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Bilateral and bimodal benefit as a function of age for adults.

BACKGROUND
Both bilateral cochlear implants (CIs) and bimodal (electric plus contralateral acoustic) stimulation can provide better speech intelligibility than a single CI. In both cases patients need to combine information from two ears into a single percept. In this paper we ask whether the physiological and psychological processes associated with aging alter the ability of bilateral and bimodal CI patients to combine information across two ears in the service of speech understanding.


MATERIALS
The subjects were 60 adult bilateral CI patients and 91 adult bimodal patients. The test battery was composed of monosyllabic words presented in quiet and the AzBio sentences presented in quiet, at +10 and at +5 dB signal-to-noise ratio (SNR).


METHODS
The subjects were tested in standard audiometric sound booths. Speech and noise were always presented from a single speaker directly in front of the listener.


RESULTS
Age and bilateral or bimodal benefit were not significantly correlated for any test measure.


CONCLUSION
Other factors equal, both bilateral CIs and bimodal CIs can be recommended for elderly patients.