Average adaptive tracks showing SNR as a function of trial number, for a starting SNR of 0 dB (top) and −16 dB (bottom) and for diotic (light, yellow) and antiphasic (dark, purple). The trials are numbered such that 1 (marked with a vertical line) corresponds to the first adaptive trial when the first trial is repeated until correct (bottom). The horizontal line shows the average over the last 21 trials.