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2026

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Articles 5491 - 5520 of 12945

Full-Text Articles in Social and Behavioral Sciences

Class Peers As Competitors And Educators: The Consequences Of Rank-Based Academic Rewards, Mark R. Rosenzweig, Bing Xu May 2026

Class Peers As Competitors And Educators: The Consequences Of Rank-Based Academic Rewards, Mark R. Rosenzweig, Bing Xu

Cowles Foundation Discussion Papers

This paper examines the theoretical and empirical consequences of rank-based reward systems in schools in which students’ performance and effort are evaluated relative to their peers. In such environments, classmates act simultaneously as competitors—due to rank-determined rewards—and as educators through peer learning and assistance. Using nationally representative panel survey data from U.S. high schools, combined with administrative information on the location assignments of new refugee student cohorts, we exploit variation in school competition policies and class ability compositions to identify empirically their dual effects on student effort and peer learning. We develop a theoretical tournament model with heterogeneous students who …


Regional Economic Impacts And Emission Responses Under Solar Radiation Modification, Jenny Bjordal, Evelien Van Dijk, Henri Cornec, Anthony A. Smith Jr, Trude Storelvmo May 2026

Regional Economic Impacts And Emission Responses Under Solar Radiation Modification, Jenny Bjordal, Evelien Van Dijk, Henri Cornec, Anthony A. Smith Jr, Trude Storelvmo

Cowles Foundation Discussion Papers

Solar Radiation Modification (SRM) has been proposed as a potential tool to limit increases in global or regional temperatures caused by anthropogenic greenhouse gas emissions. While previous research has extensively examined the climate system’s response to various SRM strategies, as well as their aggregate economic consequences, the regional distribution of economic impacts has received less attention. In this study, we use NorESM2–DIAM—an Earth System Model coupled to a high-resolution integrated assessment model—to assess the economic impacts, measured in GDP per capita, in an idealised SRM scenario where incoming solar radiation is reduced by 1%. Our results suggest that, relative to …


Beyond Exposure: Predicting Ai Adoption Based On Comparative Advantage, Ilse Lindenlaub, Ryungha Oh, Maria Alejandra Rodriguez, Laura Veldkamp May 2026

Beyond Exposure: Predicting Ai Adoption Based On Comparative Advantage, Ilse Lindenlaub, Ryungha Oh, Maria Alejandra Rodriguez, Laura Veldkamp

Cowles Foundation Discussion Papers

We document and explain the gap between measures of AI exposure and measures of AI adoption in the workplace. This leads us to propose a new AI adoption index based on comparative advantage. Using the representative German DiWaBe employee survey linked to worker and establishment information, we compare worker-reported AI use to prominent exposure measures and find that the relationship is weak. Motivated by this gap, we develop a framework in which adoption depends not only on technical feasibility—AI’s absolute advantage measured by exposure—but on profitability—AI’s comparative (dis)advantage relative to a specific worker—balancing AI productivity against AI user costs and …


Towards A Methodology For Measuring Rental Property Ownership In The United States, Stephanie Kestelman, Rebecca Diamond, John Eric Humphries, Kate Pennington, Winnie Van Dijk, John Voorheis May 2026

Towards A Methodology For Measuring Rental Property Ownership In The United States, Stephanie Kestelman, Rebecca Diamond, John Eric Humphries, Kate Pennington, Winnie Van Dijk, John Voorheis

Cowles Foundation Discussion Papers

Roughly one-third of U.S. households rent their homes, yet measuring who owns rental property is difficult: ownership is frequently obscured by LLCs, partnerships, and other intermediary entities that separate legal from economic control. We develop a method that traces ownership through administrative records—combining deeds and property assessments with the Census Bureau’s Business Register, IRS Schedule K-1 filings, and SEC filings on REITs—to identify ultimate owners and construct property portfolios across the full landlord size distribution. Applying the method to 11 large CBSAs, we find that individual landlords own a large majority of rental units, though their share varies meaningfully across …


From People’S War To People’S Rule: Rebel Governance And The Foundations Of Inclusive Democracy, Bhishma Bhusal, Michael Callen, Rohini Pande, Soledad Prillaman, Deepak Singhania, Apurva Subedi May 2026

From People’S War To People’S Rule: Rebel Governance And The Foundations Of Inclusive Democracy, Bhishma Bhusal, Michael Callen, Rohini Pande, Soledad Prillaman, Deepak Singhania, Apurva Subedi

Cowles Foundation Discussion Papers

How does wartime rebel governance shape post-conflict institutions? We study this in Nepal, where the Maoist People's War (1996–2006) dismantled a 240-year caste-based monarchy and ended with Maoists entering democratic politics. During the conflict, Maoists established sub-national “People’s Governments” that administered justice, collected taxes, and delivered local services. Using a spatial regression-discontinuity design, we show that exposure to People's Governments increased political knowledge and participation especially among historically marginalized indigenous groups (Janajatis). Exposure also reshaped party institutions and inter-party competition: candidate-selection committees in more exposed areas have 26 percent more Janajati members who, drawing on novel implicit-attitude data, exhibit less …


Learning Through Imitation: An Experiment, Marina Agranov, Gabriel Lopez-Moctezuma, Philipp Strack, Omer Tamuz May 2026

Learning Through Imitation: An Experiment, Marina Agranov, Gabriel Lopez-Moctezuma, Philipp Strack, Omer Tamuz

Cowles Foundation Discussion Papers

We compare how well agents aggregate information in two repeated social learning environments. In the first setting agents have access to a public data set. In the second they have access to the same data, and also to the past actions of others. Despite the fact that actions contain no additional payoff-relevant information, and despite potential herd behavior, free riding and information overload issues, observing and imitating the actions of others leads agents to take the optimal action more often in the second setting. We also investigate the effect of group size, as well as a setting in which agents …


A Novel Approach To Creativity Assessment: Forced Pairwise Ranking With Large Language Models, Phillip R. Gregory Jr May 2026

A Novel Approach To Creativity Assessment: Forced Pairwise Ranking With Large Language Models, Phillip R. Gregory Jr

Master's Theses

Assessing creativity at scale remains a persistent challenge in cognitive science, as human raters are costly, slow, and often inconsistent in their judgments. This thesis introduced a novel framework for automated scientific creativity assessment using forced pairwise ranking, in which fine-tuned large language models compared response pairs and determined which was more creative. Five empirical studies were conducted using Llama-2-7B and Llama-2-13B models adapted via LoRA fine-tuning and benchmarked against human scored responses from the Scientific Creative Thinking Test. A regression baseline achieved Pearson �� = .74 on the test set, matching the human inter-rater ceiling reported in the literature. …


Equity, Diversity, And Inclusion Infrastructures And Faculty Composition: Associations With Undergraduate Student Outcomes At R1 Universities 2011-2021, Niyonta Nahia Chowdhury May 2026

Equity, Diversity, And Inclusion Infrastructures And Faculty Composition: Associations With Undergraduate Student Outcomes At R1 Universities 2011-2021, Niyonta Nahia Chowdhury

All Graduate Theses and Dissertations, Fall 2023 to Present

This study explores how the structure and composition of research universities relate to student outcomes. Specifically, it asks whether having visible Equity, Diversity, and Inclusion (EDI) infrastructures and diverse faculty representation is associated with who enrolls, who graduates, and how graduation rates differ within racial groups at R1 universities in the United States. Using national data from 2011 to 2021, the project analyzes enrollment and graduation patterns across institutions while accounting for differences in geography, governance, and state political context.

Rather than focusing on individual students, the study looks at institutional patterns. It examines how the racial and gender makeup …


Beyond The Straight Road: A Narrative Of Growth Toward Integrated Social Work Practice, Samantha Bymaster May 2026

Beyond The Straight Road: A Narrative Of Growth Toward Integrated Social Work Practice, Samantha Bymaster

Graduate Student Portfolios, Professional Papers, and Capstone Projects

No abstract provided.


Building Collaborative Capacity For Coexistence With The Montana Beaver Working Group, Shane Randle May 2026

Building Collaborative Capacity For Coexistence With The Montana Beaver Working Group, Shane Randle

Graduate Student Portfolios, Professional Papers, and Capstone Projects

Despite beavers’ recent surge in popularity, prevailing negative attitudes and the persistence of beaver removal practices remain obstacles for those advocating living with beavers. The Montana Beaver Working Group (BWG) advances beavers’ role in ecological and community resilience through members’ collaborative efforts, including beaver-related restoration and conflict resolution projects. Bringing together people with diverse values and perspectives, the BWG builds collective understanding, develops a holistic vision for beavers in Montana, and supports members in pursuing it. As the group’s impacts and membership have grown, so too has their need to adapt. For my Civic Engagement Project, I strengthened the BWG’s …


Msw Portfolio: Advancing Social Work Practice In International And Marginalized Communities, Emily L. Curtis May 2026

Msw Portfolio: Advancing Social Work Practice In International And Marginalized Communities, Emily L. Curtis

Graduate Student Portfolios, Professional Papers, and Capstone Projects

My portfolio presents an integrated reflection of advanced social work practice developed through my academic training and immersive field experiences across the United States, Germany, and New Zealand. Grounded in trauma-informed care, cultural humility, and strengths-based approaches, it demonstrates my application of the ten core social work competencies and five elements of advanced integrated practice within diverse and marginalized communities.

Drawing on my work with Māori and Pasifika women, refugee populations, and rural communities, this portfolio explains the importance of understanding individuals within broader cultural, historical, and systemic contexts. It emphasizes the need for socially just, culturally responsive, and relationship-centered …


An Exploration Of Personal Grievances And Susceptibility To Terrorist Recruitment Among Aggrieved U.S. Military Members: A Scenario-Based Qualitative Study, Jose R. Munoz May 2026

An Exploration Of Personal Grievances And Susceptibility To Terrorist Recruitment Among Aggrieved U.S. Military Members: A Scenario-Based Qualitative Study, Jose R. Munoz

Electronic Theses, Projects, and Dissertations

This qualitative study examined how personal, relational, and institutional experiences influenced susceptibility to terrorist recruitment among aggrieved U.S. military members. Using a scenario-based interview design grounded in the Terrorist Radicalization Assessment Protocol-18 (TRAP-18), twenty current and former service members participated in standardized, one-on-one interviews. The study aimed to identify patterns of vulnerability and resilience that emerge from experiences of marginalization, isolation, emotional distress, and moral conflict within military contexts. A deductive analytic approach combined TRAP-18 indicators with Braun and Clarke’s thematic analysis to interpret how participants conceptualized grievance, belonging, and institutional trust.

Findings revealed that radicalization susceptibility does not emerge …


Transition From Group Homes To Short-Term Residential Therapeutic Programs: A Qualitative Study, Sam Alexander Skipper May 2026

Transition From Group Homes To Short-Term Residential Therapeutic Programs: A Qualitative Study, Sam Alexander Skipper

Electronic Theses, Projects, and Dissertations

This study examines California’s shift from traditional group homes to Short-Term Residential Therapeutic Programs (STRTPs), a central component of the state’s Continuum of Care Reform (CCR). STRTPs were introduced to provide intensive, trauma-informed treatment for youth with complex behavioral and mental health needs. While the policy goals behind this reform are well-intended, less is understood about how the transition has affected young people’s lived experiences and longer-term outcomes. Using a qualitative design grounded in Transition Theory, this research centers on the perspectives of young adults ages 18–25 who moved into an STRTP within the past six to twenty-four months. This …


Latino Men’S Experience Of Dui Conviction In Imperial County: A Narrative Theory Approach, Jhonathan Fajardo May 2026

Latino Men’S Experience Of Dui Conviction In Imperial County: A Narrative Theory Approach, Jhonathan Fajardo

Electronic Theses, Projects, and Dissertations

According to California Department of Justice data, Latino drivers accounted for the largest share of any racial or ethnic group for Driving Under the Influence (DUI) arrests. Latino men are disproportionately affected by DUI arrests and alcohol-related harms in California, yet little is known about how they themselves understand and navigate life after a DUI. This study examines Latino men’s narratives of life before, during, and after a DUI conviction. Prior scholarship has largely relied on quantitative data to show that Latino men are overrepresented in DUI statistics. What remains underexplored are Latino men’s first-person, culturally grounded narratives of what …


Evaluating Social Work Intervention Effectiveness Among Veterans Seeking Ptsd Treatment, Ashlyn Gaines May 2026

Evaluating Social Work Intervention Effectiveness Among Veterans Seeking Ptsd Treatment, Ashlyn Gaines

Electronic Theses, Projects, and Dissertations

This proposed study will examine how social work interventions are associated with PTSD symptom severity and treatment engagement among veterans. Veterans frequently experience ongoing psychological distress, and inconsistent engagement in treatment remains a significant concern for social work practice. Understanding whether specific social work interventions are linked to reduced PTSD symptoms and improved treatment participation will contribute to strengthening evidence-informed services. A quantitative, descriptive, and correlational proposed research design will be used to survey veterans regarding their treatment experiences and symptom levels. Data would be analyzed using descriptive statistics, bivariate tests, and multiple regression analyses to determine relationships between interventions …


Task-Dependent Modulation Of The N170 Erp Component In Facial Perception, Mary M. Krdikashyan May 2026

Task-Dependent Modulation Of The N170 Erp Component In Facial Perception, Mary M. Krdikashyan

Electronic Theses, Projects, and Dissertations

The N170 component plays a key role in face perception, but how attention influences it remains debated. In a series of five electroencephalography (EEG) experiments, we examined how attention to different facial features (holistic versus feature-based) affects the N170 amplitude. This study aims to determine whether perceptual competition explains these effects. In a preliminary study (Experiment 1), participants were primed to focus on either gender, age, emotional expression, race, or no specific task. This study showed a larger amplitude for gender and age, followed by emotion, with minimal differences for race, and no task was assigned. Since all these conditions …


The Relationship Between Telecommuting, Autonomy, And Burnout, Aniko Nagy May 2026

The Relationship Between Telecommuting, Autonomy, And Burnout, Aniko Nagy

Electronic Theses, Projects, and Dissertations

With flexible work arrangements becoming more common, the need to expand our understanding of the relationships between flexible work arrangements and employee health and wellbeing outcomes, such as employee burnout, continues to grow. The purpose of the present study is to explore the relationships between flexible work arrangements, autonomy, and employee burnout. The Job Demands-Resource (Bakker and Demerouti, 2007) and Conservation of Resources (Hobfall & Freedy, 2017) theories propose that job resources such as flextime, flexplace, and job autonomy are vital, and that the loss of or failure to acquire job resources can lead to stress and burnout. The Self …


Factors Contributing To The Effectiveness Of Reentry Programs For Formerly Incarcerated Adults, William Lopez Jr, Falina Rose Gonzales May 2026

Factors Contributing To The Effectiveness Of Reentry Programs For Formerly Incarcerated Adults, William Lopez Jr, Falina Rose Gonzales

Electronic Theses, Projects, and Dissertations

Reentry into society following incarceration represents a critical transition that significantly influences long-term stability and recidivism outcomes. Formerly incarcerated adults frequently encounter structural barriers related to housing, employment, behavioral health access, and social reintegration, highlighting the need for effective reentry programming. The purpose of this qualitative study is to examine factors that contribute to the effectiveness of community-based reentry programs for formerly incarcerated adults and to understand how participants and service providers perceive successful reintegration outcomes. Guided by ecological systems theory and empowerment theory, this study employs a qualitative phenomenological design using semi-structured interviews with approximately 15 formerly incarcerated adults …


Serotonin 7 Receptor Modulation On Measures Of Working Memory And Anxiety, Antonio Gutierrez May 2026

Serotonin 7 Receptor Modulation On Measures Of Working Memory And Anxiety, Antonio Gutierrez

Electronic Theses, Projects, and Dissertations

Serotonin (5-HT) function is critical in the regulation and homeostasis of several neural systems. Alterations in 5-HT levels can directly impact the presence of neuropsychiatric disorders such as schizophrenia. With a wide range of 5-HT receptors, the potential impact each of these modulators have on behavior is important to better understand. The 5-HT7 receptor is the most recently identified 5-HT receptor. 5-HT7 receptors can be found in the thalamus, hypothalamus, and several areas of the hippocampus. Modulation of these receptors impact circadian rhythms, hormonal regulation and memory function. Previous research has that 5-HT7 antagonist compounds lead to conflicting results, highlighting …


Interrupting Intergenerational Trauma, Teresa Iribe-Arroyo, Demiana Adel Shenouda May 2026

Interrupting Intergenerational Trauma, Teresa Iribe-Arroyo, Demiana Adel Shenouda

Electronic Theses, Projects, and Dissertations

Adverse childhood experiences (ACEs) are traumatic events that occur during childhood, the ages of 0 and 17. Many individuals may have experienced ACEs without fully recognizing how these early experiences continue to affect their daily lives. These inhibitors can include mental health struggles, physical health problems, academic and behavioral functioning. In contrast, Positive Childhood Experiences (PCEs) can serve as protective factors, helping to buffer against some of the negative outcomes associated with childhood trauma. This proposed study seeks to better understand how both ACEs and PCEs shape individuals into adulthood, particularly in their roles as parents.

This proposed research would …


Raising Resilient Children: Parent Video Guide To Support Children’S Emotional Development, Perla F. Nunez-Chavez May 2026

Raising Resilient Children: Parent Video Guide To Support Children’S Emotional Development, Perla F. Nunez-Chavez

Electronic Theses, Projects, and Dissertations

Social-emotional learning (SEL) in early childhood plays a critical role in

children’s ability to recognize emotions, regulate behavior, build relationships,

and succeed in academic settings. During the preschool years (ages 3–5),

children experience rapid emotional development and rely heavily on parents for

co-regulation, emotional modeling, and guidance. Research consistently shows

that when parents engage in emotion coaching practices, such as labeling

feelings, validating emotions, and modeling regulation strategies, children

demonstrate stronger emotional competence and improved developmental

outcomes. However, despite strong evidence supporting parent involvement in

SEL, many existing interventions are delivered through structured, in-person

programs that are often inaccessible to …


Effects Of Western Beauty Ideals In Social Media On Latina Women's Body Image, Angel S. Espinosa, Lizette Casillas-Rodriguez, Dalia Osorio May 2026

Effects Of Western Beauty Ideals In Social Media On Latina Women's Body Image, Angel S. Espinosa, Lizette Casillas-Rodriguez, Dalia Osorio

Electronic Theses, Projects, and Dissertations

The proposed study would utilize a quantitative design to examine the relationship between social media use and body dissatisfaction among Latina college students from ages 18-25. The purpose is to investigate the correlation between social media engagement and body dissatisfaction with particular attention to the impact of Westernized beauty standards on Latina women.

Data will be collected through an online Qualtrics survey utilizing standardized measures of appearance-related social media behaviors. On a micro level, results may inform culturally responsive clinical interventions. At a mezzo level, findings may support the development of community-based support groups and prevention programs for Latina communities. …


Self-Care At The Organizational Level, Rosa Gallegos-Valades, Viviana Hummel May 2026

Self-Care At The Organizational Level, Rosa Gallegos-Valades, Viviana Hummel

Electronic Theses, Projects, and Dissertations

Self-care in the social work profession is commonly framed as an individual responsibility; however, organizational environments play a critical role in shaping workers’ ability to engage in sustainable self-care practices. This study will focus on understanding how workplace environments influence professional self-care among social workers. Much of the existing literature emphasizes personal coping strategies while overlooking structural and organizational supports that enable or constrain self-care. Previous research has largely failed to address the importance of professional self-care at the organizational level, which can unintentionally place responsibility solely on individuals and contribute to feelings of inadequacy when self-care is difficult to …


Face Representations In The Fusiform Face Area, Krisha Orgo May 2026

Face Representations In The Fusiform Face Area, Krisha Orgo

Electronic Theses, Projects, and Dissertations

Faces are among the most socially significant stimuli humans encounter, requiring recognition not just at the category level but at the level of individual identity. While the fusiform face area has been established as a dedicated region for face processing, whether it encodes distinct representations for different individuals or simply detects the presence of a face remains an open question. Evidence for identity-specific coding in the brain has come primarily from invasive single-neuron recordings in epilepsy patients, leaving open whether the same principles govern face processing in healthy populations. The present study addressed this gap using scalp electroencephalography to examine …


The Effects Of Lgbtq+ Inclusive Education On High School Students, Cristal Dirzo, Lizzette A. Padilla May 2026

The Effects Of Lgbtq+ Inclusive Education On High School Students, Cristal Dirzo, Lizzette A. Padilla

Electronic Theses, Projects, and Dissertations

Many schools across the United States exclude LGBTQ+ topics from required curriculum, which limits a student’s understanding of diverse identities and underrepresents marginalized communities in the world. The absence of LGBTQ+ topics in education may impact levels of inclusivity within school culture as well as student attitudes towards LGBTQ+ individuals. While past research has focused on teacher perspectives and barriers to implementing LGBTQ+ topics in classrooms, little research has explored the student outcomes and perspectives on how LGBTQ+ inclusive curriculum influences their attitudes and perceptions of inclusivity within school culture. This study examines how LGBTQ+ inclusive education affects 9th-grade high …


Game On! Level Up Your Teaching: A Digital Game-Based Learning Guide For Preschool Teachers, Scarlett Flores Marin May 2026

Game On! Level Up Your Teaching: A Digital Game-Based Learning Guide For Preschool Teachers, Scarlett Flores Marin

Electronic Theses, Projects, and Dissertations

Although digital game-based learning (DGBL) has emerged as a

promising technological advancement in early childhood education by offering

many developmental benefits for children, its effective implementation remains a

challenge. The integration of digital technologies in early childhood education has

led to the growing use of DGBL as an effective instructional approach with

research indicating that well-designed educational apps and games can enhance

young children’s cognitive, literacy, and social development by promoting active,

meaningful, and interactive learning experiences. DGBL encourages problem-

solving, critical thinking, and collaboration, aligning with how children naturally

learn through exploration and engagement. When used intentionally, technology

and …


Social Media’S Impact On School-Aged Children's Mental Symptoms, Tiffany Espinoza May 2026

Social Media’S Impact On School-Aged Children's Mental Symptoms, Tiffany Espinoza

Electronic Theses, Projects, and Dissertations

With the increased usage of social media among individuals, this has raised concerns about its impact on the mental health symptoms of the younger population. Previous research has shown the impact of social media on adolescents' depression and anxiety; however, there is limited research showing the impact on younger school-aged children. The purpose of this study will be to examine the relationship between social media use and mental health symptoms among school-aged children from kindergarten through twelfth grade. The proposed research study will seek to address gaps in previous research by analyzing a wider age range and more diverse subgroups …


Centering Lgbtqia2s+ Voices: A Proposed Needs Assessment Of Unhoused Adults In California’S Inland Empire, Karina L. Martinez, Sade D. De La Espriella May 2026

Centering Lgbtqia2s+ Voices: A Proposed Needs Assessment Of Unhoused Adults In California’S Inland Empire, Karina L. Martinez, Sade D. De La Espriella

Electronic Theses, Projects, and Dissertations

LGBTQIA2S+ homelessness remains a critical yet underexamined issue within California’s Inland Empire. While existing research has documented elevated rates of homelessness among LGBTQ+ populations in major urban centers, particularly among transition-age youth (TAY), there is limited understanding of the specific service needs of unhoused LGBTQIA2S+ adults, including older adults, within this region. This research proposal outlines a community-based needs assessment designed to address this gap. The proposed study will utilize trauma-informed, fully structured interviews with standardized, closed-ended questions administered to LGBTQIA2S+ adults who are currently experiencing or have recently experienced homelessness across the Inland Empire. The instrument will assess barriers …


Effectiveness Of Independent Living Programs On Preparing Transition-Age Foster Youth For Higher Education And Employment., Naomi Cailipan, Jasmine Nevarez, Emily Matias May 2026

Effectiveness Of Independent Living Programs On Preparing Transition-Age Foster Youth For Higher Education And Employment., Naomi Cailipan, Jasmine Nevarez, Emily Matias

Electronic Theses, Projects, and Dissertations

Transition-age foster youth face significant barriers to higher education and stable employment, increasing their risk of housing instability, unemployment, and long-term economic hardship. Independent living programs (ILPs) aim to support the youth develop life skills and connect them to resources that prepare them for a successful transition into adulthood, however, there is limited research that explores the youth’s perspective on the effectiveness of ILPs. This study seeks to provide insight by interviewing current and former foster youth who participated in an ILP by conducting combined research, integrating both quantitative and qualitative approaches. Quantitative data will be collected through a Likert-scale …


Investigating Fentanyl-Xylazine Interactions: Implications For Opioid-Induced Hyperalgesia And Affective Dysregulation In Rats, Alejandra R. Lujan May 2026

Investigating Fentanyl-Xylazine Interactions: Implications For Opioid-Induced Hyperalgesia And Affective Dysregulation In Rats, Alejandra R. Lujan

Electronic Theses, Projects, and Dissertations

The growing prevalence of fentanyl adulterated with xylazine presents a major public health concern, yet the behavioral and physiological effects of this combination remain poorly characterized. This study examined the effects of acute fentanyl administration, alone and in combination with xylazine, on opioid-induced hyperalgesia, affective behavior, and mortality in male and female Sprague-Dawley rats (n=80). Rats received four fentanyl injections (60 µg/kg) administered at 15-minute intervals, with or without xylazine (0, 0.1, 0.333, or 1.0 mg/kg), as well as a saline control condition. Pain sensitivity was assessed using a hot plate assay at 6.5, 12, 24, and 48 hours post-injection. …