The intensity and spatial distribution of functional activation in the left precentral and postcentral gyri during actual motor performance (MP) and mental representation [motor imagery (MI)] of self-paced finger-to-thumb opposition movements of the dominant hand were investigated in fourteen right-handed volunteers by functional magnetic resonance imaging (fMRI) techniques. Significant increases in mean normalized fMRI signal intensities over values obtained during the control (visual imagery) tasks were found in a region including the anterior bank and crown of the central sulcus, the presumed site of the primary motor cortex, during both MP (mean percentage increase, 2.1%) and MI (0.8%). In the anterior portion of the precentral gyrus and the postcentral gyrus, mean functional activity levels were also increased during both conditions (MP, 1.7 and 1.2%; MI, 0.6 and 0.4%, respectively). To locate activated foci during MI, MP, or both conditions, the time course of the signal intensities of pixels lying in the precentral or postcentral gyrus was plotted against single-step or double-step waveforms, where the steps of the waveform corresponded to different tasks. Pixels significantly (r > 0.7) activated during both MP and MI were identified in each region in the majority of subjects; percentage increases in signal intensity during MI were on average 30% as great as increases during MP. The pixels activated during both MP and MI appear to represent a large fraction of the whole population-activated during MP. These results support the hypothesis that MI and MP involve overlapping neural networks in perirolandic cortical areas.
|Data di pubblicazione:||1996|
|Titolo:||Primary motor and sensory cortex activation during motor performance and motor imagery: A functional magnetic resonance imaging study|
|Autore/i:||Porro CA; Francescato MP; Cettolo V; Diamond ME; Baraldi P; Zuiani C; Bazzocchi M; diPrampero PE|
|Codice identificativo ISI:||WOS:A1996VY43300030|
|Codice identificativo Scopus:||2-s2.0-0029860593|
|Codice identificativo Pubmed:||8922425|
|Citazione:||Primary motor and sensory cortex activation during motor performance and motor imagery: A functional magnetic resonance imaging study / Porro CA; Francescato MP; Cettolo V; Diamond ME; Baraldi P; Zuiani C; Bazzocchi M; diPrampero PE. - In: THE JOURNAL OF NEUROSCIENCE. - ISSN 0270-6474. - STAMPA. - 16(1996), pp. 7688-7698.|
|Tipologia||Articolo su rivista|
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