Fig. 4.

MEMRI can distinguish different neuronal responses to a sensory stimulus. Distributions of voxel signal intensities (percentage of all voxels) obtained for neurons (A) B5, (B) B8, and (C) B9 for STIM0 (blue line) and STIM2 (red line). There is no statistically significant difference between the two stimulation conditions for neuron B5. For neurons B8 and B9, the distributions corresponding to STIM0 and STIM2 are statistically different. For neuron B8, the histogram corresponding to STIM2 is shifted to the left compared with STIM0, because it contains more voxels with lower signal intensity, suggesting a decrease in neuronal activity. For neuron B9, the situation is reversed, indicating that neuronal activity increases in the STIM2 vs. STIM0 condition. The data are binned in histograms for visualization purposes, and the K-S tests were performed on unbinned data.