Abstract
| Original language | English |
|---|---|
| Journal | PLoS One |
| Volume | 9 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2014 |
| Externally published | Yes |
Keywords
- adult
- anisotropy
- brain mapping
- corpus callosum
- diffusion weighted imaging
- evoked muscle response
- female
- hand
- hemispheric dominance
- human
- leg
- male
- motor cortex
- muscle contraction
- nuclear magnetic resonance imaging
- physiology
- psychomotor performance
- regression analysis
- transcranial magnetic stimulation
- Adult
- Anisotropy
- Brain Mapping
- Corpus Callosum
- Diffusion Magnetic Resonance Imaging
- Evoked Potentials, Motor
- Female
- Functional Laterality
- Hand
- Humans
- Leg
- Magnetic Resonance Imaging
- Male
- Motor Cortex
- Muscle Contraction
- Psychomotor Performance
- Regression Analysis
- Transcranial Magnetic Stimulation
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In: PLoS One, Vol. 9, No. 8, 2014.
Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Fractional anisotropy in corpus callosum is associated with facilitation of motor representation during ipsilateral hand movements
AU - Chiou, Shin-Yi
AU - Wang, Ray-Yau
AU - Roberts, Richard Edward
AU - Wu, Yu-Te
AU - Lu, Chia-Feng
AU - Liao, Kwong-Kum
AU - Yang, Yea-Ru
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PY - 2014
Y1 - 2014
N2 - Background: Coactivation of primary motor cortex ipsilateral to a unilateral movement (M1ipsilateral) has been observed, and the magnitude of activation is influenced by the contracting muscles. It has been suggested that the microstructural integrity of the callosal motor fibers (CMFs) connecting M1 regions may reflect the observed response. However, the association between the structural connectivity of CMFs and functional changes in M1ipsilateral remains unclear. The purpose of this study was to investigate the relationship between functional changes within M1 ipsilateral during unilateral arm or leg movements and the microstructure of the CMFs connecting both homotopic representations (arm or leg). Methods: Transcranial magnetic stimulation was used to assess changes in motor evoked potentials (MEP) in an arm muscle during unilateral movements compared to rest in fifteen healthy adults. Functional magnetic resonance imaging was then used to identify regions of M1 associated with either arm or leg movements. Diffusion-weighted imaging data was acquired to generate CMFs for arm and leg areas using the areas of activation from the functional imaging as seed masks. Individual values of regional fractional anisotropy (FA) of arm and leg CMFs was then calculated by examining the overlap between CMFs and a standard atlas of corpus callosum. Results: The change in the MEP was significantly larger in the arm movement compared to the leg movement. Additionally, regression analysis revealed that FA in the arm CMFs was positively correlated with the change in MEP during arm movement, whereas a negative correlation was observed during the leg movement. However, there was no significant relationship between FA in the leg CMF and the change in MEP during the movements. Conclusions: These findings suggest that individual differences in interhemispheric structural connectivity may be used to explain a homologous muscle-dominant effect within M1ipsilateral hand representation during unilateral movement with topographical specificity. © 2014 Chiou et al.
AB - Background: Coactivation of primary motor cortex ipsilateral to a unilateral movement (M1ipsilateral) has been observed, and the magnitude of activation is influenced by the contracting muscles. It has been suggested that the microstructural integrity of the callosal motor fibers (CMFs) connecting M1 regions may reflect the observed response. However, the association between the structural connectivity of CMFs and functional changes in M1ipsilateral remains unclear. The purpose of this study was to investigate the relationship between functional changes within M1 ipsilateral during unilateral arm or leg movements and the microstructure of the CMFs connecting both homotopic representations (arm or leg). Methods: Transcranial magnetic stimulation was used to assess changes in motor evoked potentials (MEP) in an arm muscle during unilateral movements compared to rest in fifteen healthy adults. Functional magnetic resonance imaging was then used to identify regions of M1 associated with either arm or leg movements. Diffusion-weighted imaging data was acquired to generate CMFs for arm and leg areas using the areas of activation from the functional imaging as seed masks. Individual values of regional fractional anisotropy (FA) of arm and leg CMFs was then calculated by examining the overlap between CMFs and a standard atlas of corpus callosum. Results: The change in the MEP was significantly larger in the arm movement compared to the leg movement. Additionally, regression analysis revealed that FA in the arm CMFs was positively correlated with the change in MEP during arm movement, whereas a negative correlation was observed during the leg movement. However, there was no significant relationship between FA in the leg CMF and the change in MEP during the movements. Conclusions: These findings suggest that individual differences in interhemispheric structural connectivity may be used to explain a homologous muscle-dominant effect within M1ipsilateral hand representation during unilateral movement with topographical specificity. © 2014 Chiou et al.
KW - adult
KW - anisotropy
KW - brain mapping
KW - corpus callosum
KW - diffusion weighted imaging
KW - evoked muscle response
KW - female
KW - hand
KW - hemispheric dominance
KW - human
KW - leg
KW - male
KW - motor cortex
KW - muscle contraction
KW - nuclear magnetic resonance imaging
KW - physiology
KW - psychomotor performance
KW - regression analysis
KW - transcranial magnetic stimulation
KW - Adult
KW - Anisotropy
KW - Brain Mapping
KW - Corpus Callosum
KW - Diffusion Magnetic Resonance Imaging
KW - Evoked Potentials, Motor
KW - Female
KW - Functional Laterality
KW - Hand
KW - Humans
KW - Leg
KW - Magnetic Resonance Imaging
KW - Male
KW - Motor Cortex
KW - Muscle Contraction
KW - Psychomotor Performance
KW - Regression Analysis
KW - Transcranial Magnetic Stimulation
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84905965750&partnerID=40&md5=94e6059a84de014d05fa541c3b914f57
UR - https://www.scopus.com/results/citedbyresults.uri?sort=plf-f&cite=2-s2.0-84905965750&src=s&imp=t&sid=78cccaecf7506c61c3f1e924fe82e1b0&sot=cite&sdt=a&sl=0&origin=recordpage&editSaveSearch=&txGid=230533b47135a2129a38c0e44df2706c
U2 - 10.1371/journal.pone.0104218
DO - 10.1371/journal.pone.0104218
M3 - Article
SN - 1932-6203
VL - 9
JO - PLoS One
JF - PLoS One
IS - 8
ER -