Correlation studies of many pairs of twins have suggested a link between ___________ factors and certain psychological disorders.

Mary learned Spanish as a child and English when she emigrated to the United States as a teenager. What would you expect brain scans to show?

A. Mary would have more activation when speaking English compared to Spanish. B. Mary would have less activation when speaking English compared to Spanish. C. Mary would show different brain areas active when speaking English compared to Spanish. D. Mary would show activity in the same brain areas when speaking English compared to Spanish.

The study of observable relationships among variables is referred to as:

A. correlational research. B. laboratory research. C. experimental research. D. field research.