Measure the medial-olivocochlear reflex (MOCR) with contralateral suppression of TEOAEs or SFOAEs. This is a new module especially for research customers.
Also available for the TE and SF Modules for research users is a contralateral elicitor add-on (MOCR module customers get this add-on for free). The add-on generates digital broad-band noise or a tone, synchronizes the output with the SFOAE measurement (including programmable on and offset delays), and automatically saves the data files with a common file prefix. The benefit to using the add-on is that test sequences can be highly customized, but there is no real-time display of the MOCR results or any data analysis. This add-on is software only - a suitable sound card and calibrated earphone must be purchased or acquired separately.
Marshall, L., Lapsley Miller, J. A., Guinan, J. J., Shera, C. A., Reed, C. M., Perez, Z. D., Delhorne, L. A., and Boege, P. (2014). "Otoacoustic-emission-based medial-olivocochlear reflex assays for humans," J. Acoust. Soc. Am. 136, 2697-2713.