Comparison of single polarity, added, and subtracted frequency content for FFRs to the 40 ms ‘da’ stimulus. As can be seen in the blue difference line, the single polarity has a larger response than the subtracted response across all frequencies, while compared to the added FFR (black line), it shows similar magnitude responses for the lower frequencies (<400 Hz) and greater response magnitude for the mid frequencies (~500–800 Hz). That the single polarity response has the largest mid-frequency encoding suggests that the mid frequencies can be extracted from both the FFRENV and FFRtfs and that there is not a clear frequency cutoff between ENV and TFS for a complex sound.