Fig. 2

Posterior event-related potentials. a Illustration of the grand average event-related potential over left occipital electrodes at 6 months, showing the P1, N290, and P400 components. b Mean latency of the P400 response to faces or objects at 6 months in the four groups (low-risk control, HR-ASD+, and HR-ASD-Neg). c Mean latency of the P400 response to faces or objects at 12 months. All error bars are ±1 standard error