Chapter 4 infancy: sensation, perception and learning. Infant state: a recurring pattern of arousal in the new born, ranging from alert, vigorous, wakeful activity, to quiet, regular sleep: tells us important characteristics of human behavior. from early in life, human behavior is organized and predictable (infant states occur in a regular fashion) human beings are not passive creatures that merely react to the environment (internal forces regulate much of our behavior and explain many of the changes in our activity levels: two basic infant states: waking and sleeping, sleep. newborns sleep about 70% of the time in a series of long and short naps. they sleep during the night and less in the day as they get older. they become less fussy as they gain control. sleeping arrangements of parents and children represent central ideas about.