Supplementary Materials

The PDF file includes:

• Methods
• Fig. S1. Effects of postnatal transfection of SGNs in adult Mongolian gerbils using the opsins Chronos and CatCh.
• Fig. S2. SGN density of AAV-injected but CatCh-negative animals.
• Fig. S3. oABRs: Dependence on stimulus intensity, rate, and duration—relationship to fraction of CatCh-expressing SGNs.
• Fig. S4. Amplitude and latency comparison between aABRs and oABRs.
• Fig. S5. Single auditory nerve fiber responses to acoustic click trains.
• Fig. S6. oABR amplitudes and thresholds in chronically implanted gerbils.
• Fig. S7. Determination of fiber position with three-dimensional x-ray tomography.
• Fig. S8. Optical thresholds for AI single units with high versus low BFs.
• Fig. S9. Estimating the spread of excitation using Monte Carlo ray tracing.
• Fig. S10. Shuttlebox location detection algorithm.
• Table S1. Number of animals used for each experiment.
• Legend for table S2
• References (30–48)

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Other Supplementary Material for this manuscript includes the following:

• Table S2 (Microsoft Excel format). Raw data for graphs containing an animal n lower than 20.