Experiment 1. Schematic depiction of the temporal fluctuations in sound level / RGB value in the two observation intervals. The gray horizontal lines display the mean level or RGB value of the distribution from which the stimulus components (ten contiguous 117.65-ms Gaussian wideband-noise segments per interval) were drawn in each interval. In this example, the distribution with higher mean (μ_H) is presented in the second observation interval and the distribution with lower mean (μ_L) in the first interval.