Developmental researchers have found support for the notion of a critical period for bonding at birth

Dr. Lundberg's research often involves the observation of children interacting with their

parents. During these observations, the number of times that the child smiles and frowns in response to parental instructions is counted. One problem encountered by Dr. Lundberg in this type of research is a. the difficulty in counterbalancing the order of stimulus presentation. b. ensuring that subjects are randomly assigned to groups. c. performing a statistical analysis of the results. d. the subjectivity that may be present in measuring the dependent variable. e. determining how to form a control group.

A negative feeling or attitude that others, especially a group, are inferior to you is called:

A. prejudice B. discrimination C. aggression D. stereotype