T. (Tim) Varkevisser MSc
© Sjoerd Hilckmann/MCD

T. (Tim) Varkevisser MSc

PhD student
Functional MRI, Machine Learning, Neurofeedback
Place of employment
CMH Utrecht


Tim Varkevisser has been active as a researcher at the Brain Research and Innovation Centre of the Ministry of Defence since 2015, where he specializes in (analyzing) neuroimaging data of military personnel and veterans with aggression regulation problems. For this he uses (among others) techniques from Machine Learning. Tim has a background in both psychology (Bachelor) and neuroscience (Master), and it is particularly the interface of these two areas that appeals to him.

Overview of projects within the BRAIC

Within the Brain Research and Innovation Centre, Tim mainly focuses on investigating anger and aggression complaints among soldiers and veterans. By means of (functional) MRI he tries to find out where these symptoms come from and how we can better treat these symptoms. One of the studies Tim is closely involved in is the MARS study , which stands for Military Aggression Regulation Study. This study focuses on identifying the psychological and neurobiological properties that characterize anger and aggression issues among military personnel and veterans. Tim is also project leader of the ANiMA study. ANIMA is the Amygdala Neurofeedback in Military Aggression study. In this study, soldiers and veterans are trained through neurofeedback using fMRI to better regulate their emotions.


  • Varkevisser, T., Gladwin, T. E., Heesink, L., van Honk, J., & Geuze, E. (2017). Resting-state functional connectivity in combat veterans suffering from impulsive aggression. Social Cognitive and Affective Neuroscience, 12(12), 1881-1889. https://doi.org/10.1093/scan/nsx113
  • Korpel, P. O. J., Varkevisser, T., Hoppenbrouwers, S. S., Van Honk, J., & Geuze, E. (2019). The Predictive Value of Early-Life Trauma, Psychopathy, and the Testosterone–Cortisol Ratio for Impulsive Aggression Problems in Veterans. Chronic Stress. https://doi.org/10.1177/2470547019871901
  • Salminen, L. E., Sämann, P. G., Zheng, Y., Dennis, E. L., Clarke-Rubright, E. K., Jahanshad, N., ... & Seedat, S. (2019). Hippocampal subfield volumes are uniquely affected in PTSD and depression: International analysis of 31 cohorts from the PGC-ENIGMA PTSD Working Group. BioRxiv, 739094. doi: https://doi.org/10.1101/739094