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5,292 results for “implants”
Data from: Chromium oxide coatings with the potential for eliminating the risk of chromium ion release in orthopaedic implants
Chromium oxide coatings prepared by radiofrequency reactive magnetron sputtering on stainless steel substrates were exposed to Ringer's physiological solution and tested for their electrochemical corrosion stability using an open circuit potential measurement, potentiodynamic polarization, electrochemical impedance spectroscopy and Mott–Schottky analysis. The coatings were found to be predominantly Cr2O3, based on the observation of the dominance of A1gA1g and Eg symmetric modes in our Raman spectroscopic investigation and the Eu vibrational modes in our Fourier transform infrared spectroscopic measurements on the coatings. We investigated for the presence of chromium ions in Ringer's solution after all of the above electrochemical tests using atomic absorption spectroscopy, without finding a trace of chromium ions at the ppm level for coatings tested under open circuit and at the lower potentials implants are likely to experience in the human body. The coatings were further exposed to Ringer's solution for one month and tested for adhesion strength changes, and we found that they retained substantial adhesion to the substrates. We expect this finding to be significant for future orthopaedic implants where chromium ion release is still a major challenge.
Data from: Development of sound localization strategies in children with bilateral cochlear implants
Localizing sounds in our environment is one of the fundamental perceptual abilities that enable humans to communicate, and to remain safe. Because the acoustic cues necessary for computing source locations consist of differences between the two ears in signal intensity and arrival time, sound localization is fairly poor when a single ear is available. In adults who become deaf and are fitted with cochlear implants (CIs) sound localization is known to improve when bilateral CIs (BiCIs) are used compared to when a single CI is used. The aim of the present study was to investigate the emergence of spatial hearing sensitivity in children who use BiCIs, with a particular focus on the development of behavioral localization patterns when stimuli are presented in free-field horizontal acoustic space. A new analysis was implemented to quantify patterns observed in children for mapping acoustic space to a spatially relevant perceptual representation. Children with normal hearing were found to distribute their responses in a manner that demonstrated high spatial sensitivity. In contrast, children with BiCIs tended to classify sound source locations to the left and right; with increased bilateral hearing experience, they developed a perceptual map of space that was better aligned with the acoustic space. The results indicate experience-dependent refinement of spatial hearing skills in children with CIs. Localization strategies appear to undergo transitions from sound source categorization strategies to more fine-grained location identification strategies. This may provide evidence for neural plasticity, with implications for training of spatial hearing ability in CI users.
Data from: Investigation of the effect of cochlear implant electrode length on speech comprehension in quiet and noise compared with the results with users of electro-acoustic-stimulation, a retrospective analysis
Objectives: This investigation evaluated the effect of cochlear implant (CI) electrode length on speech comprehension in quiet and noise and compare the results with those of EAS users. Methods: 91 adults with some degree of residual hearing were implanted with a FLEX20, FLEX24, or FLEX28 electrode. Some subjects were postoperative electric-acoustic-stimulation (EAS) users; the other subjects were in the groups of electric stimulation-only (ES-only). Speech perception was tested in quiet and noise at 3 and 6 months of ES or EAS use. Speech comprehension results were analyzed and correlated to electrode length. Results: While the FLEX20 ES and FLEX24 ES groups were still in their learning phase between the 3 to 6 months interval, the FLEX28 ES group was already reaching a performance plateau at the three months appointment yielding remarkably high test scores. EAS subjects using FLEX20 or FLEX24 electrodes outscored ES-only subjects with the same short electrodes on all 3 tests at each interval, reaching significance with FLEX20 ES and FLEX24 ES subjects on all 3 tests at the 3-months interval and on 2 tests at the 6- months interval. Amongst ES-only subjects at the 3- months interval, FLEX28 ES subjects significantly outscored FLEX20 ES subjects on all 3 tests and the FLEX24 ES subjects on 2 tests. At the-6 months interval, FLEX28 ES subjects still exceeded the other ES-only subjects although the difference did not reach significance. Conclusions: Among ES-only users, the FLEX28 ES users had the best speech comprehension scores, at the 3- months appointment and tendentially at the 6 months appointment. EAS users showed significantly better speech comprehension results compared to ES-only users with the same short electrodes.
The response of silicon carbide composites to He ion implantation and ramifications for use as a fusion reactor structural material
<p>Raw and processed datasets for the publication "The response of silicon carbide composites to He ion implantation and ramifications for use as a fusion reactor structural material".</p>
Scalable Non-Volatile Tuning of Photonic Computational Memories by Automated Silicon Ion Implantation
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Cirq Robotic Module assisted pedicle screw Implantation - Operative video
<p>Cirq Robotic Module assisted pedicle screw Implantation - Operative video</p>
Short- and long-term effects of a cardiac rehabilitation program in patients implanted with a left ventricular assist device: dataset
<p>public anonymized dataset</p>
Perception of speaker sincerity in complex social interactions by cochlear implant users
<p><span>Understanding insincere language, for example sarcasm and teasing, is a fundamental element of communication and crucial for maintaining social relationships. This can be a challenging task for cochlear implant users (CIs) who receive degraded suprasegmental information important for perceiving a speaker's attitude. We measured perception of speaker sincerity (literal positive, literal negative, sarcasm, and teasing) in 16 adults with CIs using an established video inventory. Participants were presented with audio-only and audio-visual social interactions between two people with and without supporting verbal context. They were instructed to describe the content of the conversation and answer whether the speakers meant what they said. Results showed that subjects could not always identify speaker sincerity, even when the content of the conversation was perfectly understood. This deficit was greater for perceiving insincere relative to sincere utterances. Performance improved when additional visual cues or verbal context cues were provided. Subjects who were better at perceiving the content of the interactions in the audio-only condition benefited more from having additional visual cues for judging the speaker's sincerity, suggesting that the two modalities compete for cognitive recourses. Percentage scores for understanding the content also did not correlate with that for extracting speaker sincerity, suggesting that what was said vs. how it was said were perceived using unrelated segmental versus suprasegmental cues. Our results further showed that subjects who had access to lower-order resolved harmonic information provided by a hearing aids in the contralateral ear identified speaker sincerity better than those who used implants alone. The results suggest that measuring speech recognition alone in CI users do not fully describe the outcome and our findings stress the importance of measuring social communication functions in people with CIs.</span></p>
Automatic analysis of cochlear response using electrocochleography signals during cochlear implant surgery
<p>Cochlear implants (CIs) provide an opportunity for the hearing impaired to perceive sound through electrical stimulation of the hearing (cochlear) nerve. However, there is a high risk of losing a patient's natural hearing during CI surgery, which has been shown to reduce speech perception in noisy environments as well as music appreciation. This is a major barrier to the adoption of CIs by the hearing impaired. Electrocochleography (ECochG) has been used to detect intra-operative trauma that may lead to loss of natural hearing. There is early evidence that ECochG can enable early intervention to save natural hearing of the patient. However, detection of trauma by observing changes in the ECochG response is typically carried out by a human expert. Here, we discuss a method of automating the analysis of cochlear responses during CI surgery. We establish, using historical patient data, that the proposed method is highly accurate (~94% and ~95% for sensitivity and specificity respectively) when compared to a human expert. The automation of real-time cochlear response analysis is expected to improve the scalability of ECochG and improve patient safety.</p>
Cyberattacks on Miniature Brain Implants to Disrupt Spontaneous Neural Signaling
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Peri-implant biofilm HiPR-FISH imaging 2024-04-27 and 2024-05-03
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Peri-implant biofilm HiPR-FISH images 2024-04-24 (2)
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Peri-implant biofilm HiPR-FISH images 2024-04-16 and 2024-04-19(1)
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Peri-implant biofilm HiPR-FISH images 2023-10-18
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Peri-implant biofilm HiPR-FISH images 2022-12-16 and 2023-02-08
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Peri-implant biofilm HiPR-FISH images 2023-10-16
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Peri-implant biofilm HiPR-FISH images 2024-02-18
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Figures 1-4 from: Isola TE, Varisco MA, Cazzaniga NJ (2018) Implanted byssal hairs on postlarval shells of Mytilus edulis platensis (Bivalvia: Mytilidae) from Patagonia. Zoologia 35: 1-5. https://doi.org/10.3897/zoologia.35.e21978
Figures 1-4 Postlarvae of Mytilusedulisplatensis: (1) outer view of a postlarva 400 µm long, with an eye spot (ES) and naturally deprived of adventitious hairs; (2) inner view of a postlarval shell; (3) general view of an 850 µm long shell – a marked growth line delimits the prodissoconch II; (4) close up of the umbo of an 850 µm long shell. (LI) Larval ligament, (Pr) provinculum (hinge), (PrT) provincular or primary teeth, (PTI) posterior teeth I. Figures 2–4 are SEM micrographs; the periostracum was previously removed.
Figures 5-8 from: Isola TE, Varisco MA, Cazzaniga NJ (2018) Implanted byssal hairs on postlarval shells of Mytilus edulis platensis (Bivalvia: Mytilidae) from Patagonia. Zoologia 35: 1-5. https://doi.org/10.3897/zoologia.35.e21978
Figures 5-8 Postlarvae of Mytilusedulisplatensis: (5) an 800 µm long postlarva with the "hairy" periostracum; the eye spot is still visible; (6) a 1 mm long postlarva under SEM; (7–8) close up of adventitious hairs (SEM, 300 × and 850 × respectively).
Activation of telecom emitters in silicon upon ion implantation and ns pulsed laser annealing
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.