In an experiment, researchers manipulate the __________ of the __________ variable

Physical changes in the associative areas of the cortex during late childhood and early adolescence are thought to contribute to

A) increased processing speed. B) crystallized intelligence. C) selective attention. D) the competence-performance gap.

Toddlers in traditional cultures are still held and carried for about half their waking hours. What effect does this have on the development of their motor skills? Toddlers in traditional cultures ____

a. are considerably behind toddlers in developed countries b. are only slightly delayed compared to toddlers in developed countries c. are equal to toddlers in developed countries d. are actually more advanced than toddlers in developed countries because they experience fewer injuries associated with walking earlier