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Functional topography of the primary motor cortex during motor execution and motor imagery as revealed by functional MRI.
Makary, Meena M; Eun, Seulgi; Soliman, Ramy S; Mohamed, Abdalla Z; Lee, Jeungchan; Park, Kyungmo.
Afiliação
  • Makary MM; aDepartment of Biomedical Engineering, Kyung Hee University, Yongin, Republic of Korea bDepartment of Radiology, Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Neuroreport ; 28(12): 731-738, 2017 Aug 16.
Article em En | MEDLINE | ID: mdl-28617759
ABSTRACT
Controversy exists regarding the involvement of the primary motor cortex (M1) during motor imagery (MI) and also regarding the differential somatotopic representation of motor execution (ME) and mental simulation of movement, that is, MI within M1. Although some research reported clear M1 involvement during MI without overt motor output, others did not. However, possible somatotopic representation between execution and imagery has not been clearly investigated to date. The aim of the present study was to aid in the resolution of this controversy by investigating the possible involvement of M1 during MI, and the differential, within M1, somatotopic representation between execution and imagery by quantitatively assessing different location markers such as activation peak and center of mass as well as intensity differences between the two tasks in case of with and without the overlap between the two representations. Forty-one healthy volunteers participated in two functional MRI runs of mouth-stretching ME and MI tasks. Our findings suggest the clear involvement of M1 (BA 4) during MI with lower signal intensity compared with ME, and further showed distinct centers for each representation along the y-axis (anteroposterior plane), with MI showing more involvement of the anterior sector of M1 (BA 4a), whereas ME recruited more of the posterior sector (BA 4p). These results parallel the pioneering findings of a functional distinction between BA 4a and BA 4p, where BA 4a is more involved in the cognitive aspects of MI, whereas BA 4p is more related to executive function, promoting the idea of distinctive somatotopic mapping between execution and imagery within M1 sectors.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Imaginação / Atividade Motora / Córtex Motor Tipo de estudo: Etiology_studies / Incidence_studies / Observational_studies / Risk_factors_studies Limite: Adult / Female / Humans / Male Idioma: En Revista: Neuroreport Assunto da revista: NEUROLOGIA Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Imaginação / Atividade Motora / Córtex Motor Tipo de estudo: Etiology_studies / Incidence_studies / Observational_studies / Risk_factors_studies Limite: Adult / Female / Humans / Male Idioma: En Revista: Neuroreport Assunto da revista: NEUROLOGIA Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Estados Unidos