Trends in Cochlear Implants

Zeng, Fan‐Gang

doi:10.1177/108471380400800102

Cited by 329 publications

(256 citation statements)

References 148 publications

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“…These electrodes were developed on a micropatterned polyimide substrate, which was chosen because of its biocompatibility, flexibility and structural properties [27]. The structure (shown in Figure 3) is double sided and has eight evenly spaced recording sites with four sites per side.…”

Section: B Thin-film Lifesmentioning

confidence: 99%

Decoding Information From Neural Signals Recorded Using Intraneural Electrodes: Toward the Development of a Neurocontrolled Hand Prosthesis

et al. 2010

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Abstract-The possibility of controlling dexterous hand prostheses by using a direct connection with the nervous system is particularly interesting for the significant improvement of the quality of life of patients, which can derive from this achievement. Among the various approaches, peripheral nerve based intra fascicular electrodes are excellent neural interface candidates, representing an excellent compromise between high selectivity and relatively low invasiveness. Moreover, this approach has undergone preliminary testing in human volunteers and has shown promises.In this manuscript, we investigated whether the use of intrafascicular electrodes can be used to decode multiple sensory and motor information channels with the aim to develop a finite state algorithm that may be employed to control neuroprostheses and neuro-controlled hand prostheses. The results achieved both in animal and human experiments show that the combination of multiple sites recordings and advanced signal processing techniques (such as wavelet denoising and spike sorting algorithms) can be used to identify both sensory stimuli (in animal models) and motor commands (in a human volunteer). These findings have interesting implications, which should be investigated in future experiments.

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Section: B Thin-film Lifesmentioning

confidence: 99%

Decoding Information From Neural Signals Recorded Using Intraneural Electrodes: Toward the Development of a Neurocontrolled Hand Prosthesis

et al. 2010

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“…The use of qualitative general stimuli such as brushing and stroking, instead of focusing on stimuli to quantitatively characterize single unit responses, was an attempt to generate a more natural data set of responses. The problem is well known in the field of cochlear implants where in early days a single-electrode cochlear implant could only provide some closed-set speech recognition with no open-set recognition at all while now modern devices can provide 70-80% open-set speech recognition (Zeng, 2004).…”

Section: Open Issuesmentioning

confidence: 99%

On the use of wavelet denoising and spike sorting techniques to process electroneurographic signals recorded using intraneural electrodes

Citi

Carpaneto

Yoshida

et al. 2008

Journal of Neuroscience Methods

105

108

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Among the possible interfaces with the peripheral nervous system (PNS), intraneural electrodes represent an interesting solution for their potential advantages such as the possibility of extracting spikes from electroneurographic (ENG) signals. Their use could increase the precision and the amount of information which can be detected with respect to other processing methods.In this study, in order to verify this assumption, thin-film longitudinal intrafascicular electrodes (tfLIFE) were implanted in the sciatic nerve of rabbits. Various sensory stimuli were applied to the hind limb of the animal and the elicited ENG signals were recorded using the tfLIFEs. These signals were processed to determine whether the different types of information can be decoded. Signals were wavelet denoised and spike sorted. Support vector machines were trained to use the spike waveforms found to infer the stimulus applied to the rabbit. This approach was also compared with previously used ENG processing methods.The results indicate that the combination of wavelet denoising and spike sorting techniques can increase the amount of information extractable from ENG signals recorded with intraneural electrodes. This strategy could allow the development of more effective closed-loop neuroprostheses and hybrid bionic systems connecting the human nervous system with artificial devices.

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“…Although speech recognition is remarkably good in most patients with cochlear implants, with average sentence recognition ≥ 80% correct in quiet (see Zeng, 2004 for a review), reduced speech recognition in noise is one of the major problems faced by most implant users. Skinner et al (2002) reported that one third of the 62 postlingually-deafened cochlear implant users tested at a fairly moderate +10 dB signal-to-noise ratio scored below 75% correct in sentence recognition.…”

Section: Introductionmentioning

confidence: 99%

Spectral and temporal cues for speech recognition: Implications for auditory prostheses

Pfingst

2008

Hearing Research

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Features of stimulation important for speech recognition in people with normal hearing and in people using implanted auditory prostheses include spectral information represented by place of stimulation along the tonotopic axis and temporal information represented in low-frequency envelopes of the signal. The relative contributions of these features to speech recognition and their interactions have been studied using vocoder-like simulations of cochlear implant speech processors presented to listeners with normal hearing. In these studies, spectral/place information was manipulated by varying the number of channels and the temporal-envelope information was manipulated by varying the lowpass cutoffs of the envelope extractors. Consonant and vowel recognition in quiet reached plateau at 8 and 12 channels and lowpass cutoff frequencies of 16 Hz and 4 Hz, respectively. Phoneme (especially vowel) recognition in noise required larger numbers of channels. Lexical tone recognition required larger numbers of channels and higher lowpass cutoff frequencies. There was a tradeoff between spectral/place and temporal-envelope requirements. Most current auditory prostheses seem to deliver adequate temporal-envelope information but the number of effective channels is suboptimal, particularly for speech recognition in noise, lexical tone recognition and music perception.

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Trends in Cochlear Implants

Cited by 329 publications

References 148 publications

Decoding Information From Neural Signals Recorded Using Intraneural Electrodes: Toward the Development of a Neurocontrolled Hand Prosthesis

Decoding Information From Neural Signals Recorded Using Intraneural Electrodes: Toward the Development of a Neurocontrolled Hand Prosthesis

On the use of wavelet denoising and spike sorting techniques to process electroneurographic signals recorded using intraneural electrodes

Spectral and temporal cues for speech recognition: Implications for auditory prostheses

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