Graphical illustration of blocks presented in each session. Bars represent individual trials, and the bar height represents the actual vehicle sound power (including the comparably small variability between trials in the same vehicle sound power condition due to e.g., differing speeds). The orange and blue bars indicate trials presenting the higher (audio gain 10 dB) and lower vehicle sound power (audio gain 0 dB), respectively. All participants started with the blockwise vehicle sound power variation. Half of the participants started with the lower sound power and the other half started with the higher sound power. In the second session, the higher and lower sound powers were presented interleaved (trial-to-trial power variation).