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Modulation spectra of seven sound types in Experiment 2. Power density is indicated by color using a decibel (dB) scale, with red showing the spectrotemporal modulations with the most energy. The x-axis and y-axis represent the frequency of the temporal modulations (ωt or cycles/Hz) and spectral modulations (ωf or Hz) respectively. Black lines in each spectrum are contour lines showing 50–90% of the power.
