LAB DIRECTOR
Thad Polk, Ph.D.
Professor Thad A. Polk is an Arthur F. Thurnau Professor in the Department of Psychology at the University of Michigan. He also chairs Michigan’s Institutional Review Board for Health Sciences and Behavioral Sciences and serves as an Associate Chair in the Psychology Department. His research combines functional imaging of the human brain with computational modeling and behavioral methods to investigate the neural architecture underlying cognition. Some of his major projects have investigated changes in neural representations as we age, contributions of nature versus nurture to neural organization, and differences in the brains of smokers who quit compared with those who do not. Dr. Polk has taught well over 6,000 UM students over the past 20 years. In 2006, he was named an Arthur F. Thurnau Professor in recognition of outstanding contributions to undergraduate education, and in 2012 Princeton Review included him on its list of the Best 300 Professors in the US. In 2020, Dr. Polk was named the Samuel D. Epstein Collegiate Professor of Psychology in recognition of his work an inspiring teacher, outstanding researcher and selfless administrator.
POSTDOC
Molly Simmonite 
Molly is a postdoctoral Research Fellow in the Department of Psychology at the University of Michigan. She received her PhD in Psychiatry in 2013 from the University of Nottingham, UK, where she investigated cerebral connectivity in psychosis. She joined the Computational & Cognitive Neuroscience Lab in April 2016, and uses functional MRI, MR spectroscopy and behavioral methods to study the effects of aging on the brain. Her research interests revolve around trying to understand the architecture and behavior of the complex brain networks which underlie normal and pathological brain states.
GRADUATE STUDENTS
Poortata (Pia) Lalwani
Dalia Khammash
Dalia joined the Psychology department in 2017 and is a Ph.D. student in the Cognition and Cognitive Neuroscience area. She received her Bachelor of Science from the University of Michigan in Biopsychology, Cognition, and Neuroscience in 2016. In the Computational and Cognitive Neuroscience Lab, Dalia uses a noninvasive neurostimulation technique called transcranial magnetic stimulation (TMS). Her goal is to investigate how TMS affects activity in the motor and visual areas of the brain in both healthy and clinical populations.
Katy Michon
Katy Michon joined the Psychology department in 2020 as a Ph.D. student in Cognition and Cognitive Neuroscience. She received her Bachelor of Arts in Psychology from the University of Michigan in 2018. In the Computational and Cognitive Neuroscience Lab, Katy uses person-specific neuroimaging techniques and transcranial magnetic stimulation (TMS) to understand how individual differences in the brain are related to individual differences in behavior.
Shreya Karippurathu Rajagopal
Shreya joined the Polk Lab in 2020 as a Ph.D. student in the Cognition and Cognitive Neuroscience. She graduated as an Electronics and Communication engineer from Manipal Institute of Technology, Karnataka, India in 2018, following which she worked as a research assistant in the Center for Neuroscience at the Indian Institute of Science, Bangalore. With her work in predicting progression to Alzheimer’s Disease in patients with Mild cognitive impairment there, Shreya became interested in studying individual differences in brain aging. In the Polk Lab, she is investigating whether a combination of neural and cognitive measures can predict the onset of Alzheimer’s disease. She is also using EEG techniques to study how neural representations of different stimuli of the same modality become less distinct with age. She is also very interested in understanding how reinforcement learning occurs in animals, and is working on a computational model of the same. In her free time, Shreya can be found experimenting with water colors, dancing or taking absurdly long walks.
LAB MANAGERS
Abbey Hamlin 
Abbey joined the Computational & Cognitive Neuroscience Lab as Lab Manager in June 2020. She graduated from the University of Michigan in May 2020 with a B.A. in psychology and a Spanish minor. She wrote a senior honors thesis entitled “Social Engagement and Episodic Memory in Black and White Older Adults.” Her research interests include cognitive aging, racial and gender disparities in health, and developing cognitive and behavioral interventions for adults with Alzheimer’s disease. Abbey is also interested in exploring brain imaging techniques as a means to better understand cognitive aging. Ultimately she plans to attend a doctoral program in clinical neuropsychology.
Violet Zhou
Violet joined the Computational and Cognitive Neuroscience Lab in Fall 2021. She received a Master’s degree in Education Psychology from the University of Texas at Austin in August 2021 and earned a Bachelor of Mechanical Engineering in 2013 from Tongji University in Shanghai, China. After she graduated from college, she worked as an engineer and project manager for developing the Internet-of-Vehicles and actively joined a research project on aging and memory and the effectiveness of certain interventions on Alzheimer’s Disease. She worked as a research assistant at Legare Lab at UT Austin on a cross-cultural study of children’s cognitive development and social learning. Led by her interests and passion in Neuroscience and Clinical Psychology, she wants to explore the neural mechanism of cognitive impairment and to contribute to novel interventions and therapies for psychopathology in the clinical field.
RESEARCH ASSISTANTS
Saachi Mittal
Saachi is a senior majoring in Public Health. She joined the Computational and Cognitive Neuroscience Lab in winter 2019 and is eager to learn more about the effects of aging on neural and behavioral performance using functional magnetic resonance imaging and behavioral techniques. Currently, Saachi is working on maintaining brain artifact logs and reviewing the quality of magnetic resonance spectroscopy data. Saachi plans to attend medical school after completing her undergraduate degree.
Gregory Kondas
Gregory is a junior who is currently undecided in his intended major. Joining Polk Lab in Fall 2020, he is mainly focused on quality control efforts with an emphasis on automation of the quality control procedures within the lab. Gregory is eager to learn more about the overall research process as well as the intricacies of the brain involving aging. Gregory hopes to attend medical school following graduation.
Ethan Nelson
Ethan is a junior majoring in Biopsychology, Cognition, and Neuroscience and minoring in Medical Anthropology who joined the Polk Lab in January of 2021. Ethan is excited to dive deeper into the field of cognition and neuroscience. He hopes to attend medical school after obtaining his undergraduate degree.
Arianna Lessard
Arianna is a Senior majoring in Biopsychology, Cognition, and Neuroscience. She joined the Polk Lab in January of 2021. Arianna is passionate about cognitive psychology and neuroscience. Arianna is the social media coordinator for the Polk Lab, and she is also working on literature review, patient screening, and data entry. She’s excited to continue contributing to the growing field and the Polk Lab. Arianna plans to attend a PhD program in Clinical Psychology after receiving her undergraduate degree.
Nikhil Paruchuri
Nikhil is a junior planning on majoring in Biology. He joined the Polk Lab in Winter 2021 and is looking forward to learning more about the cognitive processes of the brain and how it can be studied through neuroimaging techniques. Nikhil hopes to attend medical school after graduating from Michigan.
Jonas Hart
Jonas is a junior majoring in Biopsychology, Cognition, and Neuroscience and Political Science, and he joined the Polk Lab in May of 2021. Jonas is deeply interested in the rapidly evolving field of computational neuroscience and the growing body of literature investigating individual differences in brain organization. He hopes to attend law school following his graduation, after which he would like to pursue a career in patent law to protect intellectual property in neuropharmacological developments and new neuroimaging technologies.
Hannah Feng
Hannah is a sophomore planning to double major in Biopsychology, Cognition, and Neuroscience and International Studies. She joined the Polk Lab in Fall 2021 and she is excited to learn about individual variation in brain organization. Currently, Hannah designs tasks for neuroimaging studies, conducts literature reviews, and interacts with patients during research. After graduation, Hannah plans to attend law school and receive her Master’s degree in psychology.
Graham Branton
Graham is a senior majoring in both Neuroscience and Philosophy. He joined the Polk lab in Fall 2021, where he primarily works on literature reviews. Graham is very interested in the neuroscience underlying behavioral and cognitive processes, and he hopes to continue to learn more about the neuroscience of addiction and sleep. Graham intends to apply to Physician Assistant programs upon graduation.
Isis Meng
PICTURES OF THE TEAM
