The physical attractiveness of the source of a persuasive communication would be best described as which of the following?

Which brain-scan methods are used to study thought processing with specific brain areas?

What will be an ideal response?

Dr. Riley wanted to know if adolescent computer use has an immediate effect on sustained attention. Dr. Riley assigned participants into one of two groups (computer use vs. no computer use) by flipping a coin. Dr. Riley used

A) matching. B) random assignment. C) a correlational design. D) a field experiment.