Experiment 2, behavioral results.Box plots of reaction time (RT) from correct trials and accuracy of older adults from post-stimulation memory blocks shown across the stimulation conditions of Experiment 2. Relative to sham, frontotemporal inphase theta-tuned stimulation exerted a preferential improvement in task accuracy (t27 = 3.101, p = 0.004, dz = 0.586) without changing RT (t27 = 1.278, p = 0.212, dz = 0.242). Nontuned stimulation had no significant impact on accuracy (t27 = 1.211, p = 0.236, dz = 0.229), or RT (t27 = 0.406, p = 0.688, dz = 0.077), relative to sham. Frontal-alone and temporal-alone stimulation had no significant effect on RT (frontal, t27 = 0.182, p = 0.857, dz = 0.034; temporal, t27 = 0.085, p = 0.933, dz = 0.016) or accuracy (frontal, t27 = 0.323, p = 0.749, dz = 0.061; temporal, t27 = 0.162, p = 0.873, dz = 0.031). Paired sample two-tailed t-tests (n = 28). Box-plot center, median; box limits, lower and upper quartiles; whiskers, lower and upper extreme values. ** p < 0.01.
