After a film, participants were asked one of five questions….

After a film, participants were asked one of five questions. The five questions were: How fast were the cars going when they smashed each other? How fast were the cars going when they collided with each other? How fast were the cars going when they bumped each other? How fast were the cars going when they hit each other? How fast were the cars going when they contacted each other They found that:

Tracy wants to measure an individual’s brain activities corr…

Tracy wants to measure an individual’s brain activities corresponding to emotional responses to pictures of cats at the moment the pictures are displayed. Although she is interested in the response pattern, she is more concerned about when it happens. What is the best technique for her to use?