Distribution of performance thresholds. CDFs of Te for initial training conditions (A), after whisker trimming (B), and for rats with facial nerve lesions (C) (ROW/ARC–FN) and without any intact whiskers (ROW–C2–NONE). CDFs were binned at 2.5 mm intervals and fitted with a sigmoid Weibull function (solid lines; R2 > 0.98 in all cases). Dotted lines indicate the CDFs of Ts when performance was random at all offsets (for details, see Materials and Methods, Psychophysical thresholds and Fig. 3). All CDFs, except for those of C2, ROW/ARC–FN, and ROW–C2–NONE, were significantly greater than the simulated CDF (p < 0.0001).