Thank you to Dr. Deborah Dawson, an incredible mentor and role model, who provided very helpful guidance on the meta-analysis. Without several friends and classmates, this dissertation truly could not have been completed. Anne Welhaven-without you, I would still be in that archive in Urbana, taking photos of Ad Council ads. Anne Abbott-your enthusiasm for the content analysis made the final product so much better and the process so much more fun! Christine Kava-every time I see that stack of forms you filled out I remember how lucky I am to have a friend like you; now that my dissertation is complete we can catch up on our TV! I also owe a debt of gratitude to my parents for always encouraging my curiosity and thirst for knowledge. I've almost got a real job, Dad, and I couldn't have done it without you and Mom's support. And finally, I must thank my friend Michael, who has always been a great support and was determined that this quote go in my dissertation: "Humor can be dissected, as a frog can, but the thing dies in the process and the innards are discouraging to any but the purely scientific mind."-E.B. & K.S. White