FIG. 4.

Average gain changes around transitions. Transitions from step-back to no-step-back (dark) and vice versa (light). In all but one case the gain changes at the 2 transitions differed significantly, with no difference between cases in which the target that stepped back was flickering (1st and 3rd columns), vs. steady (2nd and 4th columns) (*P < 0.01 by one-tailed Tukey–Kramer post hoc test). Note: as indicated in the top left, each ordinate has the same span (0.2) but has a different central value.