The final aim of the study was to examine whether changes in resting frontal EEG coherence across the second half of the first year were indirectly associated with higher cognitive abilities at age 3 through their influence on attentional control at age 2. To assess this, indirect effects from 10-month left frontal EEG coherence to 3-year receptive language, cognitive flexibility, and behavioral IC through 2-year attentional control were tested using a bias-corrected bootstrapping procedure (10,000 draws). This approach has been shown to generate the most accurate confidence intervals for indirect effects, reducing Type 1 error rates and increasing power over other similar tests (MacKinnon, Lockwood, & Williams, 2004). Indirect effects with right frontal EEG coherence were not examined because its association with 2-year observed attentional control was not significant.
