Martijn started to pursue a life of science in Amsterdam by joining the lab of Dr. Victor Lamme. In 2014, the scientific waters took him into the realm of internally oriented processes, including metacognition, prediction, and creative thinking. He investigated these topics in Brussels with Dr. Axel Cleeremans, in the lab of Dr. Tony Ro in New York, and with Dr. Tristan Bekinschtein in Cambridge (ABC Talent Grant, Marie Skłodowska-Curie Global Fellowship 2018-2021). When working for Sony Computer Science Labs Tokyo (2021-2022), Martijn studied fear learning and  group decision-making together with Ai Koizumi . After working at NYU in the lab of Biyu He, Martijn became a  Ramón y Cajal fellow at the  University of Girona investigating  how (conscious/unconscious) internally generated information emerges in the brain, (collaborating with the University of Granada and New York University) and how visual perception works (in collaboration with the CRM). To this end, he uses psychophysics, neuroimaging methods (fMRI, MEG/EEG), and non-invasive brain stimulation (TMS).