Mother-designated IM (vs. SI) status was predicted by high parent-reported attention but low parent-reported inhibitory control. However, the latter effect was not significant when T1 inhibitory control, which was related in the reverse direction, was not included as a covariate. There were no effects for impulsivity, but 2 of 4 effects each were significant for anger and sadness. IM was predicted by low anger and sadness. Thus, IMs and SIs differed primarily in negative emotion and mostly within context.