approached significancep = 0.07
The main effect of MATH approached significance [ F (1,94) = 3.49, p = 0.07, η 2 = 0.04], indicating that higher growth mindset regarding math ability was marginally associated with larger P300 difference amplitude [with lower quartile scores (3.5) P300: mean at Fz = 5.01 μV, mean at Cz = 6.58 μV, mean at Pz = 4.79 μV; with higher quartile scores (5.25) P300: mean at Fz = 8.24 μV, mean at Cz = 10.14 μV, mean at Pz = 8.56 μV].