Ketinggian Pengaktifan Korteks dan Kebergantungan Hemodinamiknya semasa Tepikan Jari Rentak Sendiri Bilateral Pelbagai Gaya

This single participant functional magnetic resonance imaging (fMRI) study investigates the fundamental relationship between several hemodynamic parameters and the height extent of activation (t-value) for several motor-related cortices. In this study the participant performed four styles of self-paced hand finger tapping which are soft-slow (SS), soft-fast (SF), hard-slow (HS) and hard-fast (HF) in an fMRI scan. The fMRI data were analysed using statistical parametric mapping (SPM). The analytical results indicated that the brain coordinates all four tapping styles with the involvement of bilateral precentral gyrus (PCG), supplementary motor area (SMA), bilateral superior parietal lobules (SPL) and cerebellum. SPL was found to exhibit laterality shift due to the increase in tapping speed. A lower activation magnitude in the left SPL occurs during slow tapping while fast tapping exhibits higher activation magnitud in the right SPL. The t-values versus percentage of signal change (PSC) plot for all regions and for all tapping styles exhibits positive correlation (p 0.05, ρ= 0.67). The t value shows insignificant positive correlation with neuronal efficacy (p= 0.08, ρ= 0.40), significant positive correlation with signal decay (p 0.05, ρ= 0.85) and transit time (p 0.05, ρ= 0.88) and significant negative correlation with feedback (p 0.05, ρ= 0.89). The stiffness coefficient (α) and the percentage of oxygen extraction (Eo) remain constant for all cortices in all tapping styles. This study has revealed useful fundamental informations on the hemodynamic characteristics of several activated motor related cortices.