Stimulus diagram. A diagram of stimulus parameters that shows two triplets. The length between each triplet was 500 ms, with 125 ms stimulus onset asynchrony (SOA) between each tone. Tones were separated by interaural level difference (ILD). The coloring reflects two possible perceptions of an identical tone sequence. Above, the single stream or grouped percept has all tones as part of the same perceptual object. Below, the two-stream or split percept has tones with different features grouped into different perceptual objects. Two types of tone sequences were presented that were either perceived as left-right-left or right-left-right sequences.