One of the well-known challenges of marriage is keeping the passion alive after years of partnership, as passions tend to decline even in very happy relationships.
Previous research has shown that marriage satisfaction often declines even when day-to-day behaviours stay the same.
Researchers from Florida State University in the US hypothesised that an intervention focused on changing someone's thoughts about their spouse, as opposed to one that targets their behaviors, might improve relationship quality.
They wanted to find out whether it was possible to improve marital satisfaction by subtly retraining the immediate, automatic associations that come to mind when people think about their spouses.
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Researchers designed their intervention using evaluative conditioning. Images of a spouse were repeatedly paired with very positive words or images - like puppies and bunnies.
Participants in the study included 144 married couples, all under the age of 40 and married for less than 5 years.
At the start of the study, couples completed a series of measures of relationship satisfaction.
Each spouse was asked to individually view a brief stream of images once every 3 days for 6 weeks. Embedded in this stream were pictures of their partner.
Those in the experimental group saw the partner's face paired with positive stimuli (eg an image of a puppy or the word "wonderful") while those in the control condition saw their partner's face matched to neutral stimuli (eg an image of a button).
Couples also completed implicit measures of attitude towards their partner every 2 weeks for 8 weeks.
The data showed that the evaluative conditions worked. Participants who were exposed to positive images paired with their partner's face showed more positive automatic reactions to their partner over the course of the intervention compared with those who saw neutral pairings.
More importantly, the intervention was associated with overall marriage quality.
As in other research, more positive automatic reactions to the partner predicted greater improvements in marital satisfaction over the course of the study.