Have you ever thought that you were mentally in tune with your partner, to the point of remembering or forgetting the same things?
It’s not just an impression: a study published on Quarterly Journal of Experimental Psychology found that when couples remember an event, they synchronize their brain activity even if that experience was not experienced together, and forget the same details. This phenomenon suggests that memory is not just a personal archive, but a dynamic and shared system shaped by social ties.
Contagious oblivion. The study focuses on a phenomenon already known in psychology: those who listen tend to forget the same information as those who speak. The researchers wanted to understand whether this form of “contagious forgetting” was stronger between romantic partners than between two strangers.
Forget together. They then conducted two experiments, involving 19 romantic couples in the first, 20 romantic couples and 18 couples of strangers in the second. In both tests, participants first learned memories, and then in each pair one person told the memory and the other listened.
The results highlighted a clear difference between couples in a relationship and strangers: among romantic partners, “contagious” forgetting was very pronounced, with the listener forgetting details not mentioned by the narrator; among strangers this effect did not appear significantly, contrary to what previous studies found.
Synchronized brains. To understand whether contagious forgetfulness also had a biological basis, the researchers analyzed the couples’ brain activity. They found that the romantic partners’ brains coordinated: Signals in the listener’s lateral prefrontal cortex synchronized with those of the narrator, and this synchronization was much more intense than in pairs of strangers. The stronger the neural connection between the partners, the greater the shared forgetting.
Love shapes memories. The study’s findings suggest that memory is not a purely individual process but that, through the synchronization of brain activity, partners construct a “shared reality” by remembering and forgetting the same details.
The next step is to understand whether similar effects are also observed among friends and family, and whether synchronization is more intense when it comes to emotional memories compared to neutral memories.
