The observed differences in postural sway in association with familial
risk appear to be due to a developmental delay in acquiring
age-appropriate levels of balance among high-risk children
who develop postural control at a slower rate than
low-risk control subjects (Hill et al 2000). Thus, both P300
and postural sway appear to be neurobehavioral indices of
a developmental delay in cognitive and motoric functioning
among high-risk children.