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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: Hear Res. 2019 Aug 8;382:107779. doi: 10.1016/j.heares.2019.107779

Figure 2.

Figure 2.

Comparison of single polarity (black), added (blue), and subtracted (red) FFRs to the evoking stimulus (an E2G3 chord made from triangle waves (gray)) in the time (left) and frequency (right) domains. The frequencies of the stimuli, 99 and 166 Hz (gray dotted lines), are evident in the frequency domain of the subtracted and single polarity responses. However, in the single polarity response and added response, there are also peaks at double the frequencies of the two F0’s (i.e., 198 and 332 Hz, gray dashed arrows) which are the result of half-wave rectification in the extraction of the response envelope. The remaining peaks in the frequency domain are subharmonics and harmonics of the notes.