Believe this?

Slate V has been posting short videos where audience reaction is charted over what they are viewing (see the squiggly lines in the image of Vick's apology). Another Slate video "reports" reaction to Hillary Clinton's first ad. The surveys were done by MediaCurves. Survey info is given at the start of the videos. For the "ad," 450 people were monitored. Enough to generalize? Probably not...