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5 SAFETY BEHAVIOR AFTER EXTINCTION TRIGGERS A RETURN OF THREAT EXPECTANCY Sophie van Uijen Arne Leer Iris Engelhard Behavior Therapy, 2017 Author contributions: SvU conceptualized the research idea. SvU and AL designed the experiment. SvU programmed the experiment, supervised the data collection, extracted and analyzed the data, and drafted the manuscript. SvU, AL, and IE revised the manuscript.