In what proportion of families around the world does arranged marriage occur?

Mark thinks that language development over the life span requires a slow but steady shaping process. His belief is most directly relevant to the issue of

A. continuity or stages. B. secure or insecure attachments. C. fluid or crystallized intelligence. D. cross-sectional or longitudinal studies.

The 5-year-old child of two very busy parents has been throwing tantrums. Whenever the child gets angry or upset, one or both of his parents immediately come to his side and fuss over and cajole him. Nevertheless, his tantrums do not diminish. In fact, th

We may assume that for this child his parents' fussing over him serves as a(n) ______. a. negative reinforcer c. positive reinforcer b. punisher d. unconditioned response