Fig 1. Examples of rhythms for each condition.

Each rhythm as used in the experiment is constructed from two of the original 16 grid-point rhythms, followed by a final tone, for a total of 33 grid points. The spacing between the two halves of the rhythm and before the final tone is for viewing purposes only. In the concatenation of the rhythms, the isochronicity of the grid-points was preserved. Note that the number of missing beats and number of accents off the beat refer to counterevidence in a rhythm of 16 grid-points. Sound examples for each condition are available as Supporting Information. S1–S10 Sounds are examples of temporal rhythms from conditions 1–10 respectively, and S11–S20 Sounds are examples of intensity rhythms from conditions 1–10 respectively. B = beat (positions 1, 5, 9, and 13); O = off the beat (positions 2, 4, 6, 8, 10, 12, 14, and 16); (B) = ambiguous (positions 3, 7, 11, and 15; off the beat when subdivided into four beats of four sixteenth notes; on the beat when subdivided into eight beats of two eighth notes).