Feedback probabilities in these new conditions were on average
90.9% (SD 3.82, range 78.3e98.3) and 70.2% (SD 5.24, range
55.0e80.0), and the difference between the conditions ranged from
5% to 38.3% over individuals (no significant difference between age
groups, t(42) ¼ 0.085, p ¼ 0.932).