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Myoelectric EEG Artifact Removal Validation Using Tripolar Concentric Ring Electrodes and Canonical Correlation Analysis
No full textUnderstanding sensorimotor neural dynamics during human locomotion is a core neuroscience objective, yet there are fundamental challenges to the collection of high-fidelity neuroelectric signals during motion. Mobile, real-world data recordings introduce significant electrical noise that prevents the collection of high-fidelity electrical brain activity during dynamic movements. Our aim was to investigate the effects of novel hardware and signal processing methods for collecting electroencephalography (EEG) brain signals, using an electrical testbed that mimicked the human head. A 60-channel high-density array of tripolar concentric ring electrodes and conventional disk electrodes were used on an electrical testbed to recover simulated brain activity in the presence of electrical muscle artifacts, and canonical correlation analysis was applied to both datasets to test additional noise removal.
An electrical head phantom device was constructed using ballistics gelatin material and anatomically relevant broadcast antenna to accurately model human brain activity and material properties of the human head during simulated locomotion. Simulated brainwave activity consisted of random, time-varying sinusoidal bursts with unique frequency content from within known electrocortical spectral bands. Electrical muscle activity was captured from the neck muscles of a walking human subject and broadcast into the head phantom.
Muscle activity was introduced at varying amplitudes to compare neural source signal recovery from tripolar concentric ring electrodes and conventional disk electrodes, before and after canonical correlation analysis for myoelectric noise removal. By measuring spectral power changes and peaks that matched the ground truth input signals, we identified improved myoelectric artifact removal in tripolar concentric ring electrode recordings compared to conventional electrodes, and additional improvements after canonical correlation analysis signal processing
Contributing Factors, Gaps in Research, and the Complex History of Intrauterine Device Insertion Pain in the United States
Get PDFIntrauterine devices (IUDs) are a form of contraception that boast high efficacy, affordability, and ease of use. However, these devices are considered underutilized in the United States, where contraceptive education and accessibility are a consistent point of public contention due to high rates of unplanned teenage pregnancy. High pain levels experienced by some patients during IUD insertions may deter individuals from pursuing this form of birth control. While IUD efficacy and general safety have been a topic of scientific discourse for decades due to the widespread failures and adverse effects of previous devices, patient experience and discomfort remain overlooked. Research has widely recognized that pre-procedure anxiety and nulliparity heighten insertion pain. However, existing studies on treatments are scarce, irrelevant to modern devices, fail to demonstrate significant reductions in pain, remain unknown or misunderstood, or use samples that are not representative of the population using IUDs today. Additionally, through vague device labeling, widespread stigma, and limited contraception education, clinicians and patients alike are often misinformed about IUD insertion pain and treatments. Off-label usage and regulatory exemptions have allowed this discomfort and pain to go unaddressed. Consequently, the field currently lacks an established standard of care, leading to inequitable and ineffective practices. Evaluating, establishing, and promoting an adequate standard of care could make IUDs more accessible and reduce the occurrence of adverse patient experiences, thus increasing usage, addressing ethical concerns, and lowering rates of unplanned pregnancies
Sometimes Too Hungry to Concentrate: Nontraditional and Traditional First-Generation Students��� Educational Food Practices
Get PDFIn the long-valued narrative of meritocracy in the United States, ���Pulling oneself up by the bootstraps��� is a myth which has been enacted to undermine the structural, even intentional, reality of the inequity between people. In order to situate the structural reality of inequity I focus this research on San Antonio, Texas. I first provide a case study of San Antonio in which I am able to evaluate how genocidal tactics through dispossession has created a classed and racialized inequity of resources. In order to explicate how this inequity is continued I focus this research on higher education. Literature on low rates of educational success of marginalized students tend to focus on how to greater prioritize the role of ���student���. Most literature identifies individualistic methods to increase educational success of marginalized students. To counter this, I apply an intersectional approach to Bourdieu���s theory of practice to investigate how differential hazards and barriers negatively influence food experiences in higher education. I do this by collecting survey data on two different marginalized groups��� (nontraditional and first-generation students) food practices at the higher education institution, Texas A&M University San Antonio.
I use logistic regression to analyze how work effects campus meal skipping while controlling for appropriate variables by student label. I then use logistic regression to identify propensity to use alternative food networks controlling for appropriate variables by student label. From this analysis I illuminate how efforts to obtain food in a field of institutional foodscape, varies by differential barriers and burdens within higher education putting strain on educational access and success. These barriers and burdens are dictated by the individual���s personal and socio-historical interactions with said institution. This navigation is further affected by the interaction of capital; not only to the development of the individual���s habitus but also ability to interact and take full advantage of access and hurdles of said foodscape barriers and burdens
