When one spouse passes away, his or her characteristics continue to be linked with the surviving spouse’s well-being, according to new research published in Psychological Science, a journal of the Association for Psychological Science. The findings also indicate that this link between the deceased spouse and surviving spouse is as strong as that between partners who are both living.

“The people we care about continue to influence our quality of life even when we they are gone,” says lead researcher Kyle Bourassa, a psychology doctoral student at the University of Arizona. “We found that a person’s quality of life is as interwoven with and dependent on their deceased spouse’s earlier quality of life as it is with a person they may see every day.”

In previous work, Bourassa and colleagues had found evidence of synchrony, or interdependence, between partners’ quality of life, finding that a person’s cognitive functioning or health influences not only their own well-being but also the well-being of their partner. Bourassa and colleagues wondered whether this interdependence continues even when one of the partners passes away.

To find out, the researchers turned to the multinational, representative Study of Health, Ageing, and Retirement in Europe (SHARE), an ongoing research project with over 80,000 aging adult participants across 18 European countries and Israel. Specifically, they examined data from 546 couples in which one partner had died during the study period and data from 2566 couples in which both partners were still living.

As one might expect, the researchers found that participants’ quality of life earlier in the study predicted their quality of life later. And the data also provided evidence for interdependence between partners – a participant’s quality of life earlier in the study was associated with his or her partner’s quality of life later.

Intriguingly, the results revealed interdependence between partners even when one partner died during the study; the association remained even after Bourassa and colleagues accounted for other factors that might have played a role, such as participants’ health, age, and years married.

The researchers were surprised to find no observable difference in the strength of the interdependence in couples’ quality of life when comparing widowed spouses with spouses whose partners remained alive. Importantly, the results from first group of couples were replicated in a second, independent sample of couples from the SHARE study, bolstering the researchers’ confidence in the findings.

“Even though we lose the people we love, they remain with us, at least in part,” explains Bourassa. “At some level, this accentuates how important relationships are for our well-being, but the findings cut two ways – if a participant’s quality of life was low prior to his or her death, then this could take a negative toll on the partner’s later quality of life as well.”

Although the study does not address the mechanisms underlying interdependence between partners, Bourassa and colleagues hypothesize that ongoing interactions are a likely driver of synchrony in intact couples, while the thoughts and emotions generated by reminiscing may explain interdependence for those who lost spouses.

The researchers hope to examine possible mechanisms in future experimental research:

“What we want to know is this: Is just thinking about your partner enough to create the interdependence?” says Bourassa. “If so, how might we use this information to better help those who have lost their spouse?”

Study co-authors include Lindsey M. Knowles, David A. Sbarra, and Mary-Frances O’Connor, all of the University of Arizona.

This research used data from Study of Health, Ageing and Retirement in Europe (SHARE) Waves 1, 2, and 4 (DOIs: 10.6103/SHARE.w1.260, 10.6103/SHARE.w2.260, 10.6103/SHARE.w4.111, respectively). The SHARE data collection has been primarily funded by the European Commission Fifth Framework Programme (QLK6-CT-2001-00360), Sixth Framework Programme (SHARE-I3: RII-CT-2006-062193, COMPARE: CIT5-CT-2005- 028857) and Seventh Framework Programme (SHARE-PREP: No. 211909, SHARE-LEAP: No. 227822, SHARE M4: No. 261982). Additional funding from the German Ministry of Education and Research, the U.S. National Institute on Aging (U01_AG09740-13S2, P01_AG005842, P01_AG08291, P30_AG12815, R21_AG025169, Y1-AG-4553-01, IAG_BSR06-11, OGHA_04-064) and from various national funding sources is gratefully acknowledged (see www.share-project.org).