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Functional plasticity of surround inhibition in the motor cortex during single finger contraction training.
Neuroreport. 2012 Aug 01; 23(11):663-7.N

Abstract

We investigated the functional changes in short intracortical inhibitory (SICI) circuits to determine whether surround inhibition is altered during a simple finger movement training. Using an electromyographic (EMG) feedback system linked to a computer monitor, participants practiced sustained index finger abduction by 40% maximum voluntary contraction of the first dorsal interosseous (FDI) while decreasing overflow EMG activity of the abductor digiti minimi (ADM) to less than 5% maximum voluntary contraction. Single transcranial magnetic stimuli (TMS) and paired-pulse TMS were applied to the left primary motor cortex to elicit motor-evoked potentials (MEPs) in the right FDI and ADM before/after training. In addition to recording MEPs from both muscles during voluntary FDI contraction, MEPs were recorded during motor imagery. MEPs from the FDI were not altered by training, indicating no functional changes in SICI circuits associated with the FDI field. In contrast, SICI circuits associated with ADM were significantly strengthened by training, as indicated by reduced baseline EMG activity during both actual FDI contraction and motor imagery and by reduced MEPs in response to post-training TMS. We propose that SICI circuits show functional plasticity during motor training and that surround circuit inhibition of nontarget muscle groups increases in proportion to the acquisition of motor skills.

Authors+Show Affiliations

Division of Physical Therapy, School of Rehabilitation, Faculty of Health and Social Services, Kanagawa University of Human Services, Kanagawa, Japan. sugawara-k@kuhs.ac.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22643236

Citation

Sugawara, Kenichi, et al. "Functional Plasticity of Surround Inhibition in the Motor Cortex During Single Finger Contraction Training." Neuroreport, vol. 23, no. 11, 2012, pp. 663-7.
Sugawara K, Tanabe S, Higashi T, et al. Functional plasticity of surround inhibition in the motor cortex during single finger contraction training. Neuroreport. 2012;23(11):663-7.
Sugawara, K., Tanabe, S., Higashi, T., Suzuki, T., Tsurumi, T., & Kasai, T. (2012). Functional plasticity of surround inhibition in the motor cortex during single finger contraction training. Neuroreport, 23(11), 663-7. https://doi.org/10.1097/WNR.0b013e3283556522
Sugawara K, et al. Functional Plasticity of Surround Inhibition in the Motor Cortex During Single Finger Contraction Training. Neuroreport. 2012 Aug 1;23(11):663-7. PubMed PMID: 22643236.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Functional plasticity of surround inhibition in the motor cortex during single finger contraction training. AU - Sugawara,Kenichi, AU - Tanabe,Shigeo, AU - Higashi,Toshio, AU - Suzuki,Tomotaka, AU - Tsurumi,Takamasa, AU - Kasai,Tatsuya, PY - 2012/5/31/entrez PY - 2012/5/31/pubmed PY - 2012/12/10/medline SP - 663 EP - 7 JF - Neuroreport JO - Neuroreport VL - 23 IS - 11 N2 - We investigated the functional changes in short intracortical inhibitory (SICI) circuits to determine whether surround inhibition is altered during a simple finger movement training. Using an electromyographic (EMG) feedback system linked to a computer monitor, participants practiced sustained index finger abduction by 40% maximum voluntary contraction of the first dorsal interosseous (FDI) while decreasing overflow EMG activity of the abductor digiti minimi (ADM) to less than 5% maximum voluntary contraction. Single transcranial magnetic stimuli (TMS) and paired-pulse TMS were applied to the left primary motor cortex to elicit motor-evoked potentials (MEPs) in the right FDI and ADM before/after training. In addition to recording MEPs from both muscles during voluntary FDI contraction, MEPs were recorded during motor imagery. MEPs from the FDI were not altered by training, indicating no functional changes in SICI circuits associated with the FDI field. In contrast, SICI circuits associated with ADM were significantly strengthened by training, as indicated by reduced baseline EMG activity during both actual FDI contraction and motor imagery and by reduced MEPs in response to post-training TMS. We propose that SICI circuits show functional plasticity during motor training and that surround circuit inhibition of nontarget muscle groups increases in proportion to the acquisition of motor skills. SN - 1473-558X UR - https://www.unboundmedicine.com/medline/citation/22643236/Functional_plasticity_of_surround_inhibition_in_the_motor_cortex_during_single_finger_contraction_training_ L2 - https://doi.org/10.1097/WNR.0b013e3283556522 DB - PRIME DP - Unbound Medicine ER -