how connection developsHolding someone’s hand leaves the possibility of an unpleasant event in place. The person beside us may have no way to prevent it. Yet their contact can become part of how we meet it. In two experiments led by James Coan, people waited inside a brain scanner to find out whether they would receive an electric shock. Holding a familiar person’s hand changed particular neural responses to that threat, even though the chance of a shock remained the same.
The studies approached the relationship behind that contact from different directions. The 2006 experiment examined women in highly satisfactory marriages and asked whether marital quality mattered. The larger 2017 study included friends and several kinds of romantic partners, then examined relationship status and expectations of available support. Together, they offer a fuller account of what another person’s hand can bring into a difficult moment.
A familiar person can change how we face a threat
Both experiments compared three conditions within the same people. Participants held a familiar person’s hand, held an unseen stranger’s hand, or held no hand. Signals on a screen indicated either safety or a small chance of a brief shock to the ankle. The order of the handholding conditions was varied across participants. The imaging analyses focused on anticipating the shock, excluding trials in which a shock actually occurred to reduce movement-related problems.
In the first experiment, Coan, Hillary Schaefer, and Richard Davidson recruited sixteen married couples. Both spouses had to meet a high satisfaction threshold, and only the wives underwent scanning. The familiar hand belonged to each woman’s husband. In the later study, Coan and colleagues scanned 110 adults aged 23 to 26, each accompanied by an opposite-gender friend, dating partner, cohabiting partner, or spouse.
Across both studies, familiar handholding reduced threat-related activity in selected brain regions compared with holding no hand. The specific pattern varied between the experiments. The earlier study identified reductions in regions associated with bodily responses, attention, and other aspects of responding to threat. The later study found reductions relative to being alone in parts of the prefrontal and posterior cingulate cortices, and a partly overlapping set of differences relative to stranger handholding.
These were comparisons between the response to a threat signal and the response to a safety signal. The scans measured changes in blood oxygenation associated with neural activity. A smaller response in a particular region did not mean that the whole brain switched off or that the threat disappeared. It showed that the neural response to anticipating danger differed with the social contact available.
The researchers interpreted the pattern as consistent with a reduced demand for vigilance and effortful regulation when support was available. In the later paper, they developed that explanation through Social Baseline Theory, which proposes that people take available social resources into account when meeting demands. This offers a possibility beyond working harder to calm ourselves. A supportive relationship may change how much individual regulation a situation calls for. The experiments did not directly measure mental effort or energy saved, so that remains an interpretation of the neural findings.
The person offering contact matters
In the 2006 experiment, stranger handholding also reduced some neural threat responses compared with holding no hand. Husband handholding was associated with a broader set of reductions. One prefrontal region showed a direct difference between husband and stranger handholding. Other findings compared each condition with holding no hand, which does not establish that the two handholders differed in every region.
The larger 2017 study gave stranger contact a different result. It found no significant reduction in neural threat responses during stranger handholding compared with being alone. Familiar handholding, however, differed from stranger handholding in several regions. The authors considered differences between the samples as possible explanations for the stranger findings, while leaving that question open.
The two experiments therefore provide more consistent support for familiar handholding than for unfamiliar handholding. They also make the relationship behind a gesture worth attending to. The same form of contact came from someone with an existing place in the participant’s life or from someone they had never met. Neither experiment included a familiar person sitting nearby without holding hands, so the effects of touch and familiar presence remain intertwined.
Feeling better is one part of the response
The participants’ own reports added something the scans could not supply. After each condition, they rated how unpleasant they felt and how aroused or agitated they felt. In the 2006 experiment, women described the task as less unpleasant with their husband’s hand in theirs than with either the stranger’s hand or no hand. Their reports gave the neural findings a recognizable human counterpart. The same possibility of shock felt less unpleasant with their spouse.
In 2017, participants also reported less negative feeling with the familiar handholder than with the stranger. Being alone was less unpleasant than stranger handholding as well. The familiar-versus-alone difference was smaller and did not meet the conventional threshold for statistical significance. The later study therefore supported a familiar-handholding benefit over being alone more clearly in particular brain responses than in reported feelings.
Reported arousal was less conclusive across the studies. In 2006, average ratings were lower in both handholding conditions than with no hand, but the individual comparisons fell short of statistical significance. In 2017, arousal ratings did not differ significantly across conditions. How unpleasant something feels, how agitated someone feels, and how particular brain regions respond each contribute information about the experience. Support need not produce an identical change in all three for a particular finding to be meaningful.
The relationship and the expectation of support
The earlier study asked whether the quality of a marriage related to the response to a husband’s hand. Although all the couples reported high satisfaction, their ratings still varied. Wives’ assessments of marital quality related to how neural responses differed across conditions in three regions. The general pattern was that higher marital quality accompanied lower threat-related activity during husband handholding.
The strongest statistical evidence concerned the difference in that association across conditions. Within husband handholding alone, only one of the three individual associations met the conventional significance threshold. With sixteen women, the finding was a promising indication that relationship quality mattered, rather than a precise account of how better marriages changed the brain.
Husbands’ ratings did not show the same neural associations. The spouses’ assessments were only weakly related to one another in this small sample. That keeps the person receiving support present in the explanation. Her account of the relationship supplied information that his account did not. It does not make either account the complete description of their marriage.
The reports of unpleasantness also followed a different pattern. Higher marital quality was most strongly associated with less unpleasantness during stranger handholding, rather than husband handholding. The study did not resolve why. This further separates the relationship between marital quality and brain activity from the relationship between marital quality and reported feelings.
The later experiment widened the inquiry from the particular relationship to the participant’s social world. Its questionnaire asked about support available from family, friends, and significant others. That measure described broader expectations of support, rather than simply an opinion of the person holding their hand.
Higher perceived support accompanied lower threat-related activity during familiar handholding and higher activity during stranger handholding in the regions identified by that comparison. The same association did not appear while participants were alone. A supportive social world was therefore related to how these two kinds of contact differed, rather than to a uniformly smaller threat response in every setting.
The researchers proposed that people who expected support from their networks might be especially receptive to contact from someone familiar. The findings leave room for that explanation without establishing how those expectations developed. Marital quality and perceived support were measured, not experimentally changed. Neither study shows that changing a relationship rating or thinking differently about support would cause the observed neural effects.
Together, these findings distinguish having support available from receiving it through a particular relationship. Someone may feel able to turn to several people while finding one person’s company especially welcome in a demanding moment. The research gives that distinction a concrete setting. What participants brought into the scanner included both the person beside them and their experience of relationships beyond it.
Familiar support can include friendship
The 2017 study extended the inquiry beyond marriage. Its participants included roughly equal numbers of friends, dating partners, cohabiting partners, and spouses. The researchers expected relationship category to influence the effects of handholding, but their analyses detected no such differences in either neural or subjective responses.
That finding gives no basis for ranking those relationships by their effects in this experiment. It also does not establish that they were equally effective. Each group contained only about 27 participants, and most married participants were recruited separately from the longitudinal sample that supplied the other groups. Larger studies could detect differences this one missed.
Including friends nevertheless broadened the account of who could provide familiar contact. Marriage was one relationship represented in the study, rather than a requirement for taking part. The findings direct attention toward the person and the support associated with their company, alongside the name of the relationship. Both papers also left important questions about relationships marked by conflict or limited support. Knowing someone and welcoming their contact are distinct parts of an encounter.
The familiar person could not remove the possibility of a shock. Yet across these experiments, their contact altered parts of the response to it. Support was part of how the situation was experienced while its external demands remained the same.
Sources
Coan, J. A., Schaefer, H. S., & Davidson, R. J. (2006). Lending a hand: Social regulation of the neural response to threat. Psychological Science, 17(12), 1032–1039. Read the full paper.
Coan, J. A., Beckes, L., Gonzalez, M. Z., Maresh, E. L., Brown, C. L., & Hasselmo, K. (2017). Relationship status and perceived support in the social regulation of neural responses to threat. Social Cognitive and Affective Neuroscience, 12(10), 1574–1583. Read the full paper.