Home Computer Science Computational Diffusion MRI: MICCAI Workshop, Athens, Greece, October 2016
Investigation of the Neurite Density in the Sensorymotor Cortex
For the hand motor contrast, the first row of Fig. 5 shows an important activity in the primary motor and the sensorymotor cortex assessed by strong z-scores. For the “Left minus Right click” contrast, we highlight the right hemisphere and the left one for the “Right minus Left click” contrast as expected knowing the contralateral control of motor areas.
The second row of the Fig. 5 depicts Dice index values for each cortical region. We computed a t-test and found that the precentral gyrus, the central sulcus and the post central gyrus are significantly different in term of Dice index compared to the homologous cortical regions on the other hemisphere. The contralateral pattern of
Fig. 5 Group level maps for the hand motor contrasts: (top-left) z-scores for the “Right-Left click” contrast at the vertex level; (top-right) z-scores for the “Left-Right click” contrast at the vertex level; (bottom-left) Dice index results for the “Right-Left click” contrast at the cortical area level; (bottom-right) Dice index results for the “Left-Right click” contrast at the cortical area level the motor areas implies that for the right hand motor contrast, the left hemisphere regions show more activity and the other way around when it is the left hand motor contrast. The colocalization of peaks of neurite density and functional activity is thus assessed by the Dice index. A noteworthy fact is that the Dice index values in the mentioned cortical areas are higher while doing the “Right minus Left click” contrast than while performing the “Left minus Right click” contrast which is in good agreement with the fact that the volunteers are all right-handed.
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