A hypothesis of increased intrusive and repetitive thoughts after any undischarged negative emotional-ideational state was based on previous experiments which involved films which aroused fear and anger and was extended to include a film that arouses sadness. 19 university students saw a film with a separation theme and had levels of intrusions, film references, and negative affect similar to those of subjects who saw films with themes of bodily injury.
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Wilner et al. (1975) studied this question.
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