02/23/2013 05:42 pm ET

Miserable Couples Get More Miserable By Wallowing In Their Misery

Online dating has done plenty to disrupt today's dating patterns, but there is an older technological innovation that has greatly improved the potential for happy marriages: videotape.

"It transformed our understanding of couples," recalled Howard Markman, co-director of the Center for Marital and Family Studies at the University of Denver. Self-reporting, which asked couples to describe their own behavior, was notoriously unreliable, but viewing taped interactions between couples proved illuminating

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