Figure 2.

Experimental stimulation. Left, Example probability distributions used for acoustic stimulation for the two contexts: one with a modal sound level of 15 dB SL and the other with a modal sound level of 45 dB SL. Middle/right, 1400 tones with different sound levels (y-axis) were presented within a 700 s block (x-axis). Each dot reflects the sound level of one tone. Black dots are the stimuli of interest: their level, and the level of the directly preceding tone, were identical across contexts.