How Long-Term Couples Remember Together: Research on Shared Memory

Originally published 2017-05-21.

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Long-term couples often remember shared experiences better together than either partner does alone, but not always, and not for every kind of memory. Research by Celia Harris and her colleagues at Macquarie University in Sydney found that when partners talk through a holiday, a wedding or an old friend's name, they can recover details that neither could reach on their own. The benefit depends heavily on how they talk to each other. Couples who build on each other's cues do well; couples who correct, contradict or leave one person in charge often do worse.

Here is what the studies actually showed, the psychology behind "shared memory", and how you can use it in your own relationship.

The idea of a shared memory system

In the 1980s the American psychologist Daniel Wegner proposed the concept of transactive memory. A transactive memory system is the knowledge held across a group, plus each member's sense of who knows what. One partner might keep track of birthdays and appointments, while the other remembers how to fix the boiler and where the passports are. Neither has to store everything, because each knows whom to ask.

Later experiments supported the idea. The researcher Andrea Hollingshead, for example, found that romantic partners recalled information more effectively than pairs of strangers, because they knew how to prompt each other and could leave certain topics to the other person. Over years together, couples can come to work like a single, distributed memory.

Why remembering together does not always help

There is a catch that surprises many people. In laboratory tests, groups who recall a list of words together usually produce fewer items than the same people would if they recalled separately and their answers were pooled. Psychologists call this collaborative inhibition. A common explanation is that hearing someone else's answers disrupts your own way of searching your memory.

Harris and her team wanted to know whether long-married couples, with decades of practice at remembering together, would escape this effect. In a study published in 2011 in the journal Discourse Processes, titled "We Remember, We Forget", they tested 12 married couples aged 60 to 89 who had been together for 26 to 60 years. Each partner first recalled material alone, then again with their spouse.

The answer was mixed. On average, couples did no better and no worse together. Yet individual couples varied widely: some clearly gained from collaborating, while others lost out. Being in a long, close marriage did not on its own guarantee a memory boost.

What successful couples did differently

The researchers analysed recordings of the conversations to see what separated the couples who helped each other from those who did not.

Habits linked to better recall

• Effective cueing: one partner offers a hint, a place or a related detail, and the other picks it up and adds something new.
• Repeating each other's answers, which seems to keep both people on the same track.
• A shared strategy, whether agreed out loud or simply understood, such as going through events in date order.

Habits linked to poorer recall

• Disagreeing about how to approach the task.
• Treating one partner as the sole expert, so the other stops trying.
• Frequent corrections, which seemed to break the flow of remembering.

In other words, the quality of the conversation mattered more than the length of the marriage.

Richer memories, not just longer lists

The team also noticed that sessions where couples did poorly on simple lists were still full of reminiscing, side stories and laughter that never appeared when partners worked alone. So they changed their approach and began to look at the depth of shared memories rather than counting items.

In a 2014 overview in the journal Memory Studies, Harris, Amanda Barnier, John Sutton and Paul Keil described couples as "socially distributed cognitive systems". Across four studies, they looked at memory tests, conversations about shared past events, and the everyday strategies couples use, including notes, calendars, objects and each other. As summarised by the British Psychological Society's Research Digest, talking together brought three kinds of benefit:

1. Recovering lost details, such as finally retrieving the title of a play after a chain of prompts.
2. More vivid accounts, with sights, sounds and feelings that made the memory come alive.
3. Fresh perspectives, when one partner's version cast the event in a new light for the other.

Couples who described their relationship as more intimate, and who were more willing to build on each other's stories, tended to show these benefits most.

Memory, ageing and leaning on a partner

The older couples in these studies had the most difficulty with personal, autobiographical memories when working alone, and this is also where remembering together seemed to help most. That fits a broader picture: as some memory abilities decline with age, people increasingly rely on outside supports, from diaries and phone reminders to the person who shared the experience.

This has a tender and a practical side. A partner can act as a living record of a shared life. It also means that losing a long-term partner can affect memory and identity, not only emotions, because part of the "system" is suddenly gone. If you or a loved one notice memory changes that worry you, talk to a doctor.

Myths about couples and memory

Myth: Two heads are always better than one. For simple lists, collaboration often lowers performance. The benefits appear mostly in rich, personal memories and depend on how the conversation goes.

Myth: Remembering together makes memories more accurate. A confident partner can also introduce errors, and couples may come to share a version of events that neither originally held. Shared memory is richer, but not automatically truer.

Myth: Couples who argue about details remember better. In these studies, repeated corrections tended to go with poorer recall, not better.

Try it at home

You can turn the findings into a small, enjoyable ritual:

• Pick an ordinary shared day, such as a trip or a family gathering, and each write down what you recall before you talk.
• Then talk it through. Offer cues rather than corrections: "Wasn't there a market near the hotel?" works better than "No, you've got it wrong."
• Let each person lead on the parts they know best, but keep both voices in the conversation.
• Look at photos, tickets or old messages together. Objects were part of how couples in the research supported memory.
• Notice where your versions differ, and enjoy it. A different angle on the same day is one of the real gifts of sharing it.

Beyond better recall, these conversations are a chance to revisit good times, and that alone makes them worth having.

Sources: Harris, Keil, Sutton, Barnier and McIlwain (2011), "We Remember, We Forget: Collaborative Remembering in Older Couples", Discourse Processes; Harris, Barnier, Sutton and Keil (2014), "Couples as socially distributed cognitive systems", Memory Studies; BPS Research Digest; Wikipedia, transactive memory. Photo: Lightspring/Shutterstock.