A structured ICA-based process for removing auditory evoked potentials

xlomafota13 shared this article with you from Inoreader A structured ICA-based process for removing auditory evoked potentials Via cortical auditory Sci Rep. 2022 Jan 26;12(1):1391. doi: 10.1038/s41598-022-05397-3. ABSTRACT Transcranial magnetic stimulation (TMS)-evoked potentials (TEPs), recorded using electroencephalography (EEG), reflect a combination of TMS-induced cortical activity and multi-sensory responses to TMS. The auditory evoked potential (AEP) is a high-amplitude sensory potential-evoked by the "click" sound produced by every TMS pulse-that can dominate the TEP and obscure observation of other neural components. The AEP is peripherally evoked and therefore should not be stimulation site specific. We address the problem of disentangling the peripherally evoked AEP of the TEP from components evoked by cortical stimulation and ask whether removal of AEP enables more accurate isolation of TEP. We hypothesized that isolation of the AEP using Independent Components Analysis (ICA) would reveal features that are stimulation site specific and unique individual features. In order to i mprove the effectiveness of ICA for removal of AEP from the TEP, and thus more clearly separate the transcranial-evoked and non-specific TMS-modulated potentials, we merged sham and active TMS datasets representing multiple stimulation conditions, removed the resulting AEP component, and evaluated performance across different sham protocols and clinical populations using reduction in Global and Local Mean Field Power (GMFP/LMFP) and cosine similarity analysis. We show that removing AEPs significantly reduced GMFP and LMFP in the post-stimulation TEP (14 to 400 ms), driven by time windows consistent with the N100 and P200 temporal characteristics of AEPs. Cosine similarity analysis supports that removing AEPs reduces TEP similarity between subjects and reduces TEP similarity between stimulation conditions. Similarity is reduced most in a mid-latency window consistent with the N100 time-course, but nevertheless remains high in this time window. Residual TEP in this window has a time-c ourse and topography unique from AEPs, which follow-up exploratory analyses suggest could be a modulation in the alpha band that is not stimulation site specific but is unique to individual subject. We show, using two datasets and two implementations of sham, evidence in cortical topography, TEP time-course, GMFP/LMFP and cosine similarity analyses that this procedure is effective and conservative in removing the AEP from TEP, and may thus better isolate TMS-evoked activity. We show TEP remaining in early, mid and late latencies. The early response is site and subject specific. Later response may be consistent with TMS-modulated alpha activity that is not site specific but is unique to the individual. TEP remaining after removal of AEP is unique and can provide insight into TMS-evoked potentials and other modulated oscillatory dynamics. PMID:35082350 | DOI:10.1038/s41598-022-05397-3 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Modulation Depth Discrimination by Cochlear Implant Users

xlomafota13 shared this article with you from Inoreader Modulation Depth Discrimination by Cochlear Implant Users Via Journal of the Association for Research in Otolaryngology Abstract 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 (AMs); the effective envelope depth may be limited by forward and backward masking from the envelope peaks. Three experiments used modulated pulse trains to measure which portions of the envelope can be effectively processed by CI users as a function of AM frequency. Experiment 1 used a three-interval forced-choice task to test the ability of CI users to discriminate less-modulated pulse trains from a fully modulated standard, without controlling for loudness. The stimuli in experiment 2 were identical, but a two-interval task was used in which participants were required to choose the less-modulated interval, ignoring loudness. Catch trials, in which judgements based on level or modulation depth would give opposing answers, were included. Experiment 3 employed novel stimuli whose modulation envelope could be modified below a variable point in the dynamic range, without changing the loudness of the stimulus. Overall, results showed that substantial portions of the envelope are not accurately encoded by CI users. In experiment 1, where loudness cues were available, participants on average were insensitive to changes in the bottom 30% of their dynamic range. In experiment 2, where loudness was controlled, participants appeared insensitive to changes in the bottom 50% of the dynamic range. In experiment 3, participants were insensitive to changes in the bottom 80% of the dynamic range. We discuss potential reasons for this insensitivity and implications for CI speech-processing strategies. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Comparison of Outcomes of Surgical Repair of Spontaneous Temporal Bone CSF Leaks and Encephaloceles Using Bone Cement and Autologous Material

xlomafota13 shared this article with you from Inoreader Comparison of Outcomes of Surgical Repair of Spontaneous Temporal Bone CSF Leaks and Encephaloceles Using Bone Cement and Autologous Material Via leak of cerebrospinal fluid Otol Neurotol. 2022 Jan 27. doi: 10.1097/MAO.0000000000003467. Online ahead of print. ABSTRACT OBJECTIVE: To compare outcomes transmastoid repair of spontaneous middle fossa cerebrospinal fluid (CSF) leak using only bone cement (BC) versus only autologous material (AM) or combined materials (CM) with both bone cement and autologous material. STUDY DESIGN: Retrospective Chart Review. SETTING: Tertiary Care Hospital. PATIENTS: Forty-three adult patients undergoing transmastoid repair of spontaneous middle fossa CSF leak between 2014 and 2020 (BC:12, AM:15, CR:16). INTERVENTIONS: Cortical mastoidectomy, identification of defect, and repair with BC (Cranios® hydroxyapatite), AM (local bone, fascia, fat, and/or cartilage), or CM (Cranios® combined with autologous materials). MAIN OUTCOME MEASURES: Successful repair without recurrent CSF leak or encephalocele throughout follow up. RESULTS: Fifty-one percent of subjects were female. Mean age at repair was 58.6 years (SD 10.9). Mean BMI was 35.4 (SD 7.6; BC:36.3, AM:36.5, CM:33.6). Forty (93%) patients had successful repair without known recurrent CSF leak or encephalocele since surgery (BC:11, 91.6%; AM:14, 93.3%; CM:15, 93.8%; p = 0.49) over a mean length of follow up of 49.6 months (BC: 37.9, AM: 59.2, CR: 49.5). The difference in mean operative time amongst the groups was faster for patients using bone cement (BC: 100.2 min, AM: 182.8, CM: 133.2; p < 0.00001). CONCLUSIONS: BC, AM, and CM techniques each demonstrate effective and sustained means of repair for middle fossa CSF leak and encephalocele, even in the presence of multiple defects. Use of isolated BC offers a significant decrease in operative time with a noninferior outcome. Active CSF leak at the time of surgery is associated with increased risk of recurrence. PMID:35085113 | DOI:10.1097/MAO.0000000000003467 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Chinese guidelines for diagnosis and treatment of allergic rhinitis (2022, revision)

xlomafota13 shared this article with you from Inoreader Chinese guidelines for diagnosis and treatment of allergic rhinitis (2022, revision) Via Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2022 Jan 21;57:8-31. doi: 10.3760/cma.j.cn115330-20211228-00828. Online ahead of print. NO ABSTRACT PMID:35078291 | DOI:10.3760/cma.j.cn115330-20211228-00828 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Endoscopic Posterior Rotation Flap for Posterior Glottic Insufficiency

xlomafota13 shared this article with you from Inoreader Endoscopic Posterior Rotation Flap for Posterior Glottic Insufficiency Via The Laryngoscope View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Morphology of the ligaments located on the medial side of the ankle and on the plantar surface of the foot

xlomafota13 shared this article with you from Inoreader Morphology of the ligaments located on the medial side of the ankle and on the plantar surface of the foot Via radiol anat Surg Radiol Anat. 2022 Jan 25. doi: 10.1007/s00276-021-02872-w. Online ahead of print. ABSTRACT To have biodynamic features, the feet have bones located in a special posture, the joints that keep together those bones, the ligaments that provide linkage to those joints, and tendons of muscles particularly which end the foot. This study aimed to research the morphology of the medial side and plantar ligaments. The study was conducted on a total of 30 feet belonging to 2 women and 13 men cadavers that exist at the Anatomy Department of the Medical Faculty of Uludag University. After the dissections, 61 parameters that belonging to the ligaments and general features of the foot, were evaluated. The statistical analysis of the collected data was evaluated by SPSS 20.0. According to the findings, while the descriptive statistics of the foot and the ligaments related to the foot, the statistically significant difference of any of the parameters wasn't observed when they were compared between the right and left sides of the foot. In terms of the correlative relations, the parameters that showed high correlation were chosen and 28 formulas were developed using regression analysis. We foresee that our findings of the features belonging to normal anatomic structures will deepen our knowledge besides providing important benefits before or during orthopedic and plastic surgery operations related to the region. Also, our findings were discussed by comparing the find ings of similar studies belonging to many other researchers in literature, and our study's contribution to the literature was evaluated. PMID:35075567 | DOI:10.1007/s00276-021-02872-w View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Effectiveness of submucosal turbinoplasty in refractory obstructive rhinitis: a prospective comparative trial

xlomafota13 shared this article with you from Inoreader Effectiveness of submucosal turbinoplasty in refractory obstructive rhinitis: a prospective comparative trial Via http://link.springer.com/journal/405,European archives of oto-rhino-laryngology,The European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino Eur Arch Otorhinolaryngol. 2022 Jan 25. doi: 10.1007/s00405-022-07267-0. Online ahead of print. ABSTRACT OBJECTIVE: Refractory inferior turbinate hypertrophy requires a surgical approach to address symptomatic complaints. Submucosal approaches demonstrated their efficacy in restoring respiratory function and respecting the nasal mucosa. Microdebrider-assisted turbinoplasty (MAT) tools effectively reduces the soft tissue, exploiting a very different principle from the kinetic energy of radiofrequency. Thus, we aimed to compare the microdebrider-assisted turbinoplasty and the quantum molecular resonance (QMR) to assess patients' perspectives and respiratory outcomes. METHODS: Subjects with persistent bilateral nasal blockage due to inferior turbinates hypertrophy were prospectively recruited from the University Medical Center. We randomly assigned the patients to each treatment and performed symptom evaluation via the visual analog score and endoscopic assessment at baseline and 30-, 90-, and 180-day post-treatment. RESULTS: Seventy participants completed the evaluations, 35 in MAT and 35 in the QMR group. Nasal complaints were significantly reduced after 1 month using both methods. Although the MAT group reported higher postoperative bleeding and edema than QMR group, similar significant reductions were seen for turbinate size at long-term follow-up. Conversely, the MAT group reported greater VAS outcomes than QMR from the first postoperative month. In addition, MAT showed a longer operating time, although this difference was not statistically significant (p < 0.05). CONCLUSION: MAT allows effective control of nasal symptoms by reducing the size of turbinates in patients with lower turbinate hypertrophy. Although QMR may cause fewer postoperative complications, functional results are comparable to long-term follow-up. PMID:35076746 | DOI:10.1007/s00405-022-07267-0 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.