Children's lack of concern over the impact of their nonverbal behavior on others is evidence of their inherent selfishness

__________ greatest achievement has been said to have been his/her "founding of the field of cognitive development as we currently know it."

a) Lev Vygotsky b) Jean Piaget c) Erik Erikson d) Mary Ainsworth

If a child's parents refuse to give him what he asks for until he uses "the magic word," they are teaching him that "please" is a discriminative stimulus

Indicate whether this statement is true or false.