Sanne Kellij is a PhD Candidate at CHANGE lab (Leiden University) and the Sociology department (University of Groningen). She examines social-cognitive processes and underlying neurobiology of children, with a specific focus on persistently peer victimized children. Berna Güroğlu, René Veenstra and Gerine Lodder are her supervisors. She obtained her Research Master in Cognitive Neuropsychology (VU University Amsterdam) in 2017. During which, she obtained her BAPD at the medical psychology department of hospital ‘De Gelderse Vallei’ (Ede, NL), and wrote her master thesis at the University of California – Los Angeles (UCLA) on assumptions of signal detection theory.