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Staff, Collaborators, and Alumni

Lab Director

Steven A. Hackley, Ph.D.
Associate Professor, University of Missouri-Columbia

Dr. Hackley's research focuses on attention and action in healthy adults and people with Parkinson's disease. As noted on the Research Interests page, this research often involves contrasting conscious, voluntary reactions with responses that are unconscious and purely reflexive. Dr. Hackley's doctoral degree is from the University of Wisconsin, Madison and his postdoctoral training was at the University of California, San Diego.



Principal Collaborators

Fernando Valle-Inclán, M.D.
Professor, University of La Coruña, Spain

Dr. Valle-Inclán has been the lab's primary collaborator since 1995. He participates in weekly lab meetings via Skype. Dr. Valle-Inclán's interests include unconscious vision, stimulus-response congruence effects, binocular rivalry and monocular representations. He received his medical degree at the University of Santiago de Compostela (Spain) and his postdoctoral training at Gröningen University (the Netherlands).



Hiroaki Masaki, Ph.D.
Associate Professor, Waseda University, Japan

Dr. Masaki is a sports psychologist with expertise in the neural basis of motor control, error-related processes and motivation (e.g., response-contingent rewards). He earned his Ph.D. at Waseda University, in Tokyo, and did extensive postdoctoral work at Humboldt University in Berlin.



Nelson Cowan, Ph.D.
Curators' Professor, University of Missouri-Columbia

Dr. Cowan is regarded as one of the world's foremost authorities on working memory. His related interests include selective attention, echoic and iconic memory, and the development of memory and attention in children. His Ph.D. is from the University of Wisconsin, Madison.



Prof. Dr. rer. nat. Dr. rer. med. habil. Daniel J. Strauss
Professor, University of Saarlandes

Dr. Strauss is a research engineer focusing on auditory physiology and human-machine interactions. His collaboration with Dr. Hackley’s lab concerns measuring muscle activity and micro-movements of the ears during attention and emotion. His doctoral degrees are from the University of Saarlandes.



Graduate Students

Amy Underwood Barton, M.A.
Mrs. Barton earned her Bachelor's degree at the University of West Florida and her Master's degree at the University of Missouri-Columbia. Her research interests include attention, working memory, and unconscious visual perception.



Sabrina Bhangal, M.A.
Ms. Bhangal earned her MA and BA degrees at San Francisco State University. Her interests include working memory, attention-related brain potentials, subitizing, and meta-cognition.



Recent Alumni

Xi Ren, Ph.D.
Dr. Ren earned her PhD in 2018 and is now a postdoc in the Department of Psychiatry at the University of Pittsburgh. Her interests include attention-, memory-, and reward-related slow potentials in Parkinson’s disease, as well as auditory event-related potentials in schizophrenia.



Gabriella Johnson Stamper, M.D., Ph.D.
In 2017, Dr. Stamper became the first African-American woman to earn an MD-PhD at Mizzou. She is currently a resident physician in the Department of Psychiatry at the University of Washington, Seattle. Her research interests include affective modulation of the post-auricular reflex and the evolution of emotion in primates.



Eun-Young Lee, Ph.D.
Dr Lee earned her PhD in 2012, worked as a postdoc in the Department of Neurology at the Pennsylvania State University School of Medicine, and is now an assistant professor in the Department of Health Care and Sciences at Dong-A University in Busan, South Korea. Her research focuses on structural and functional brain changes in Parkinson’s disease and early predictors of PD and related disorders.



Karen Hebert, Ph.D., OTR/L
After earning her PhD at this lab in 2012, became an assistant professor and co-chair of the Department of Occupational Therapy here at Mizzou. She is now an assistant professor at Seton Hall University in New Jersey. Her research interests include affective modulation of the startle and post-auricular reflexes, reward anticipation in Parkinson’s disease, therapeutic deep-brain stimulation for PD, eating disorders, and mindfulness.