Figure 4.

Centered gaze lowers head movements. (A, B) Histograms demonstrating the (A) count and (B) probability distribution of rotational velocity for looks to objects (amber) and looks to targets that were not one of the three play objects or the caregiver's face (blue) at each age level. (C) The proportion of the head's rotational velocity during a look which exceeds the seventy-fifth percentile of the rotational velocity in the observed dataset for every subject at each age level with “X” representing the median proportion for that age level. (D) The proportion of the head's rotational velocity during a look that is slower than the twenty-fifth percentile of the rotational velocity in the observed dataset for every subject at each age level with “X” representing the median proportion for that age level.