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Category Archives: sfNIRS2024-Session-1
Fr-094-fNIRS-Based Neural Profile of Teleoperation Skills
The teleoperation conditions affect the operator's performance due to the alteration in his/her workload and mental state. Decoding the neural profile of teleoperation skills might mitigate it. The teleoperation interface could assist the operator based on the decoded profile. This work developed teleoperation experiments of social tasks based on questions and answers during a dyadic interaction between an operator and another individual. The operator's brain activity was recorded by a fNIRS device. Then, fNIRS features and performance metrics of 32 participants were analyzed for neural profiling. We found that the width of hemoglobin oxygenation was greater in the high-performance participants. Continue reading
Fr-065-A broadband NIRS system for bi-hemispheric, multi-distance brain oximetry
We present a new broadband near-infrared spectroscopy system which has four detectors, with multiple source-detector separations, allowing for simultaneous measurement from both cerebral hemispheres along with the use of multi-distance spectroscopy to obtain measurements of absolute tissue oxygen saturation. The platform is optimised for assessment of neonatal hypoxic-ischemic encephalopathy in a clinical environment. Initial results will be presented at the meeting, demonstrating the use of the platform on optical phantoms and adult volunteers. Continue reading
Fr-110-Impact of neurostimulation on performance enhancement in robotic surgery
Robotic surgery has enhanced operation flexibility and patients’ recovery while extending surgeons’ training time over traditional methods at the same time. Although tDCS neurostimulation improves immediate motor behaviour, its impact and long-term retention on cortical dynamics are not understood. fNIRS data was longitudinally collected from a cohort of surgeons during a robotic surgery knot-tying tasks receiving sham vs tDCS neurostimulation. This study applies a GLM to examine differences at the fNIRS data during the pre-, post- and retention sessions. This analysis aims to reveal the mechanism underlying tDCS’s influence on robotics surgical skills and motor learning. Preliminary results suggest tDCS leads to a significant activation in the right hemisphere. Continue reading
Fr-093-The Neural Mechanisms of Order and Content Processing in Phonological Working Memory
Phonological working memory (pWM) entails retaining the identity of the perceived stimuli (i.e., syllables) as well as their sequential order. In this study, 34 Italian adults participated in a complex pWM task, that included three levels of WM load and three conditions: no change, order change, and content change. Their brain activity was recorded using functional near-infrared spectroscopy (fNIRS). The results show distinct neural activity patterns for content and order processing within pWM. They highlight the importance of parietal areas in order processing, especially at a higher WM load. This study opens the door to applying a similar approach to other populations, such as infants. Continue reading
Fr-111-An fNIRS Processing Pipeline Based on Adaptive Thresholding Wavelet Denoising
In this work we present an fNIRS processing pipeline that utilizes BayesShrink based adaptive thresholding in wavelet motion artifact removal. The pipeline is tested on an fNIRS dataset collected from 20 surgical trainees against other methods and achieves significant performance increase (p<0.05) according to both in-group and between group t-test. Continue reading
Fr-105-Finite Element Modelling of Abdominal Near Infrared Spectroscopy for Infant Intestinal Oximetry
Necrotizing enterocolitis (NEC), an inflammatory injury of the intestines, is a major complication affecting newborns with congenital heart disease. Abdominal near-infrared spectroscopy (NIRS) holds promise for the early diagnosis of intestinal ischemia associated with NEC, but the optimal NIRS sensor design for intestinal oximetry is not well defined. Using finite element modeling to simulate abdominal NIRS signals from infants, we computed contrast-to-noise ratio (CNR) as a function of source-detector distance for intestinal oximetry. Intestine CNR was maximal at source-detector distances between 4-5 cm. Sensitivity to intestine tissue also exceeded sensitivity to superficial adipose tissue in the 4-5 cm range. Continue reading
Fr-106-Is there extracerebrovascular CO2 reactivity? A SPA-fNIRS study
We investigated the effect of changes in systemic physiology induced by respiratory tasks on cerebral and extracerebral tissue hemodynamics and oxygenation. We found that both tissue compartments are affected by these tasks, indicating the existence of an extracerebrovascular CO2 reactivity and the need to take this into account when performing and interpreting fNIRS studies. Continue reading
Fr-108-Near-Infrared Spectroscopy Based Cerebral Oximetry Monitoring in Extremely Preterm Infants: Discussion of Two Recent Controversial Clinical Trials (SafeBoosC-II, SafeBoosC-III)
There were two studies on the usefulness of near-infrared spectroscopy based cerebral oximetry (NIRSCO) in extremely preterm infants to prevent death or severe brain injury. The first smaller study showed a borderline significant but large effect. However, the second larger study showed no differences between the NIRSCO and control groups. Our statistical analysis showed that the results of the two studies are significantly different. Possible reasons for this discrepancy are discussed. Continue reading
Fr-087-First Experiences Integrating fNIRS and Virtual Reality
Integrating non-invasive methods of neuroimaging like functional near-infrared spectroscopy (fNIRS) with Virtual Reality (VR) could give researchers an opportunity to collect data in environments that mimic real-world settings, while maintaining a controlled environment for collecting reliable data. In this study, we used fNIRS to investigate the feasibility and reproducibility of recording brain activity during a VR task to assess spatial working memory. Although, brain activity was recorded successfully from four participants, our initial experiences with integrating these technologies highlighted challenges like susceptibility to motion sickness and participants’ experience with VR, which will need to be considered when designing future tasks. Continue reading
Fr-090-Emotion regulation in bipolar disorder: A bimodal EEG-fNIRS study using an emotional Stroop task
This study investigates the impact of emotional dysregulation on cognitive executive function in bipolar disorder (BD) by employing a system coupling electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) during an emotional Stroop task. The ongoing research involves 82 subjects divided into bipolar patients (BP) type I, type II, first-degree relatives, and healthy controls (HC). Preliminary results highlight behavioral differences between BPs and HCs, suggesting the potential interest of combining the event-related potential (ERP) and block-related-hemodynamic answer (BRH) for classification purposes and for deeper investigation into the cognitive functioning of BD. Continue reading