摘要 : Objective We sought to validate our proposed tool for estimating channel discrimination of cochlear implant (CI) users along the full electrode array and to assess associations between place-pitch discrimination and speech percept... 展开 Objective We sought to validate our proposed tool for estimating channel discrimination of cochlear implant (CI) users along the full electrode array and to assess associations between place-pitch discrimination and speech perception. Design In two tests, participants identified one stimulus (probe) as the odd-one-out compared with two reference stimuli. Probe stimuli were evoked using dual electrode stimulation characterised by the current steering coefficient alpha. The first test measured psychometric functions (PFs) on pre-defined contacts, with just a noticeable difference (JND alpha) as the outcome variable. The second test estimated channel discrimination on the full electrode array, yielding a discrimination score of D alpha. We measured speech perception as free-field consonant-vowel-consonant phoneme recognition scores. Study sample We included 25 adults with at least 6 months of CI experience. Results JND alpha and D alpha scores measured on the same contact correlated significantly (r(s) = 0.64, p < 0.001). Mean JND alpha and speech perception scores showed significant relationships in quiet and in noise. Conclusions D alpha correlated strongly with JND alpha scores obtained with the PFs. For poor performers, the full-array test may underestimate JND alpha. The full-array pitch discrimination test could be a helpful clinical tool, such as for fitting regions of lesser pitch discrimination ability. 收起