ten-month-old tauji is a happy, laid-back baby. he often smiles and laughs and is rarely cranky unless he is hungry or tired. due to his easy temperament, tauji’s parents and other adults enjoy interacting with him. he receives frequent hugs and kisses which, in turn, results in more positive interactions. the interaction between tauji’s behavior and the supportive environment in which he is being raised is an example of .