At the World Economic Forum in Davos, Canadian Prime Minister Mark Carney received a rare standing ovation following a speech described as a “truth bomb” regarding the breakdown of the international rules-based order.

The next day, after a speech that stretched more than twenty-five minutes beyond its allotted slot, US President Donald Trump was met with a response best described as courteous rather than enthusiastic. For much of the packed hall, hands came together briefly, before returning to laps and phones. 

It would be easy to read this as a referendum on the speakers themselves. Such was the apprehension leading to Trump’s speech it may be an outlier of assessing how to read the room. 

But applause is rarely a simple thumbs-up or thumbs-down. Research across psychology, sociology and political science shows that applause is a structured social act, shaped as much by context and coordination as by conviction. People clap not only to express approval, but to signal belonging, to avoid awkwardness, and to solve a surprisingly tricky collective problem: when to start, how long to continue, and when it is finally safe to stop.

Why clapping is a collective decision

Research by Richard Mann at Uppsala University studied applause as a form of collective behaviour. By analysing recordings from concert halls, they demonstrated that individuals rarely decide to clap in isolation. The decision depends on how many people are already clapping, and whether that number seems to be growing. A few confident early clappers can tip the room into applause, but without them, even an appreciative audience may remain silent.

This threshold dynamic explains why applause so often begins suddenly. Once the perceived risk of being the only person clapping disappears, joining in becomes the sensible option. The same logic applies at the other end. Applause rarely fades gradually. It persists until a small number of people stop, at which point others follow in quick succession. The length of applause, then, tells us less about how moved people were by the music and more about how long social pressure kept them participating.

At the Max Planck Institute for Human Development, researchers have studied how humans coordinate under uncertainty. Their work shows that when individuals lack strong personal judgments, as is often the case at conferences or speeches, they rely heavily on social cues. Applause becomes a form of collective sense-making. Instead of asking “Did I like this?”, people ask, “What do others think I should do?”

Applause as a script

Political settings make this structure especially visible. At the University of Amsterdam, Renardel de Lavalette analysed parliamentary debates and found that the vast majority of applause is triggered by specific rhetorical devices. Praise of one’s own group, affirmation of shared values, or criticism of an opponent reliably prompt clapping. Detailed policy discussion, by contrast, rarely does. Applause in these settings functions less as evaluation and more as affirmation of identity.

The polite applause at Davos looks less like a verdict and more like a negotiation. The audience was international, time-conscious and acutely aware of norms. A long overrun strained patience. Rhetorical cues that bring raucous cheers at Trump rallies – self-congratulation, grievance, insider language – land differently in a room where shared identity is thin. The applause that followed was sufficient to meet the basic social obligation, but no more.

So if applause is structured and social, can it be actively invited?

An essay on public speaking and audience responses published by Cambridge University Press, and the research of IBM’s Zhe Liu, Fostering User Engagement: Rhetorical Devices for Applause Generation Learnt from TED Talks suggests that it can. They have identified rhetorical patterns that reliably induce applause. These patterns are not accidental, but function as coordination devices, helping audiences solve the problem of when to clap.

Techniques to get hands clapping

One common technique is the use of contrastive framing: setting up a clear “before and after” or “us and them” distinction that resolves neatly at the end of a sentence. Audiences learn, often unconsciously, that such resolution points are safe moments to respond. 

Another is the strategic pause. A brief silence after a declarative statement signals completion and invites collective action. Without that pause, people hesitate, unsure whether clapping would interrupt the speaker.

Researchers also highlight the role of rhythm and repetition. Short, balanced phrases with predictable cadence make it easier for audiences to anticipate an endpoint. When listeners know where a sentence is going, they are better prepared to act together. This is one reason applause often follows slogans, tricolons, or neatly packaged summaries, and not complex explanations.

These techniques are less about manipulation than about coordination. Applause is a collective act, and collective acts require shared timing. When speakers fail to provide clear cues, audiences are left guessing so many choose silence over the risk of clapping at the wrong moment. 

The same research sheds light on the awkwardness of stopping. Applause creates its own coordination problem at the endwith each individual waiting for others to stop first. In some settings, speakers help by stepping forward, resuming speech, or explicitly acknowledging the applause. In others, the absence of such signals leads to applause that lingers uncomfortably, driven less by enthusiasm than by mutual hesitation.

What experienced audiences reward

So what should speakers do if they genuinely want to win hearts and minds, rather than just a noisy ending? The research points away from tricks and towards fundamentals. 

Respect for time matters more than many realise. Overrunning imposes a cost on the audience, and that cost is often repaid through cooler responses. 

Clarity matters because cognitive overload dampens social contagion. When people are struggling to follow an argument, they are less likely to look up and notice who else is clapping.

Authenticity matters too, perhaps most of all. Audiences are remarkably good at detecting when applause is being solicited rather than earned. Exaggerated pauses, repeated self-praise, or theatrical appeals for validation may work with friendly crowds, but they tend to fall flat with experienced audiences. In professional settings, people prefer to feel that applause is optional, not expected.

There is also something to be said for letting applause happen where it will, and not forcing it where it won’t. The research from Uppsala and Amsterdam suggests that once a speaker aligns with the norms and identities of a room, collective response takes care of itself. When that alignment is missing, no amount of rhetorical elbowing will fix it.

When the speaker does the clapping for you

Which brings us back to Davos, and to a final observation. There is a peculiar irony in spending a large portion of a speech congratulating oneself. It is, after all, a form of self-applause. The problem is that audiences tend to notice. And when a speaker does most of the clapping for themselves, the rest of the room often decides, quite reasonably that its own contribution can be brief.