How far does emotional contagion at work spread?

By lunchtime, one of your managers has cancelled a planning session “until things settle”. Another has told her team the budget looks tight, though nobody said that. A third is quieter than usual with a supplier. None of them could tell you exactly why. You set the weather, and they dressed for it.

That is emotional contagion at work, and the question worth asking is not whether it happens, but how far it goes.

What is emotional contagion at work?

It’s the way moods pass between people in a group. One person’s irritation, anxiety or calm is picked up by the people around them, who then pass it on to the people they deal with next. Most of the time, nobody involved notices.

Sigal Barsade at Wharton has studied this for years. In a Wharton Magazine profile of her work, she puts it simply: “No person is an emotional island.” She describes us as “walking mood inductors,” passing our own moods to others, who carry them on to the people they meet.

Her interest started with a crabby colleague. When that colleague went on holiday, the group became noticeably more pleasant. When she came back, everyone tensed up again. She wasn’t telling anyone what to do. Her mood was simply in the room.

The practical point for leaders is this. Moods don’t stay where they start. They travel along the same lines as your work does: through meetings, messages, decisions and the people who report to you.

Are emotions really contagious in the workplace?

Yes. Controlled studies have shown moods spreading through groups and changing how those groups behave, and the people affected usually didn’t realise it.

Barsade’s best-known experiment, described in the same profile, put groups of business students into a negotiation over how to share out a fixed pot of bonus money. Each group included a trained actor who played a different mood with each group, while making exactly the same requests. Where he was negative, the others picked up his bad mood and cooperated less. Where he was calm and pleasant, the group was pleasant and cooperative too.

Two findings matter for anyone who leads. First, the participants didn’t see it. According to the profile, “none of them seemed aware of what had gone on,” and they explained their own performance by other factors. Second, good moods spread as well as bad ones. Barsade’s conclusion was that the more positive the emotion, the more cooperation and the less conflict the group showed.

So contagion isn’t only a risk. It is also a tool. But you can only use it on purpose if you know it’s there.

Does a leader’s mood affect the team more than anyone else’s?

The research suggests a leader’s mood does shape the group, and it’s reasonable to expect it to travel further, because more people take their cue from you and more decisions pass through you.

Barsade’s actor was a peer, not a boss. A separate study looked at leaders directly. Thomas Sy, Stéphane Côté and Richard Saavedra, writing in the Journal of Applied Psychology, tested what happens when a leader’s mood changes. In their abstract, they report that when leaders were in a positive mood rather than a negative one, members felt more positive and less negative, and “groups had a more positive and a less negative affective tone.” Groups with positive-mood leaders also “exhibited more coordination” than groups whose leaders were in a negative mood.

The picture isn’t entirely simple. The same abstract reports that groups with negative-mood leaders expended more effort, and the Wharton profile notes it’s still an open question whether managers influence their teams more than other members do, or are sometimes more susceptible themselves. So treat the research as showing that leaders’ moods matter, not as a formula for exactly how much.

What a senior role adds is reach. Gallup estimates that managers account for at least 70% of variance in employee engagement scores across business units. That figure is about managers in general, not moods in particular. But it’s a useful reminder of how much of a team’s experience flows from the person they report to. When you lead managers, your mood reaches their teams through them.

How many people does a senior leader’s mood reach?

More than most leaders guess. Add up four groups: your direct reports, the people in their teams, the peers you work with every week, and the customers or partners your area deals with. The total is your ripple.

Each group feels you differently:

• Direct reports see your mood first-hand. They read your face in meetings and your tone in messages, and they adjust their own day to match.
• The people in their teams feel it second-hand. They rarely see you, but they see their manager just after their manager has seen you.
• Peers feel it in how you negotiate, how quickly you reply and whether you’re easy to work with that week.
• Customers and partners feel it furthest down the line, through the people in your area who deal with them.

You don’t need precise numbers. A rough count is enough to change how you think about your Monday.

What does that look like in practice?

Here’s a worked example. It’s an illustration with round, made-up numbers, not a real company or person.

Say you’re a director with 5 direct reports. Each of them runs a team, and together those teams hold 45 people. You work closely with 6 peers across the organisation each week. And your area deals with about 24 customers or partners in a normal week.

Add them up:

5 + 45 + 6 + 24 = 80 people

So a bad Monday, in this example, reaches 80 people. Of those, 5 + 45 = 50 work in your own area. They’ll feel your mood directly or through their manager, probably by the end of the day.

Now look at where the number comes from. Your 5 direct reports are only 5 of the 80, about 6%. The other 75 are people you may barely speak to that week. That’s 15 people in the wider ripple for every person you see first-hand (75 ÷ 5 = 15).

This is the part leaders tend to miss. You manage your mood with the 5 people in the room, and you think you did fine. But each of those 5 carries something out of the room, and passes it on to everyone who reports to them. Your managers are the channel. If they leave your meeting tense, 45 people get a tense manager.

Before you go on, a quick self-check from The 42 Test:

Should a leader hide a bad mood from the team?

No. Hiding it rarely works, and people tend to sense when something is off. The goal isn’t to look cheerful. It’s to stop a bad mood from making decisions and setting the tone for people who had nothing to do with it.

Barsade, in the Wharton profile, describes the familiar experience of arriving at a meeting annoyed and ending up shouting at someone who isn’t the person you’re cross with. Her point is that knowing contagion is happening helps you resist it. The same applies when you are the source.

Three things help more than pretending:

• Name it briefly, and own it. “I’ve had a rough start to the week. If I’m short with anyone, it isn’t about you.” One sentence lowers the guessing that would otherwise spread.
• Separate the mood from the message. If you have hard news to share, share the facts and what happens next. Don’t let your tone add worry the facts don’t justify.
• Delay what can wait. Big or hard-to-reverse calls made in a foul mood tend to carry that mood with them. If a decision can wait a day, let it.

If you lead managers, the most useful thing you can do is look after them. They are the layer that turns your mood into their team’s week. A five-minute check-in after a tense meeting (“That was a hard one. How are you taking it back to your team?”) can stop a ripple before it spreads.

How do you use the ripple effect of leadership for good?

Treat your arrival as a decision. Pick the first meeting of the week, decide in advance how you want people to leave it, and walk in with that in mind.

Barsade’s findings cut both ways: calm and warmth spread too. That gives you something to work with on the hard weeks, not just the easy ones.

• Plan the first meeting. Decide what you’ll say first and what you won’t say at all. Say less than you feel, not more.
• Take pressure from above, don’t pass it on raw. Your team needs to know what’s changing and why. They don’t need to absorb your frustration with how it was decided.
• Notice who’s carrying it. Watch for the manager who goes quiet, or the team that stops asking questions. Those are often the first signs your mood has landed somewhere.
• Ask what it felt like. You can’t see your own ripple from the inside. How do I find out what my team really thinks of me? has practical ways to ask without putting people on the spot.

There’s a cost side to this as well. A leader whose mood regularly lands hard on people tends to lose them. What does a bad manager cost a company? walks through how to put a number on that, and the Cost of a Bad Boss calculator does the arithmetic.

Where do you start?

Count your ripple. The free Ripple calculator adds up your direct reports, the people in their teams, the peers you work with weekly and the customers or partners your area touches, and gives you one line: “My bad Monday reaches N people,” with the breakdown underneath. There’s no sign-up, it runs in your browser and it uses only the numbers you type in. Nothing is sent anywhere. It doesn’t judge you or score your mood. It just shows how far your week travels, so you can decide what to do with that.

If you want to look at the habits behind the number, The 42 Test is free too. It asks whether you take the heat from above so your team doesn’t feel it, and whether you notice when someone is overloaded before they tell you, alongside 40 other everyday behaviours. Presence Check looks at how you come across in the room. And for more on leading at this level, see the senior leaders page.