One portion of the serotonin transporter gene, known as the 5-HTTLPR polymorphism, seems to correlate with someone's sensitivity to emotion. This could explain why some couples feel more satisfied than others in marriages where negative emotions are equally prevalent. A 13-year longitudinal study published in 2013 produced results that were consistent with this theory.
Key Facts In This Video
One longitudinal study found that couples' satisfaction with their marriages didn't necessarily correlate to the emotional environment of the marriage. 00:41
A variation on the serotonin transporter gene may cause someone to be more sensitive to different emotions. 01:43
Genetic variances result in slight biases that aren't immediately obvious from instance to instance. 03:21
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