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P400 amplitude and latency event-related potentials (ERP) to faces and objects. (A) Illustration of the ERP collection procedure; (B) P400 amplitude to faces (top) and objects (bottom) at 12 months; (C) P400 latency to faces (top) and objects (bottom) at 18 months. PFR = promoting first relationships; A+M = assessment and monitoring; Cross = cross-sectional; Long. = longitudinal.
