Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study
Previous studies have demonstrated that motor imagery leads to desynchronization in the alpha rhythm within the contralateral primary motor cortex. However, the underlying electrophysiological mechanisms responsible for this desynchronization during motor imagery remain unclear. To examine this ques...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2023-01-01
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| Series: | IEEE Transactions on Neural Systems and Rehabilitation Engineering |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10256255/ |
| _version_ | 1797671521047543808 |
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| author | Houmin Wang Huixian Zheng Yu Yang Kenneth N. K. Fong Jinyi Long |
| author_facet | Houmin Wang Huixian Zheng Yu Yang Kenneth N. K. Fong Jinyi Long |
| author_sort | Houmin Wang |
| collection | DOAJ |
| description | Previous studies have demonstrated that motor imagery leads to desynchronization in the alpha rhythm within the contralateral primary motor cortex. However, the underlying electrophysiological mechanisms responsible for this desynchronization during motor imagery remain unclear. To examine this question, we conducted an investigation using EEG in combination with noninvasive transcranial magnetic stimulation (TMS) during index finger abduction (ABD) and power grip imaginations. The TMS was administered employing diverse coil orientations to selectively stimulate corticospinal axons, aiming to target both early and late synaptic inputs to corticospinal neurons. TMS was triggered based on the alpha power levels, categorized in 20th percentile bins, derived from the individual alpha power distribution during the imagined tasks of ABD and power grip. Our analysis revealed negative correlations between alpha power and motor evoked potential (MEP) amplitude, as well as positive correlations with MEP latency across all coil orientations for each imagined task. Furthermore, we conducted functional network analysis in the alpha band to explore network connectivity during imagined index finger abduction and power grip tasks. Our findings indicate that network connections were denser in the fronto-parietal area during imagined ABD compared to power grip conditions. Moreover, the functional network properties demonstrated potential for effectively classifying between these two imagined tasks. These results provide functional evidence supporting the hypothesis that alpha oscillations may play a role in suppressing MEP amplitude and latency during imagined power grip. We propose that imagined ABD and power grip tasks may activate different populations and densities of axons at the cortical level. |
| first_indexed | 2024-03-11T21:16:45Z |
| format | Article |
| id | doaj.art-39632f85c7e94695b38737c2bb6654b1 |
| institution | Directory Open Access Journal |
| issn | 1558-0210 |
| language | English |
| last_indexed | 2024-03-11T21:16:45Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Transactions on Neural Systems and Rehabilitation Engineering |
| spelling | doaj.art-39632f85c7e94695b38737c2bb6654b12023-09-28T23:00:08ZengIEEEIEEE Transactions on Neural Systems and Rehabilitation Engineering1558-02102023-01-01313813382210.1109/TNSRE.2023.331781310256255Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS StudyHoumin Wang0Huixian Zheng1Yu Yang2Kenneth N. K. Fong3https://orcid.org/0000-0001-5909-4847Jinyi Long4https://orcid.org/0000-0001-6150-987XCollege of Information Science and Technology, Jinan University, Guangzhou, ChinaCollege of Information Science and Technology, Jinan University, Guangzhou, ChinaCollege of Information Science and Technology, Jinan University, Guangzhou, ChinaDepartment of Rehabilitation Sciences, The Hong Kong Polytechnic University Kowloon, Hong Kong, SARCollege of Information Science and Technology, Jinan University, Guangzhou, ChinaPrevious studies have demonstrated that motor imagery leads to desynchronization in the alpha rhythm within the contralateral primary motor cortex. However, the underlying electrophysiological mechanisms responsible for this desynchronization during motor imagery remain unclear. To examine this question, we conducted an investigation using EEG in combination with noninvasive transcranial magnetic stimulation (TMS) during index finger abduction (ABD) and power grip imaginations. The TMS was administered employing diverse coil orientations to selectively stimulate corticospinal axons, aiming to target both early and late synaptic inputs to corticospinal neurons. TMS was triggered based on the alpha power levels, categorized in 20th percentile bins, derived from the individual alpha power distribution during the imagined tasks of ABD and power grip. Our analysis revealed negative correlations between alpha power and motor evoked potential (MEP) amplitude, as well as positive correlations with MEP latency across all coil orientations for each imagined task. Furthermore, we conducted functional network analysis in the alpha band to explore network connectivity during imagined index finger abduction and power grip tasks. Our findings indicate that network connections were denser in the fronto-parietal area during imagined ABD compared to power grip conditions. Moreover, the functional network properties demonstrated potential for effectively classifying between these two imagined tasks. These results provide functional evidence supporting the hypothesis that alpha oscillations may play a role in suppressing MEP amplitude and latency during imagined power grip. We propose that imagined ABD and power grip tasks may activate different populations and densities of axons at the cortical level.https://ieeexplore.ieee.org/document/10256255/Alpha powermotor imagerytranscranial magnetic stimulation (TMS)I-wavesmachine learning |
| spellingShingle | Houmin Wang Huixian Zheng Yu Yang Kenneth N. K. Fong Jinyi Long Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study IEEE Transactions on Neural Systems and Rehabilitation Engineering Alpha power motor imagery transcranial magnetic stimulation (TMS) I-waves machine learning |
| title | Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study |
| title_full | Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study |
| title_fullStr | Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study |
| title_full_unstemmed | Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study |
| title_short | Cortical Contributions to Imagined Power Grip Task: An EEG-Triggered TMS Study |
| title_sort | cortical contributions to imagined power grip task an eeg triggered tms study |
| topic | Alpha power motor imagery transcranial magnetic stimulation (TMS) I-waves machine learning |
| url | https://ieeexplore.ieee.org/document/10256255/ |
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