp-related behavior. Results show that anticipation of upcoming vibrotactile feedback may be encoded in motor and parietal areas during the reach-to-grasp phase of the task. While grasp aperture is unaffected by vibrotactile feedback, the availability of vibrotactile feedback does lead to a reduction in velocity during object transport. These results help shed light on how engineered feedback is utilized by prostheses users and provide methodologies for further assessment in advanced prosthetics research.

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Availability of data and material

The datasets generated during and/or analyzed during the current study are available in the SMARTech repository, https://doi.org/10.35090/gatech/66286.

Code availability

Code to process the datasets are available in the SMARTech repository, https://doi.org/10.35090/gatech/66286.

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Acknowledgements

The authors thank the research participants, without whom the study would not have been possible.

Funding

Partial funding by National Institutes of Health T32HD055180.

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Authors and Affiliations

Authors

Contributions

JTJ, LAW and FLHIII contributed to study conception and design. Engineering was performed by JTJ. Data collection and analysis were performed by JTJ, DdM and HD. The manuscript was written by JTJ, and edited by LAW. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Lewis A. Wheaton.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethics approval

Approved by the Georgia Tech Institutional Review Board, Protocol H16103.

Consent to participate

Informed consent was obtained from all individual participants included in the study.

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Not applicable. No personally identifiable information is presented.

Additional information

Communicated by Winston D Byblow.

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Johnson, J.T., de Mari, D., Doherty, H. et al. Alpha-band activity in parietofrontal cortex predicts future availability of vibrotactile feedback in prosthesis use. Exp Brain Res 240, 1387–1398 (2022). https://doi.org/10.1007/s00221-022-06340-8

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  • DOI: https://doi.org/10.1007/s00221-022-06340-8

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