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If you’re feeling stressed right now, you’re not alone. One-quarter of Canadians report experiencing high levels of stress on most days and almost half of Canadians .

And unfortunately stress affects how we treat the people around us — sadly, its often not in a good way. Being stressed can actually make people .

Stress affects us all on multiple levels. It affects our body, mind and behaviours. I was recently part of a team of researchers who examined how in social behaviours when under pressure.

We wanted to understand how stress hormones, brain responses and our thoughts about others work together to explain how stress can make people selfish and why it doesn’t happen to everyone to the same degree.

Stress impacts altruism

In our study, we asked participants to donate to various charities before and after undergoing a social stress. To simulate the consequences of most altruistic acts in the real world, donations in this experiment had real consequences.

Participants were given 20 euros and could keep whatever money they decided not to donate. We found that while keeping the money and being selfish literally paid off, most participants were willing to support charitable causes.

However, after participants were , their biological stress responses — as captured in increased levels — were negatively linked to their generosity.

In other words, higher bodily stress responses diminished altruism.

But not everyone was affected by stress in the same way. Participants’ susceptibility to the stress hormone cortisol was related to their ability to understand others’ inner mental states (like their needs, beliefs, goals or points of view). This ability is sometimes referred to as mentalizing or theory of mind and is .

Participants with high mentalizing skills were the ones who were particularly vulnerable to becoming more selfish under stress.

The brain after stress

We measured participants’ brain activity during charitable giving, both before and after stress, using .

We found that there is a region of the brain that mediates a cortisol-related shift of altruism: the dorsolateral prefrontal cortex. This area has long been known to and .

The stress hormone cortisol altered the activation patterns in this brain region and mediated the negative effects of stress on altruistic behaviour. It provided the missing link between bodily stress responses and observed changes in our social behaviour. Specifically, it explained how exactly the brain responds to stress and contributes to the changed willingness to help under pressure.

Our study’s findings are important because they reveal several things:

1. They help understand the link between the body’s stress responses and the change in our willingness to help others. Societies depend on people’s willingness to share, cooperate and help. Altruism is a building block of functioning societies — represent a potential risk factor.

   Understanding how stress can impact our towards other people and organizations is vital. Understanding this can ultimately help develop new interventions that target the elements altered by stress experience.

2. Not all people are the same: not everyone shows the same response under stress. Identifying the characteristics that explain susceptibility to stress effects is useful because they can help protect vulnerable people by informing us who they are.

3. These findings point towards strategies to buffer against the potentially harmful ways we treat others due to stress responses. Specifically, the results suggest that targeted interventions that reduce stress levels may improve altruism among Canadians (especially in those who are high mentalizers).

More research is needed to prove this proposition, but it provides an exciting avenue for anyone interested in creating more prosocial communities and environments. While it might not be the first thing that comes to mind, new and effective ways to reduce stress in vulnerable members of our communities could be key to ensure supportive social environments.

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, Assistant Professor, Psychology, .

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