The experiment involved flashing a photograph of someone's partner on a computer screen for just one third of a second, followed by a positive word such as "awesome" or "terrific" or a negative word such as "awful"or "terrible".
The subjects had to respond to whether the words were positive or negative by pressing a computer key and their reaction times were measured down to thousandths of a second. But it takes longer to respond to negative words if someone's gut feelings toward their spouse also tends to be negative, Professor McNulty said.
"It's generally an easy task, but flashing a picture of their spouse makes people faster or slower depending on their automatic attitude towards their spouse," he said.
"People who have really positive feelings about their partners are very quick to indicate that words like 'awesome' are positive and very slow to indicate that words like 'awful' are negative words," he added.
People with negative gut feelings towards their partner had a harder time overcoming the negative reaction they momentarily felt on seeing their spouse's photograph, which delayed their reaction time to the positive words.
This negative gut reaction had little connection to what the couples were saying about their partners. Whether they realised it or not they were suppressing their gut feelings, McNulty said.
Yet, it was clear that gut reactions were a better predictor of future happiness or dissatisfaction than conscious appraisals of partners at the outset of a marriage, the study found.
- Independent