Figure 2.

Results of the high resolution 7T finger tapping data set without multiple comparisons correction, using three searchlight radii and the feature weight mapping method. White matter voxels are displayed in false colors (by shifting the color hue by 180°). Hence the blue tones indicate false positivity. Dark blue tones indicate high decoding accuracies or high feature weights. (A) SLD with a radius of 3 mm. Already at this radius, substantial false positivity is visible on the surface of the cortex on the right side. On the left side, out-of-plane false positivity is visible, as searchlights centered in the selected slice pick up information from the slices below or above. (B) SLD with a radius of 5 mm. The levels of false positivity have increased throughout the entire volume. (C) With a radius of 7 mm, the SLD method results in substantially inaccurate depictions of true information content. (D) Feature weight mapping, to enhance the clarity of the representation only the absolute value of the weights is considered here. The highest (absolute) weights are found within gray matter, while the weights found in white matter are on a low level.