John M. Deeks
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View article: Effect of Taking a Break From Cochlear-Implant Use for Resolving Facial-Nerve Stimulation: A Case Series
Effect of Taking a Break From Cochlear-Implant Use for Resolving Facial-Nerve Stimulation: A Case Series Open
Objective: To determine if a break from cochlear-implant (CI) stimulation reduces auditory electrical stimulation levels, to manage secondary facial nerve stimulation (FNS). Study design: Retrospective case review. Setting: Multidisciplina…
View article: Measurement of phase-locked neural responses to cochlear-implant stimulation from multiple stages of the auditory system
Measurement of phase-locked neural responses to cochlear-implant stimulation from multiple stages of the auditory system Open
Studies investigating objective measures of auditory perception when using cochlear implants (CIs) differ in the stimuli used and in the neural response measured. The present study aims to disentangle the effects of response type and of st…
View article: Temporal Pitch Perception of Multi-Channel Stimuli by Cochlear-Implant Users
Temporal Pitch Perception of Multi-Channel Stimuli by Cochlear-Implant Users Open
Purpose To explore the feasibility of cochlear-implant (CI) processing strategies that aim to improve pitch perception by presenting information on the stimulus temporal fine structure (TFS) in low-frequency channels to the corresponding a…
View article: Limitations on Temporal Processing by Cochlear Implant Users: A Compilation of Viewpoints
Limitations on Temporal Processing by Cochlear Implant Users: A Compilation of Viewpoints Open
Cochlear implant (CI) users are usually poor at using timing information to detect changes in either pitch or sound location. This deficit occurs even for listeners with good speech perception and even when the speech processor is bypassed…
View article: Temporal pitch perception of multi-channel stimuli by cochlear-implant users
Temporal pitch perception of multi-channel stimuli by cochlear-implant users Open
Some cochlear-implant (CI) processing strategies aim to improve pitch perception by presenting information on the stimulus temporal fine structure (TFS) in low-frequency channels to the corresponding apical electrodes. To explore the feasi…
View article: Measurement of phase-locked neural responses to cochlear-implant stimulation from multiple stages of the auditory system
Measurement of phase-locked neural responses to cochlear-implant stimulation from multiple stages of the auditory system Open
Studies investigating objective measures of auditory perception when using cochlear implants (CIs) differ in the stimuli used and in the neural response measured. The present study aims to disentangle the effects of response type and of st…
View article: Effects of selective stimulation of apical electrodes on temporal pitch perception by cochlear implant recipients
Effects of selective stimulation of apical electrodes on temporal pitch perception by cochlear implant recipients Open
This study investigated whether selective apical stimulation improves temporal pitch perception in eight MED-EL cochlear implant recipients and whether any such improvement relates to auditory-nerve survival. Three stimulation conditions d…
View article: Using Interleaved Stimulation and EEG to Measure Temporal Smoothing and Growth of the Sustained Neural Response to Cochlear-Implant Stimulation
Using Interleaved Stimulation and EEG to Measure Temporal Smoothing and Growth of the Sustained Neural Response to Cochlear-Implant Stimulation Open
Two EEG experiments measured the sustained neural response to amplitude-modulated (AM) high-rate pulse trains presented to a single cochlear-implant (CI) electrode. Stimuli consisted of two interleaved pulse trains with AM rates F1 and F2 …
View article: SpeedCAP: An Efficient Method for Estimating Neural Activation Patterns Using Electrically Evoked Compound Action-Potentials in Cochlear Implant Users
SpeedCAP: An Efficient Method for Estimating Neural Activation Patterns Using Electrically Evoked Compound Action-Potentials in Cochlear Implant Users Open
Objectives: Electrically evoked compound action-potentials (ECAPs) can be recorded using the electrodes in a cochlear implant (CI) and represent the synchronous responses of the electrically stimulated auditory nerve. ECAPs can be obtained…
View article: Modulation depth discrimination by cochlear implant users
Modulation depth discrimination by cochlear implant users Open
Cochlear implants (CIs) convey the amplitude envelope of speech by modulating high-rate pulse-trains. However, not all of the envelope may be necessary to perceive amplitude modulations (AM); the effective envelope depth may be limited by …
View article: The Panoramic ECAP Method: estimating patient-specific patterns of current spread and neural health in cochlear implant users
The Panoramic ECAP Method: estimating patient-specific patterns of current spread and neural health in cochlear implant users Open
The knowledge of patient-specific neural excitation patterns from cochlear implants can provide important information for optimising efficacy and improving speech perception outcomes. The Panoramic ECAP (or ‘PECAP’) method (Cosentino, et a…
View article: Using interleaved stimulation to measure the size and selectivity of the sustained phaselocked neural response to cochlear-implant stimulation
Using interleaved stimulation to measure the size and selectivity of the sustained phaselocked neural response to cochlear-implant stimulation Open
We measured the sustained neural response to electrical stimulation by a cochlear implant(CI). To do so we interleaved two stimuli with frequencies F1 and F2 Hz and recorded a neuraldistortion response (NDR) at F2-F1 Hz. We show that, beca…
View article: The effect of phantom stimulation and pseudomonophasic pulse shapes on pitch perception by cochlear implant listeners
The effect of phantom stimulation and pseudomonophasic pulse shapes on pitch perception by cochlear implant listeners Open
It has been suggested that a specialised high-temporal-acuity brainstem pathway can be activated by stimulating more apically in the cochlea than is achieved by cochlear implants (CIs) when programmed with contemporary clinical settings. M…
View article: A Site-Selection Strategy Based on Polarity Sensitivity for Cochlear Implants: Effects on Spectro-Temporal Resolution and Speech Perception
A Site-Selection Strategy Based on Polarity Sensitivity for Cochlear Implants: Effects on Spectro-Temporal Resolution and Speech Perception Open
Thresholds of asymmetric pulses presented to cochlear implant (CI) listeners depend on polarity in a way that differs across subjects and electrodes. It has been suggested that lower thresholds for cathodic-dominant compared to anodic-domi…
View article: Intraoperative Monitoring of the Cochlear Nerve during Neurofibromatosis Type-2 Vestibular Schwannoma Surgery and Description of a “Test Intracochlear Electrode”
Intraoperative Monitoring of the Cochlear Nerve during Neurofibromatosis Type-2 Vestibular Schwannoma Surgery and Description of a “Test Intracochlear Electrode” Open
Objectives A decision on whether to insert a cochlear implant can be made in neurofibromatosis 2 (NF2) if there is objective evidence of cochlear nerve (CN) function post vestibular schwannoma (VS) excision. We aimed to develop intraoperat…
View article: Effect of Chronic Stimulation and Stimulus Level on Temporal Processing by Cochlear Implant Listeners
Effect of Chronic Stimulation and Stimulus Level on Temporal Processing by Cochlear Implant Listeners Open
A series of experiments investigated potential changes in temporal processing during the months following activation of a cochlear implant (CI) and as a function of stimulus level. Experiment 1 tested patients on the day of implant activat…
View article: Development and validation of a spectro-temporal processing test for cochlear-implant listeners
Development and validation of a spectro-temporal processing test for cochlear-implant listeners Open
Psychophysical tests of spectro-temporal resolution may aid the evaluation of methods for improving hearing by cochlear implant (CI) listeners. Here the STRIPES (Spectro-Temporal Ripple for Investigating Processor EffectivenesS) test is de…
View article: Effects of the relative timing of opposite-polarity pulses on loudness for cochlear implant listeners
Effects of the relative timing of opposite-polarity pulses on loudness for cochlear implant listeners Open
The symmetric biphasic pulses used in contemporary cochlear implants (CIs) consist of both cathodic and anodic currents, which may stimulate different sites on spiral ganglion neurons and, potentially, interact with each other. The effect …
View article: Evaluation of Possible Effects of a Potassium Channel Modulator on Temporal Processing by Cochlear Implant Listeners
Evaluation of Possible Effects of a Potassium Channel Modulator on Temporal Processing by Cochlear Implant Listeners Open
Temporal processing by cochlear implant listeners is degraded and is affected by auditory deprivation. The fast-acting Kv3.1 potassium channel is important for sustained temporally accurate firing and is also susceptible to deprivation, th…
View article: Effect of chronic stimulation and stimulus level on temporal processing by cochlear implant listeners
Effect of chronic stimulation and stimulus level on temporal processing by cochlear implant listeners Open
A series of experiments investigated potential changes in temporal processing during the months following activation of a cochlear implant (CI) and as a function of stimulus level. Experiment 1 tested patients on the day of implant activat…
View article: Effect of Stimulus Polarity on Detection Thresholds in Cochlear Implant Users: Relationships with Average Threshold, Gap Detection, and Rate Discrimination
Effect of Stimulus Polarity on Detection Thresholds in Cochlear Implant Users: Relationships with Average Threshold, Gap Detection, and Rate Discrimination Open
Previous psychophysical and modeling studies suggest that cathodic stimulation by a cochlear implant (CI) may preferentially activate the peripheral processes of the auditory nerve, whereas anodic stimulation may preferentially activate th…
View article: Effect of stimulus polarity on detection thresholds in cochlear implant users: relationships with average threshold, gap detection, and rate discrimination
Effect of stimulus polarity on detection thresholds in cochlear implant users: relationships with average threshold, gap detection, and rate discrimination Open
Previous psychophysical and modelling studies suggest that cathodic stimulation by a cochlear implant (CI) may preferentially activate the peripheral processes of the auditory nerve, whereas anodic stimulation may preferentially activate t…