Experimental procedure, shown for the noise (NG), silence (SG) and control (CG) groups, along with the number of participants (n).

“Silence” denotes testing with interrupted sentences with silent intervals, and “noise” denotes testing with interrupted sentences that are combined with filler noise bursts. The CG did not receive training; they were only tested with the baseline measurements at two different times, with an in-between time comparable to that of the training duration.