*2.4. Clinical Data*

Clinical data regarding hearing loss (etiology, duration of deprivation, age at implantation) and audiometry data (pure-tone and speech performances with speech reception threshold, SRT and word discrimination score, WDS) before and after implantation were recorded.

Audiometry was performed with a calibrated audiometer (AC40®, Interacoustics Inc., Middelfart, Denmark) in a standard audiometric booth. Preoperative tests were conducted with a headset. Postoperative tests were conducted in free-field conditions with 2 frontal loudspeakers and contralateral masking (headset and white noise). SRT and WDS were evaluated by French Fournier dissyllabic lists. WDS was tested at 60 dBA (SPL).

**Figure 2. Spectrograms of the acoustic input, and electrodograms with standard MPIS and Crystalis xDP for 2 samples from test 3 with the same melody in major and minor modes**. Spectrograms and electrodograms were simulated on Mathlab software using the same algorithms used in the processors by an in-house Oticon Medical program. For electrodograms, vertical axis shows electrode numbers (from 20 at the apex to 1 at the base) and the horizontal axis shows the number of analysis frames for the total duration of the sample (25 s). Each pixel represents an 8 ms frame sliding every 2 ms. Color codes represent pulse width (μs) coding for intensity for electrodograms and power/frequency (dB/Hz) for the spectrograms. Both strategies produced different electrodograms for minor and major modes. Crystalis xDP showed a richer electrodogram with more spectral cues. Differences between minor and major modes were translated by both temporal and spectral differences (i.e., different activation patterns across channels and within channels).
