Growth mindset intervention
Students learned about brain plasticity (All lessons were provided by researchers: eight undergraduates with a (research) master in developmental (neuro)psychology or neuroscience, between 28-01-2019 and 22-02-2019 (school 1) and between 11-03-2019 and 05-04-2019 (school 2), during regular mentor hours. Pairs of undergraduates jointly gave both the control and growth mindset interventions, to eliminate potential teacher biases. Undergraduates were trained and supervised by the lead investigator of this study, T.W.P. Janssen, and followed a detailed protocol for teaching each lesson. There were no statistical differences in registered attendance of participating students between the growth mindset and control groups (means: 3.61 and 3.66 out of four lessons), F(1,437) = 0.398, p = 0.528. Across all participants, 76.8% attended all 4 lessons, and 94.6% attended 3 or 4 lessons.