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Spinal and Cerebral Integration of Noxious Inputs in Left-handed Individuals

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Abstract

Some pain-related information is processed preferentially in the right cerebral hemisphere. Considering that functional lateralization can be affected by handedness, spinal and cerebral pain-related responses may be different between right- and left-handed individuals. Therefore, this study aimed to investigate the cortical and spinal mechanisms of nociceptive integration when nociceptive stimuli are applied to right -handed vs. left -handed individuals. The NFR, evoked potentials (ERP: P45, N100, P260), and event-related spectral perturbations (ERSP: theta, alpha, beta and gamma band oscillations) were compared between ten right-handed and ten left-handed participants. Pain was induced by transcutaneous electrical stimulation of the lower limbs and left upper limb. Stimulation intensity was adjusted individually in five counterbalanced conditions of 21 stimuli each: three unilateral (right lower limb, left lower limb, and left upper limb stimulation) and two bilateral conditions (right and left lower limbs, and the right lower limb and left upper limb stimulation). The amplitude of the NFR, ERP, ERSP, and pain ratings were compared between groups and conditions using a mixed ANOVA. A significant increase of responses was observed in bilateral compared with unilateral conditions for pain intensity, NFR amplitude, N100, theta oscillations, and gamma oscillations. However, these effects were not significantly different between right- and left-handed individuals. These results suggest that spinal and cerebral integration of bilateral nociceptive inputs is similar between right- and left-handed individuals. They also imply that pain-related responses measured in this study may be examined independently of handedness.

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Availability of data and material

The datasets generated during the current study are available from the corresponding author on reasonable request.

Code availability

The codes generated during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by a grant from the Natural Science and Engineering Research Council of Canada (#06659) and the Canadian Foundation for Innovation (#33731). The contribution of Stéphane Northon was supported by the Fonds de Recherche du Québec en Nature et Technologie. The contribution of Zoha Deldar was supported by the Department of Anatomy of the Université du Québec à Trois-Rivières and the Centre de recherche en Neuropsychologie et Cognition. The contribution of Mathieu Piché was supported by the Fonds de Recherche du Québec en Santé. Figure 1 was created with BioRender.com.

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Contributions

All authors contributed significantly to this study and has read the final version of the manuscript. Stéphane Northon and Zoha Deldar contributed equally to this work. S.N. contributed to data collection and analyses and manuscript writing. Z.D contributed to data collection and wrote the first version of the manuscript. M.P. contributed to study design, data collection, analyses and interpretation, wrote the final version of the manuscript and obtained funding.

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Correspondence to Mathieu Piché.

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Conflict of interest

The authors declare no competing interests and no relationship that may lead to any conflict of interest.

Ethical approval

All experimental procedures conformed to the standards set by the latest revision of the Declaration of Helsinki and were approved by the Research Ethics Board of the Université du Québec à Trois-Rivières.

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All participants received written informed consent, acknowledged their right to withdraw from the experiment without prejudice, and received a compensation of $25 for their travel expenses, time, and commitment.

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Not applicable.

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Handling Editor: Micah M. Murray.

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Northon, S., Deldar, Z. & Piché, M. Spinal and Cerebral Integration of Noxious Inputs in Left-handed Individuals. Brain Topogr 34, 568–586 (2021). https://doi.org/10.1007/s10548-021-00864-y

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  • DOI: https://doi.org/10.1007/s10548-021-00864-y

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