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. Author manuscript; available in PMC: 2015 Mar 1.
Published in final edited form as: Hear Res. 2013 Dec 4;309:55–62. doi: 10.1016/j.heares.2013.11.006

Fig. 1.

Fig. 1

SAM tone stimulus waveform and representative AEP responses from a normal hearing chinchilla. The stimulus carrier and modulation frequencies were 1 kHz and 140 Hz, respectively, presented at 52 dB SPL. AEP responses to stimuli of opposite polarity (e.g. second trace from top) were halved and then added to yield the ENV response (third trace) and subtracted to yield the TFS response (fourth trace). The amplitude of the ENV response at fm = 140 Hz was measured from its Fourier transform (bottom panel).