A Comparison of Behavioral Ratings and Heart Rate Measurements in Human Neonates

Abstract
Behavioral ratings and heart rate measurements of 20 neonates were recorded simultaneously under conditions of stimulation and nonstimulation. The 2 measurements were found to be highly correlated both between and within individuals. Consistent individual differences were obtained for both the behavioral ratings and heart rates produced by the experimental conditions. It was found that differences in autonomic activity could be fully evaluated only if levels of behavioral excitation are controlled.