Abstract：
INTRODUCTION:Electrically evoked compound action potentials (TECAP) of the auditory nerve can be recorded in cochlear implants. TECAP thresholds are used to predict threshold levels for speech processor maps. The auditory nerve's refractory properties can influence these levels. METHODS:Recovery functions were investigated at 84 stimulation sites in 14 patients who had Nucleus CI24 implants; neural response telemetry (NRT) and a modified forward-masking technique were used for these investigations, introducing the reference masker-probe interval (MPI). RESULTS AND CONCLUSION:An interval between 300 and 375 micros was found to be suitable as the reference MPI in our study. The median of the absolute refractory period was determined as 390 s and the median time constant of the recovery function, at 425 s. In practice, a reference MPI of 300 s is suggested for measurement of recovery and amplitude growth functions. As up to now the amplitude growth function has been measured at 500 s and thus mostly in a relatively refractory condition, the refractory behaviour should influence the TNRT. In addition, it was possible to explain the shape of standard forward-masking recovery functions with reference to the latency shift of the neural response.
journal_name
HNOjournal_title
HNOauthors
Morsnowski A,Charasse B,Collet L,Killian M,Müller-Deile Jdoi
10.1007/s00106-007-1660-3subject
Has Abstractpub_date
2008-02-01 00:00:00pages
131-8issue
2eissn
0017-6192issn
1433-0458journal_volume
56pub_type
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