be more peripheral than previously considered. The presence of an EABR in a congeni- tally deaf infant, coupled with the lack of significant changes in response configuration with age, may confirm the above-mentioned developmental principle. In summary, this study found no relationship between the subjects’ age and EABR wave V latency. EABR thresholds were related to preoperative PTA. Wave V latencies were prolonged in patients with meningitis. Reference Kileny PR, Zwolan TA, Zimmerman-Phillips S, Telian SA (1994) Electrically evoked auditory brain-stem responses in pediatric patients with cochlear implants. Archives of Otolaryngology Head and Neck Surgery 120: 1083–1090. Address correspondence to: Paul R Kileny, Audiology & Electrophysiology, Department of Otolaryngology HNS, University of Michigan Health, 1500 E Medical Center Drive, TC 1904, Ann Arbor, MI 48109-0312, USA. Tel: +1 734 936 8013. Fax: +1 734 763 4006.Email: pkileny@med.umich.edu Objective measurement (NRI) from intracochlear electric stimulation in Clarion CII adult implantees R FILIPO, P MANCINI, C D’ELIA, M BARBARA, Department of Otorhinolaryn- gology, Medical School University ‘La Sapienza’, Rome, Italy Objective Cochlear implant fitting is particularly challenging in congenital and prelingually deafened children. It usually needs multiple careful and thorough sessions in order to better determine the starting level of electrical stimulation for the different speech- coding strategies adopted. In order to facilitate this task, intraoperative electrophysiological testing is most welcome. The advent, in most of the cochlear implant models, of specific software has allowed the measurement of neural action potential (AP) along the cochlear turns crossed by the electrode array (Thai-Van et al., 2001; Frank and Norton, 2001). This study has been designed to offer information regarding the utility of neural AP, when measured on an adult population, in comparison with previously utilized intraoperative tests. Material and methods Twenty-seven adult patients, between 16 and 79 years old (mean 43.4) were recruited for this study. According to the age of deafness they were divided in 20 postlingual, four perilingual and three prelingual. All of them have been implanted with a Clarion CII cochlear implant during the past two years. As far as coding strategy is concerned, 24 patients were using Hi Resolution (HR) and three patients CIS. In all of them, intraop- eratively, the following procedures were carried out after placement of the implant: • X-ray • impedance measurement Electrophysiological measurements and speech-coding strategies 25