CI Atlas · Print-friendly overview
All modules at a glance
One-page summary of all twelve Objective-Measures modules with level tags, standfirst paragraphs, and the section table-of-contents per module. Use the print button below to generate a portable PDF reference, or click through to the full interactive module pages. The companion /glossary, /references, and /progress pages live separately.
Objective measures are the electrophysiological responses the cochlear implant itself lets us record — no behavioural report required. This module sets out what they are, why they matter across the CI pathway from theatre to the mapping booth, and the F/T/C reader-level scheme used throughout.
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The first number every CI session produces. Impedance telemetry reports the health of each electrode-tissue interface — open and short circuits, the effect of fibrosis and new bone, and what the transimpedance matrix adds about electrode position.
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The electrically-evoked compound action potential — the synchronous firing of the auditory nerve recorded through the implant's own electrodes. How the recording works, and why artifact rejection (forward masking, alternating polarity) is the whole game.
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From a single ECAP to the measures that matter: the ECAP threshold (tNRT/tECAP), the amplitude growth function and its slope, the recovery/refractory function, and spread of excitation along the array.
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The electrical stapedius reflex — an objective upper-bound on comfortable loudness. How it is recorded intra- and post-operatively, its relationship to C/M levels, and its strengths and limits as a fitting anchor.
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The electrically-evoked auditory brainstem response — wave eV and friends. When the auditory nerve and brainstem integrity question outruns what ECAP can answer: ANSD, cochlear nerve deficiency, and ABI candidacy.
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Electrically-evoked cortical auditory responses — the P1-N1-P2 complex and the P1 latency as a biomarker of central auditory maturation in implanted children.
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Recording the cochlea's own acoustically-evoked response through the implant during insertion, to detect trauma and preserve residual hearing. The bridge between this atlas and the ECochG Atlas.
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How objective measures translate into a usable MAP — predicting T and C levels, profile-based fitting, and the special value of objective data when behavioural responses are unreliable, as in young children.
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Where the measures earn their keep: ANSD, malformations, device soft- and hard-failure workup, facial-nerve stimulation, and non-auditory percepts — read through worked cases.
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The same physiology under three different names. A terminology map and feature comparison across Cochlear (AutoNRT / NRT), MED-EL (ART), and Advanced Bionics (NRI), with the defaults and quirks that matter at the chair.
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Interactive infrastructure: amplitude-growth and spread-of-excitation plotters, a tNRT→C-level estimator, an artifact-rejection simulator, plus links to the glossary, references, and progress dashboard.
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