1. Timescales of Massive Human Entrainment Riccardo Fusaroli, Marcus Perlman, Alan Mislove, Alexandra Paxton, Teenie Matlock and Rick Dale (2015, in PLoS One) 2. Overview What is the impact of conversational patterns (keynote on Wednesday)? Externally driven collective attention A massive social event: 2012 US presidential debates Measuring collective attention: tweets 1. short-term interactional entrainment 2. slower content entrainment 3. long-term rise and decay Reproducible across debates 3. 2012 US presidential debates Highly salient media event (192 million viewers) debated on Twitter (> 20 million Tweets and 11 million Tweeters 4. An Overview Measuring Attention 5. What is a debate about? I Romney appeared practiced, at ease, confident and fluent: [he] aggressively criticized his opponent [Obama had] a chance to brush his opponent back by hammering home [his program] Display of dominance as a shortcut to evaluate leadership and presidential character (e.g. King et al 2009) 6. Interactional Entrainment Holding the floor Interrupting the interlocutor 7. Obama talking Others talking Time talking (s) Mixed Effects Regression Models: Fixed effects for speaker, duration of speaking in each speech turn, and interaction. Random effect for turn number, along with nested slopes for both candidate identity and time within turn number. Standa 8. Cf. Previous Model + Interruption Standardized Beta > .55 Interactions .1 < Beta < .8 9. Mixed effects models: .1 < R2m