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Scholarly Work

This page goes through my publications and presentations as well as ongoing work. Check out the projects, writing, presentations, upcoming events, and my github! 

I am doing some maintenance on my Github and the link will be back soon.

Current and Past Projects

Emma presenting a poster at a conference. Emma is wearing a black jacket and a floral tie.
Stochastic Actor-Oriented Models of Brain Network change

This project explores the changes in functional and structural brain networks in aging by applying the Stochastic Actor-Oriented Model to longitudinal brain networks. I designed and executed this project as a part of my master's thesis project under the supervision of Dr. Javier Orlandi and Dr. Roberto Sotero Diaz. This project has lead to a thesis which will be submitted in the next month and a paper which will hopefully be published next year. I have also numerous opportunities to present on this project at various stages.

A photo from the perspective of Emma sitting on the floor of the aisles of a library. The shelves are full of books and you can see her black lace up boots.
Comparability, Parity, Synergy - Philosophy of Interdisciplinary Science

This project explores the incommensurability between scientific disciplines and the challenges of interdisciplinary research. I designed and executed this project for my undergraduate honors thesis under the supervision of Dr. Michael Stoltzner and Dr. Thomas Vogt. This project has contributed to an undergraduate honors thesis which is published and submitted on the University of South Carolina thesis database. I am looking to expand this work into a broader publishable text in the next year. I have also had the opportunity to present on this topic recently for the Mind and Matter philosophy series at the University of Calgary.

A photo of Emma doing archery in the mountains. She is wearing a blue tank top with a flanel tied around her waist.
The Vector of Science

This project explored how different philosophies and views of scientific research indicate the future patterns of scientific practice. I designed this project for my undergraduate thesis project under the supervision of Dr. Michael Strotzner and Dr. Thomas Vogt. This project contributed to my undergraduate honors thesis which is submitted and published on the University of South Carolina thesis database.

A sagittal image of a brain with a particular region highlighted in blue. The region is in the frontal lobe.
structural effects of aphasia in the brain

This project studied the structural effects of aphasia after a stroke by mapping and analyzing lesions. I contributed to Dr. Rutvik Desai's project by doing data analysis and exploration as an undergraduate research assistant.

An image of the results of an optical experiement using three different colored lasers in red, green, and blue.
piezoelectric optical materials 

This project explored the piezoelectric and optical properties of materials. I contributed to Dr. Yanwen Wu's project by designing mechanisms and procedures to create and test materials as an undergraduate research assistant.

An MRI sequence timing diagram. Labels for TR and TE are visibile as well as rectangular distruptions to lines representing changes to the magnetic field for spatial encoding.
fMRI and DTI Data Preprocessing

This project encompasses the compilation of materials and knowledge surrounding MRI preprocessing including fMRI and DTI. I compiled many resources for this project to create a guide for future students at the University of Calgary who may wish to work on MRI data (and for myself). This project contributed to my master's thesis and produced a sharable guide of materials.

An image of the wave form of an audio file in blue.
Stimuli and Experiments For The Aging brain cohort

This project involved the creation of stimuli and experimental materials for a large scale study of language in aging brains. I contributed to Dr. Rutvik Desai's project by recording and editing stories, collecting data on language associations, and other tasks as a undergraduate research assistant.

Logo: a minimalist fox.

Writing

[IN PROGRESS] Garrison, E. K., Sotero Diaz, R., and Orlandi, J. G. (2026). Identifying Network Factors Driving Changes in Brain Connectivity During Aging via Stochastic Actor-Oriented Models.

In this work, we develop a new data-driven procedure to estimate the network factors driving longitudinal changes in structural and functional brain networks during aging. Our method builds on the Stochastic Actor-Oriented Model framework, originally developed to study changes in social networks from a node-centric perspective. Applied to the Alzheimer's Disease Neuroimaging Initiative dataset, our approach highlights that cognitive impairment during aging affects the ability of functional networks to regulate their modularity and efficiency demands.

[PENDING] Garrison, E. K. (2025). Stochastic Actor-Oriented Models of Functional and Structural Brain Network Change in Aging. [Master's Thesis]

The human brain is a complex and dynamical system that changes throughout the lifetime. Non-invasive imaging techniques, including magnetic resonance imaging (MRI), allow for the measurement of large-scale functional and structural connectivity networks in the brain. Beyond trends, the dynamics across long timescales are still poorly understood. Our research aims to address the question of these long-term dynamics by carefully adapting and applying the stochastic actor-oriented model to brain networks derived from MRI data, specifically in an aging population. The resulting models of network change suggest that the brain is promoting modularity, local efficiency, and short-range connectivity with more adaptive functional networks compared to structural networks. Differences between individuals with and without cognitive impairment suggest a disruption in the maintenance of key brain topology in the progression of cognitive impairment with age. These results are modulated by subnetwork and sex differences that contribute further to the emerging picture of long-term dynamics in aging.

Garrison, E. K. (2021). The Vector of Scientific Disciplinarity: An Exploration of Scientific Disciplines and the Future of Interdisciplinary Research. Senior Theses, 1–82. https://scholarcommons.sc.edu/senior_theses/464

The disciplinarity of science and the future of interdisciplinarity in science is deeply connected with understanding the scope of scientific practice as well as the demarcation and organization of scientific disciplines. These topics, explored through the structure of their subjects, theories, methods, and interpretation, lead to the conclusion that science and its disciplines are largely defined by the integration of philosophical principles into the ethos of the practices rather than by any specific criteria. The ways in which different disciplines behave and interpret philosophies impact how those disciplines are organized and categorized, resulting in deep philosophical and perspective divides between disciplines. As a result of these conclusions, it can be asserted that interdisciplinary research faces many challenges. To combat the discipline divides, careful consideration of the philosophical discipline differences and the limited perspective of individual disciplines is required. Additionally, interdisciplinary research might consider viewing the disciplines as philosophically and socially unique, as well as equally valid and scientific, in order to effectively collaborate on interdisciplinary science and continue interdisciplinary science through time.

Presentations

[2025] "On Being an Interdisciplinarian: Practical Philosophy in Neurophysics", Presentation, Mind and Matter - Physics and Philosophy Seminar Series

Interdisciplinary work in science is a popular pursuit and often a buzzword in blurbs and bios. However, probing a little deeper into the philosophy of science reveals pitfalls and traps rarely addressed in the day-to-day practice of science. Disciplines in science have large gaps between their individual practices and assumptions that feel, on occasion, somewhat insurmountable. This, however, is the mission of the interdisciplinarian. This talk endeavours to discuss the gap between philosophical principles and practical interdisciplinary science through my experiences in neurophysics. Why is interdisciplinary science important – practically and philosophically? How are the practices and assumptions of a fundamentally interdisciplinary field like neurophysics informed by philosophy? What is the state of parity and collaboration between disciplines in the field?  If interdisciplinary science is key to understanding more about the world around us, not only must one bridge the gap between scientific disciplines like neuroscience and physics, but also incorporate philosophy into scientific practice.

[2025] "Stochastic Actor-Oriented Models of Functional and Structural Human Brain Networks in Aging", Poster Presentation, American Physical Association NW Section Meeting

[2025] "Functional Dynamics in Aging", Presentation, PHAS Symposium 2024

The human brain is a complex and dynamical system that undergoes structural and functional changes throughout the lifetime. As the complexities of the human brain during aging are better understood, greater context can be provided to the experiences and challenges as well as the diseases that can affect these populations. Non-invasive imaging techniques such as functional magnetic resonance imaging (fMRI) allow us to measure large scale connectivity of the human brain. The changes to these networks across the lifetime are still poorly understood. My research develops and tests a model for changes to brain connectivity during aging. I constructed functional brain networks from fMRI data at longitudinal time windows across the lifetime. These time points have been analyzed for which factors, either internal or external to the network, are driving change over time. This can lead to greater understanding of the distinction between healthy and patient populations as well as the dynamics of the connections during aging. This will allow us to map how changes in these connections are linked to specific experiences or biomarkers that occur during the lifespan of an individual. These types of dynamics will bring greater insight to the experiences and challenges that occur during human aging and in future, help individuals experiencing neurodegenerative illness.

[2024] "Functional Dynamics in Aging", Poster Presentation, Hotchkiss Brain Institute Computational Neuroscience Day 2024

[2024] "Functional Dynamics in Aging", Presentation, PHAS Symposium 2024

The human brain is a complex and dynamical system that undergoes structural and functional  changes throughout the lifetime. As the complexities of the human brain during aging are better  understood, greater context can be provided to the experiences and challenges as well as  understand more about diseases that can affect these populations. Non-invasive imaging  techniques such as functional magnetic resonance imaging allow us to measure large scale  connectivity of the human brain. The changes to these networks across the lifetime are still  poorly understood. My research is developing and testing a model for understanding changes to  brain connectivity during aging by constructing functional brain networks from fMRI data at  longitudinal time windows across the lifetime. These time points can be analyzed for which  factors, either internal or external to the network, are driving change over time. This can lead to  greater understanding of the distinction between healthy and patient populations as well as the  dynamics of the connections during aging. This will allow us to map how changes in these  connections are linked to specific experiences or biomarkers that occur during the lifespan of an  individual. These types of dynamics will bring greater insight to the experiences and challenges  that occur during human aging and in future, help individuals experiencing neurodegenerative  illness.

[2023] "Functional Dynamics in Aging", Poster Presentation, Hotchkiss Brain Institute Computational Neuroscience Day 2024

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