Maternal Sensitivity Scales The Baltimore Longitudinal Project ( 1969 )

tional psychodynamic thinkers, Bowlby (1969) emphasized the importance of actual experience in shaping personality. According to Bowlby, the organization of secure base behavior arises from an interaction between biases in human infants' learning abilities and an environment that provides organized secure base support. Rather than programming into the genome all the information necessary for organized secure base behavior, evolution has taken advantages of information that is ordinarily available in the human caregiving environment provided by an available responsive caregiver. Bowlby referred to this as the "ordinary expectable environment".