Antonius H. N. Cillessen

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About

Antonius H. N. Cillessen is a leading developmental psychologist whose research illuminates the early origins of social and emotional psychopathology. His work centers on how temperamental traits—particularly behavioral inhibition and freezing responses—shape developmental trajectories toward internalizing disorders and callous-unemotional (CU) traits. In a landmark 2018 prospective study (17 citations), Cillessen demonstrated that prolonged freezing behavior in infancy serves as an early risk marker for internalizing symptoms in adolescence, offering a critical window for early intervention. More recently, his 2022 investigation (4 citations) challenged prevailing assumptions by showing that behavioral inhibition may paradoxically protect against the development of CU traits, revealing the complex interplay between fearfulness and empathy. Cillessen’s contributions are notable for bridging observational studies of infant behavior with long-term clinical outcomes, providing empirically grounded insights for prevention science. His work has been instrumental in shifting the field toward identifying subtle, early-life behavioral markers that predict divergent pathways to mental health, making him a key voice in developmental psychopathology research.