Neurosciences Commons^™

Novel Biomarker Discovery In Multiple Sclerosis, Manisha Gangasani

Honors Theses

Multiple Sclerosis (MS) is a chronic neuroinflammatory disorder affecting the brain, spinal cord, and optic nerve. Patients experience cognitive, motor, autonomic, and emotional symptoms that often overlap with other neurological conditions, making early diagnosis challenging. Current diagnostic criteria require evidence of lesions with dissemination in time and space. Racial disparities in MS outcomes are well documented, with Black individuals often exhibiting greater disease severity, higher relapse rates, and increased disability compared to White individuals. These differences likely reflect a combination of genetic, biological, environmental, and healthcare access factors, underscoring the need to improve early diagnosis and reduce inequities in care. …

An Investigation Of The Roles Aging, Gender And Age-Related Hearing Loss Play In Emotional Prosody Recognition, Giavanna Yowell

Undergraduate Honors Thesis Collection

Emotional prosody recognition is crucial for social interactions but is influenced by aging, gender, and age-related hearing loss (Lambrecht et al., 2012; Oerlemans et al., 2014; Palermo et al., 2013). No past studies have looked at all of these factors collectively. To address this shortcoming, the current study explored the relationships between aging, hearing loss and gender differences in emotional prosody recognition. The ability to recognize emotions through facial expressions was also included as a comparative measure. One hundred fifteen individuals (42 men and 73 women), ages 50 and older (M = 60.39, SD = 8.12), completed a hearing handicap …

Prefrontal Engagement In Cognitive Flexibility Across Paradigms, Katarina Kalajzic

Honors Scholar Theses

Cognitive flexibility is an executive function that involves dynamically adapting behavior in the face of changing environmental circumstances to achieve a particular goal. Disrupted in numerous psychiatric disorders such as Alzheimer’s disease, schizophrenia, OCD, and depression, the neural correlates of cognitive flexibility are not well understood. However, the prefrontal cortex (PFC) is strongly implicated in executive function and attentional control processes. Thus, we sought to examine the neural circuitry involved in distinct cognitive flexibility tasks – the attentional set-shifting task and the probabilistic 2-armed bandit task. Through optogenetic suppression, we targeted pyramidal neurons of the rodent medial prefrontal cortex, an …

Dyadic Agreement In And Task Correlates To A Measurement Of Conversational Success, Samantha Budge

All Graduate Theses and Dissertations, Fall 2023 to Present

Successful conversation matters for social connection, wellbeing, and quality of life, but people do not always agree on whether a conversation was successful, even when they participated in the same interaction. Conversation is also commonly measured through task success, even though it’s unclear how task success correlates to how successful a conversation feels. This study examined how conversational success is experienced by different conversation partners and whether feeling successful in a conversation is related to how well a task is completed.

Participants took part in a structured conversational task and then rated their own conversational experience using a self-report questionnaire …

Targeting The Dorsolateral Prefrontal Cortex With Transcranial Direct Current Stimulation To Improve Depression And Anxiety In Parkinson's Disease, Brock Renicks

Honors Theses

The aim of this study is to observe the outcomes of transcranial direct current stimulation (tDCS) as a treatment for Parkinson’s Disease (PD). This study will primarily look at changes in depression and anxiety, as these symptoms are often comorbid with Parkinson’s Disease. Transcranial direct current stimulation is a non-invasive, very low-intensity form of electrical stimulation of the brain. It is being increasingly used as a form of treatment for Parkinson’s Disease and depression and anxiety, however the literature is ambiguous, showing mixed results throughout various studies, with no standardization of tDCS administration. To determine the effect of tDCS on …

Platelet Gαz Regulates Ovarian Tumor Growth And Mediates The Effects Of Chronic Stress, María G. Torres Carrizalez

Dissertations and Theses (Open Access)

Ovarian cancer is the most aggressive gynecologic cancer, with 12,450 estimated deaths in 2026. Elevated platelet counts are commonly observed in patients with ovarian cancer and are associated with enhanced tumor growth and poor prognosis. Patients with ovarian cancer are frequently exposed to elevated levels of stress, which has been correlated with accelerated disease progression and increased mortality. Interestingly, the platelet Gαz protein is activated by epinephrine through the α2A-adrenergic receptor, suggesting a potential mechanistic link between stress signaling and platelet-driven tumor progression. To investigate this, I evaluated the role of platelet Gαz in ovarian cancer using control (Gz^{fl/fl …}

Circulating Sphingomyelins Correlate With Plasma T-Tau In Cognitively Unimpaired Older Adults At Risk Of Developing Alzheimer's Disease, Tahmida Sharmin, James D. Doecke, Pratishtha Chatterjee, Steve Pedrini, Hamid R. Sohrabi, Nicholas J. Ashton, Henrik Zetterberg, Manohar L. Garg, Kaj Blennow, Ralph N. Martins

Research outputs 2022 to 2026

Alterations in plasma sphingomyelin (SM) levels have been reported in Alzheimer's disease (AD), pointing to disturbances in lipid metabolism that may contribute to disease pathogenesis. Neuronal damage in early AD triggers tau release into central and peripheral systems. Despite influence from peripheral contributions, alterations in plasma total-tau (T-tau) remain valuable in indicating AD-related neurodegeneration. Investigating relationships between SM metabolism and tau release during preclinical AD may uncover important biochemical processes and support advancing early non-invasive detection and treatment approaches. This cross-sectional study investigated cognitively unimpaired (CU) older adults from the KARVIAH cohort, grouped by cortical amyloid-β (Aβ) status through positron …

A High-Throughput Assay For Monitoring And Quantifying Amyloid-Β Accumulation And Clearance In Alzheimer's Disease Cell Models, Ajish Ariyath, Fraulein Denise Arigo, Anna Fyfe, W. M.A.D.Binosha Fernando, Ralph Martins, Prashant Bharadwaj

Research outputs 2022 to 2026

Amyloidogenic proteins, such as amyloid-β (Aβ), self-assemble into cross-β fibrils whose accumulation is central to Alzheimer's disease (AD). Measuring Aβ aggregation and clearance in living cells remains challenging using current cell-based assays, which are often low-throughput or not suited for real-time monitoring. This study aimed to (1) develop a robust, quantitative, and scalable fluorescence-based assay using Amytracker to monitor Aβ accumulation and clearance in an Aβ-producing neuronal cell model, and (2) validate its utility for mechanistic studies and therapeutic screening. We established a plate-based fluorescence assay using Amytracker in MC65 neuronal AD model expressing the Amyloid precursor protein C-terminal fragment …

Predicting Epileptic Seizures From Eeg Signals Using Machine Learning, Hamzah Luqman, Galal M Binmakhashen, Hanan Alali, Marwa Alsleebi, Hamdi A. Al-Jamimi, Motaz Alfarraj, Shahid Bashir, Brent Hedgcock, Ali Mir, Raidah Albaradie

Neurosciences

Objective: To develop a machine learning-based model for predicting epileptic seizures by analyzing electroencephalogram (EEG) signals and classifying the interictal and preictal phases.

Methods: The EEG signals were analyzed in both the time and frequency domains using advanced feature extraction techniques. Three different machine learning approaches were employed, with special focus on long short-term memory (LSTM) networks. Features were extracted and classified to differentiate between seizure and non-seizure phases. The proposed models were evaluated using the publicly available CHB-MIT EEG dataset. The study was conducted between September 2022 and September 2024.

Results: Among the tested models, the LSTM-based approach using …

Epilepsy And Cluster C Personality Disorders: A Saudi Cross-Sectional Study, Mohammed A. Aljaffer, Ahmad H. Almadani, Ayedh H. Alghamdi, Mohammad N. Aljarba, Azzam A. Alotaibi, Mohammed A. Alorayyidh, Abdulaziz M. Alawwad, Rakan S. Alromayan, Faisal M. Alkhunein, Sohaila A. Alshimemeri, Bandar N. Aljafen

Neurosciences

Objective: Epilepsy is a neurological disorder with profound impacts on various aspects of life. It may lead to significant medical and psychiatric comorbidities, one of which is personality disorders (PDs). This study aims to assess the prevalence of Cluster C PDs among adult patients with epilepsy (PWE) at a tertiary care hospital in Riyadh, Saudi Arabia. Method: This cross-sectional study, conducted between January 2024 and April 2025, enroled 360 adult PWE using convenience sampling. The study tool included the Structured Clinical Interview for DSM Disorders criteria, along with additional demographic and epilepsy-related questions developed by the research team. Results: Cluster …

The Role Of The Ventral Tegmental Area In Reward And Addiction: A Comprehensive Review, Emad Ali Albadawi

Neurosciences

The ventral tegmental area (VTA) is a central hub in reward and motivation, integrating heterogeneous neuronal populations and projection-defined circuits to regulate learning, decision-making, and addiction. This review synthesizes anatomical organization and cellular diversity (dopaminergic, GABAergic, and glutamatergic neurons, including multitransmitter co-release), and maps major efferent pathways constituting the mesolimbic and mesocortical systems. We highlight computational roles of VTA activity, including reward prediction errors, incentive salience, and context memory integration, and summarize drug class-specific mechanisms that perturb VTA output. We then outline time-dependent neuroadaptations across mesocorticolimbic networks and discuss therapeutic implications spanning pharmacological, behavioral, and emerging circuit-targeted interventions. Together, these …

Associations Of Regional White Matter Hyperintensities Severity With Different Visual Rating Scales And Domain-Specific Cognitive Impairment, Xiaolu Zheng, Sipei Pan, Yi Man, Zhenghao Shi

Neurosciences

Objective: To explore the association between regional white matter hyperintensities (WMHs) severity and domain-specific cognitive impairment.
Methods: We analyzed 95 WMHs patients retrospectively and evaluated cognitive function. We quantified regional WMHs severity using the Scheltens Rating Scale (SRS) and Cholinergic Pathways Hyper intensities Scale (CHIPS). According to the regional WMHs scores, we divided the patients for intergroup comparisons of WMHs severity with domain-specific cognitive scores via the nonparametric Wilcoxon rank-sum test.
Results: Neither the SRS nor the CHIPS total scores showed statistically correlation with cognitive scores (p > 0.05). However, in the bands lateral ventricles of periventricular hyperintensities …

To Calculate The Nationwide Incidence/Prevalence Figures For Charcot-Marie-Tooth Disease, The Entire Population Must Be Screened, Sinda Zarrouk, Josef Finsterer

Neurosciences

No abstract provided.

Alterations In Gut Microbiota And Their Association With Intestinal Mucosal Injury In Children With Febrile Seizures, Lin Yang, Shuan Yin, Wenchao Zou

Neurosciences

Objective: To explore the correlation between diversity of the gut microbiota and key markers of inflammation and intestinal mucosal injury in pediatric febrile seizures (FS).

Methods: This study compared 15 FS children (FS group) and 15 healthy individuals (normal control group). The participants underwent 16S rDNA sequencing to analyze gut microbiota profiles. ELISA was employed to measure peripheral blood concentrations of the pro-inflammatory cytokines TNF-α and IL-6, as well as intestinal mucosal injury indicators such as endotoxin (BT), D-lactate (D-Lac), and diamine oxidase (DAO). Analysis assessed the correlation between gut microbiota composition, inflammatory factors, and indicators of intestinal mucosal damage …

Timing Matters: Optimizing Oncology Involvement In Pediatric Neuro-Oncology Pathways In Saudi Arabia, Ali H. Algiraigri, Mohammed Basamh, Ghadeer Alobaid, Lama M. Alsulami, Razan A. Almutairi, Zahraa S. Alsultan, Rawan M. Hammad

Neurosciences

Objective: To explore current practices and barriers in pediatric neuro-oncology care coordination, and to identify opportunities to optimize care pathways. Timely coordination between pediatric neurosurgery and oncology is critical for optimal outcomes in children with central nervous system (CNS) tumors. However, in many centers, pediatric oncologists are not involved until after surgery, which contributes to treatment delays and repeated procedures. Methods: A cross-sectional survey was conducted among neurosurgeons and pediatric oncologists in Saudi Arabia. The questionnaire addressed the timing of oncological involvement, neuroimaging practices, cerebrospinal fluid (CSF) cytology collection, and opinions on care coordination solutions. Results: A total of 62 …

Comparison Of Free-Hand Technique And Neuronavigation In Intraventricular Shunt Catheter Placement, Ümit Kocaman, Durmuş O Karakoyun, Emre Çavuşoğlu

Neurosciences

Objective: To compare the accuracy and clinical outcomes of proximal catheter placement using neuronavigation guidance versus the traditional free-hand technique in patients undergoing ventriculoperitoneal shunt (VPS) surgery. Methods: We performed a single-surgeon, before–after cohort study: free-hand cases (2013–2019) and neuronavigation cases (2020–2024). Ethics approval was obtained (İzmir Bakırçay University; Approval No. 2407; 20 Aug 2025). The primary endpoint was a composite of first-attempt ventricular entry and absence of postoperative day-1 (POD1) Grade-3 malposition. Secondary endpoints included grades, 12-month proximal tip dysfunction, and operative duration. Results: Fifty-two patients were included (neuronavigation N = 24; free-hand N = 28). Composite success was …

Science First, Formatting Second: Is It Feasible To Adopt A Free-Format Submission Policy?, Anas Alyazidi

Neurosciences

No abstract provided.

Neuroinflammation At The Crossroads Of Neurodegeneration: The Roles Of Microglia And Astrocytes In Parkinson's Disease, Alzheimer's Disease, And Multiple Sclerosis, Mohannad A. Almikhlafi

Neurosciences

Neuroinflammation plays a critical role in the pathogenesis of neurodegenerative disorders such as Parkinson's disease, Alzheimer's disease, and multiple sclerosis. This review explores the underlying mechanisms of neuroinflammation, with a focus on the roles of microglia, astrocytes, peripheral immune cell infiltration, and cytokine release. The complex interplay between oxidative stress and chronic inflammation accelerates neurodegeneration, contributing to disease progression. Microglial activation, initially protective, becomes harmful when sustained over time, driving chronic inflammation. Similarly, astrocytes once considered passive are now recognized for their active involvement in both inflammatory and neuroprotective responses, depending on their activation state. Prolonged activation of microglia and …

Protein Intake In Children With Cerebral Palsy: A Narrative Review Highlighting The Implications Of Protein Intake On Muscle Mass, Growth, And Overall Nutritional Status, Manar Waleed Simbawa, Sheikha Nasser Alqahtnai

Neurosciences

Children with cerebral palsy experience nutritional challenges that affect protein intake and may contribute to poor muscle mass and growth faltering. Since protein plays a major role in preserving muscle mass and supporting growth, ensuring adequate intake is critical. A comprehensive literature search was conducted for observational studies published between 2006 and 2025. The reviewed studies results were grouped into: [1] Protein intake, with values ranging from 0.66 to 4.1 g/kg/day, with higher intake observed among ambulatory or orally fed children, [2] Nutritional Status and Body Composition, as reduced muscle was reported in children with severe motor impairment, and [3] …

Role Of Bevacizumab In Multiple Glioblastomas: A Retrospective Single-Center Analysis, Yongrui Zhao, Yidong Chen, Leiming Wang, Ye Cheng, Feng Yan, Jiankun Xu

Neurosciences

Objective: To explore the prognostic factors of multiple glioblastomas (M-GBMs) and the role of bevacizumab (BEV) in M-GBMs. Methods: 162 patients treated for primary glioblastoma (GBM) from 2020 to 2024 were retrospectively reviewed. Kaplan–Meier analysis was performed to compare progression-free survival (PFS) and overall survival (OS) between the single glioblastoma (S-GBM) group and the M-GBMs group. Independent predictors of OS among M-GBMs patients were evaluated via multivariable Cox regression analysis. Results: 116 patients had S-GBM, and 46 had M-GBMs. Compared with S-GBM patients, M-GBMs patients had poorer PFS (6.5 vs. 11 months, p<0.001) and OS (15.5 vs. 21 months, p=0.005). In the M-GBMs group, based on the RANO resection criteria, both univariable analysis and multivariable Cox models confirmed that the extent of resection, use of radiotherapy and chemotherapy, p53 overexpression, and use of BEV were all factors that significantly influenced OS. Specifically, the use of BEV prolonged OS from 12 months to 19.5 months (p = 0.017). From the initiation of BEV therapy, the median PFS was 5.5 months (95% CI 4.45–6.56 months), and the median survival was significantly longer than in those who did not received BEV (10 vs. 3 months, p = 0.021). Conclusion: The extent of resection, radiotherapy/chemotherapy, p53 …