The percentage of infant gaze following and heart rate levels from Physiological arousal predicts gaze following in infants

Data from twenty-five 10-month-old infants. In the baseline phase of each condition, the actress remained still for two seconds and then looked up gradually into the camera with both eyes closed. This was followed by the action phase, which differed between conditions. In the Eye Contact (EC) condition, the actress raised her eyes and looked into the camera for three seconds. In the No Cue (NC) condition, the actress closed her eyes for three seconds. In the Shivering (SV) condition, the model made a few rapid horizontal head shakes as if shivering for three seconds with closed eyes. The third phase was the Gazing phase. In this phase, the actress turned her head approximately 45° toward one of the two objects on the table and fixated on it for five seconds. In the NC and SV conditions, the actress opened her eyes just before shifting her head. All three conditions were run within-subject, and a total of 12 trials were presented to each infant. The principle measurement of gaze following was the infants first saccade toward an object during the gazing phase. If the infant looked at the same object the actress gazed at, their gaze behaviour was coded as gaze following. We separated the heart rate data from each of the three phases (Baseline, Action, and Gazing), and then we averaged the R-R intervals in each phase.