Experience the fullest, richest range of sounds and perceive speech and music more naturally—all with Triformance. Triformance is the combination of three unique MED-EL technologies that work together to enable you to reach your fullest hearing potential.
Our soft, flexible electrodes designed for structure preservation provide a solid foundation for a more clear and accurate perception of sounds.
To hear the most natural range of sounds, you'll need an implant electrode that's long enough to cover the whole cochlea.
Only FineHearing sound coding technology gives you a richer perception of sound by delivering deep bass tones.
*Fine-structure coding is not indicated for pre-lingual children in the USA.
Hear the Triformance Advantage
Select Music or Voice, then click on the play buttons below to hear the Triformance difference.
Music Dave Brubeck—Take Five
Voice Male Voice
Poor Sound Fidelity
Moderate Sound Fidelity
Cochlea with Electrode
Spectrum of Sound
Music Dave Brubeck - Take Five
Voice Male Voice
These audio samples are designed to help you understand the benefits that Triformance could provide. They are not meant to simulate how a recipient of a MED-EL cochlear implant will hear. Hearing results with cochlear implants vary depending on many factors.
These audio samples are based on the results of several studies with MED-EL recipients.1,2,3,4 The science behind these sound samples is complex, but read on if you'd like an in-depth explanation and want to learn more about how we created these audio simulations.
Our Triformance audio tool is not meant to approximate hearing with a cochlear implant system, but rather, to demonstrate the effects of pitch mismatch on sound quality and how that mismatch can be reduced by Triformance.
In natural hearing, sounds are detected along the whole cochlea. The base of the cochlea (basal region) detects high-pitched sounds, while the tip of the cochlea (apical region) detects low-pitched sounds. A cochlear implant electrode array that is too short to reach the apical region of the cochlea can create a place-pitch mismatch and a distorted perception of sound. This means that a low-pitched sound will sound unnaturally high-pitched. An electrode array that is long enough to extend into the apical region can provide a better pitch match but will still need to employ variable-rate sound coding to ensure the best possible pitch match.1,2,3
In a 2014 study by Prentiss et al., a MED-EL recipient with preserved residual hearing was able to compare the pitch of stimulation through a cochlear implant to the pitch of tones as heard through residual acoustic hearing.4 This study demonstrates that using a short electrode and fixed-rate only sound coding can create a pitch-mismatch. The recipient had a full-length MED-EL electrode array designed for Complete Cochlear Coverage, so pitch perception could be tested on individual electrode contacts along the whole cochlea.
From these results, we can infer that:
When using a short (18-20 mm long) electrode array in combination with fixed-rate sound coding, a 100 Hz tone presented through the cochlear implant system will sound unnaturally high at a pitch of 850 Hz. To demonstrate the effect of this pitch mismatch with a short electrode array and fixed-rate stimulation, all the frequencies of sound in the first sound sample were shifted to 850 Hz and above.
When using a long electrode that provides Complete Cochlear Coverage and fixed-rate sound coding, the 100 Hz tone will sound less unnaturally high at a pitch of 400 Hz. To demonstrate the effect of this pitch mismatch with a full-length electrode array and fixed-rate only stimulation, all the frequencies of sound in the second sound sample were shifted to 400 Hz and above.
When combining both Complete Cochlear Coverage and variable-rate FineHearing sound coding, the 100 Hz tone can be heard as nearly natural at a pitch of 150 Hz. To demonstrate the effect of pitch matching with a full-length electrode array and variable-rate stimulation, all the frequencies of sound in the third sound sample were shifted to 150 Hz and above.
Hochmair, I., Hochmair, E., Nopp, P., Waller, M., & Jolly, C. (2014) Deep electrode insertion and sound coding in cochlear implants. Hearing Research, Advanced online publication. doi: 10.1016/j.heares.2014.10.006
Landsberger, D.M., Mertens, G., Kleine Punte, A., & Van de Heyning, P. (2014). Perceptual changes in place of stimulation with long cochlear implant electrode arrays. J. Acoust. Soc. Am, 135, EL75–EL81. doi: 10.1121/1.4862875
Schatzer, R., Vermeire, K., Visser, D., Krenmayr, A., Kals, M., Voormolen, M., Van de Heyning, P., & Zierhofer, C. (2014). Electric-acoustic pitch comparisons in single-sided-deaf cochlear implant users: Frequency-place functions and rate pitch. Hear Res., 309, 26–35. doi: 10.1016/j.heares.2013.11.003
Prentiss, S., Staecker, H., & Wolford, B. (2014). Ipsilateral acoustic electric pitch matching: A case study of cochlear implantation in an up-sloping hearing loss with preserved hearing across multiple frequencies. Cochlear Implants Int., 15(3), 161–165. doi: 10.1179/1754762814Y.0000000066
The content on this website is for general informational purposes only and should not be taken as medical advice. Please contact your doctor or hearing specialist to learn what type of hearing solution is suitable for your specific needs. Not all products, features, or indications shown are available in all areas.