____ uses high-frequency sound waves that are directed toward the uterus and as they bounce off the fetus they are converted by a computer to an image that can be viewed on a screen

Which of the following is a benefit of longitudinal research?

a. provides systematic control of stress b. costs less than cross-sectional research c. allows one to rule out reverse causality d. easier to conduct than cross-sectional research

When you look at a summer sky and see familiar objects in the clouds, you are using the process of top-down processing

Indicate whether the statement is true or false.