Fig 1. (Left) Time waveforms (High-resolution images; gridlines represent milliseconds).

Each six-second sound block (Upper blue representation) consisted of 41 musical interval presentations (42 individual notes) for a particular condition. Each note (Lower blue representation) had a total duration of 128 milliseconds (ms), including 10-ms raised-cosine onset and offset ramps. Notes were separated by 15-ms gaps, producing an overall presentation rate of 7 notes per second. (Right) Spectral representation for a six-second sound block [Matlab, plotted Fourier transform expression fft(x)] belonging to the consonance condition and to the intermediate dissonance condition. Abbreviations: Hz: Hertz.