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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Motor system recruitment during action observation: No correlation between murhythm desynchronization and corticospinal excitability

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Lapenta, Olivia M. [1, 2] ; Ferrari, Elisabetta [3] ; Boggio, Paulo S. [2] ; Fadiga, Luciano [4, 5] ; D'Ausilio, Alessandro [4, 5]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Western Sydney Univ, MARCS Inst Brain Behav & Dev, Penrith, NSW - Australia
[2] Univ Presbiteriana Mackenzie, Ctr Hlth & Biol Sci, Social & Cognit Neurosci Lab, Sao Paulo, SP - Brazil
[3] Univ Udine, Dept Languages & Literatures, Commun Educ & Soc, Udine - Italy
[4] Univ Ferrara, Sect Human Physiol, Ferrara - Italy
[5] Fdn Ist Italiano Tecnol, Ctr Translat Neurophysiol Speech & Commun, Ferrara - Italy
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: PLoS One; v. 13, n. 11 NOV 15 2018.
Citações Web of Science: 3

Observing others' actions desynchronizes electroencephalographic (EEG) rhythms and modulates corticospinal excitability as assessed by transcranial magnetic stimulation (TMS). However, it remains unclear if these measures reflect similar neurofunctional mechanisms at the individual level. In the present study, a within-subject experiment was designed to assess these two neurophysiological indexes and to quantify their mutual correlation. Participants observed reach-to-grasp actions directed towards a small (precision grip) or a large object (power grip). We focused on two specific time points for both EEG and TMS. The first time point (t1) coincided with the maximum hand aperture, i.e. the moment at which a significant modulation of corticospinal excitability is expected. The second (t2), coincided with the EEG resynchronization occurring at the end of the action, i.e. the moment at which a hypothetic minimum for action observation effect is expected. Results showed a Mu rhythm bilateral desynchronization at t1 with differential resynchronization at t2 in the two hemispheres. Beta rhythm was more desynchronized in the left hemisphere at both time points. These EEG differences, however, were not influenced by grip type. Conversely, motor potentials evoked by TMS in an intrinsic hand muscle revealed an interaction effect of grip and time. No significant correlations between Mu/Beta rhythms and motor evoked potentials were found. These findings are discussed considering the spatial and temporal resolution of the two investigated techniques and argue over two alternative explanations: i. each technique provides different measures of the same process or ii. they describe complementary features of the action observation network in humans. (AU)

Processo FAPESP: 12/24696-1 - A importância da rede cortical motora na percepção de movimentos humanos
Beneficiário:Olivia Morgan Lapenta
Linha de fomento: Bolsas no Brasil - Doutorado