Tuning curves

Finally, for each set of voxels, tuning curves are computed for each axis-of-motion, by averaging t-values responses of all voxels sharing the same preferred axis-of-motion and evaluating them in the preferred and not preferred conditions. As previously done by (De Martino et al. 2013), a global tuning selectivity index was also computed for each tuning curve, by calculating the ratio of the response for the preferred axis-of-motion divided by the average response towards all other axes of motion.