Casey is one of the most cited scientists in developmental neuroscience, with over 250 publications and over 80,000 citations. Over the course of her career, her work has spanned a range of topics across human development from visual attention in infants, to adolescent development, and the subsequent transition into early adulthood. In addition to using fMRI to examine typical and atypical brain and behavioral development, Casey has studied both humans and genetically altered mice in her research. Her work has demonstrated similar patterns of behavior and brain activity during adolescence across species. Casey proposed a prominent model of adolescent neurobiology known as the imbalance model, a foundational theory for many developmental neuroscience studies in humans and in animals. This model posits that dynamic changes in brain structure and function during adolescence lead to transient imbalances in how brain areas communicate that impact emotion reactivity and regulation during adolescence, relative to earlier and later developmental stages. In collaboration with the late
Walter Mischel, Casey studied the original participants of Mischel's famous 1972 Stanford Bing Nursery School "
Marshmallow Experiment" 40 years later. The study's findings suggested that individual differences in self-control seen in early childhood may be predictive of motivational processes and cognitive control in adulthood. During Casey's 15-year tenure as the director of the Sackler Institute for Developmental Psychobiology, she cultivated the institute's world-renowned reputation, bringing in numerous training and center grants from the
National Institutes of Health,
National Science Foundation, the John Merck Fund, the
Dana Foundation, and the
MacArthur Foundation. From 2008 to 2013, one of these awards funded the Center for Brain, Gene, and Behavioral (CBGB) Research Across Development, which aimed to examine how brain-derived neurotrophic factor (
BDNF) influenced learning and responses to stress across development. In 2015, the
National Institutes of Health funded the Adolescent Brain Cognitive Development (ABCD) Study®, the largest long-term study of child and adolescent health and brain development in the United States. Casey was awarded a grant of over $20 million as Principal Investigator of the ABCD Study Yale University site. == Mentoring and training ==