Social facilitation: why other people help some work and hurt the rest

Some work feels easier with other people around. You clear a backlog of email faster in a busy café, or a dull chore finally gets done because a friend is working across the table. Other work falls apart the moment someone looks over your shoulder: a tricky calculation, a first attempt at a new tool, a paragraph you are still trying to figure out.

Psychologists have studied this for more than a century under the name social facilitation. The basic pattern is well known. What gets less attention is how small the effect is, how shaky some of the famous evidence turns out to be, and what newer research says about being watched, being monitored and working next to someone on a screen.

Short answer: social facilitation is the tendency for the presence of other people to change how well we perform. Company tends to help slightly with simple or well-practised tasks and to hurt slightly with complex or unfamiliar ones. The effect is real but small, the "help" half is less secure than the "hurt" half, and being evaluated matters more than simply having people nearby. The useful question is not whether to work alone or with others, but which tasks to bring into company and which to protect.

What is social facilitation?

Social facilitation refers to a change in individual performance caused by the presence of others, either an audience watching you or co-actors doing the same task beside you. The term covers both directions. When performance improves, researchers call it facilitation. When it gets worse, they call it social inhibition or social impairment. Textbooks usually combine them as the social facilitation effect.

Two everyday versions are worth separating:

Situation	Everyday example	What tends to happen
Audience: someone watches you work	A manager watching you present, a colleague reading your screen	Strongest effects, especially when you feel judged
Co-action: others work beside you	A shared office, a library, a co-working call	Smaller effects; comparison with others can add pressure or motivation
Monitoring: your output is recorded	Activity tracking software, keystroke or screen logging	No clear performance gain in workplace studies, and more stress
Virtual presence: a person or figure on a screen	A video call with cameras on, an on-screen character	Can produce the same pattern as a real person in the room

Social facilitation is not the same as social loafing, which is the tendency to put in less effort when your individual contribution to a group task cannot be identified. In social facilitation, your own performance is visible or at least separate. In social loafing, it is pooled and hidden.

Where the idea came from, and what the famous first study really showed

Most textbooks open with Norman Triplett's 1898 study, describing it as the first social psychology experiment and the first proof that people perform better in the presence of others. A 2012 paper by the social psychologist Wolfgang Stroebe argued that none of this holds up. He wrote that Triplett's study was not the first social psychology study or even the first study on social facilitation, that the experimental task is usually described wrongly, and that the evidence for social facilitation in it was overstated (Stroebe, 2012).

This matters for readers because the confident textbook story, "competition makes everyone faster", was never what the original data showed. The more careful account came decades later.

Zajonc's explanation: other people raise arousal

For a long time, researchers could not explain why company sometimes helped and sometimes hurt. In a 1965 paper in Science, Robert Zajonc proposed a simple answer (Zajonc, 1965). The presence of others, he argued, raises general drive or arousal. Higher arousal makes your dominant response, the one you are most likely to produce, even more likely.

• On a simple or well-learned task, the dominant response is usually correct, so arousal helps.
• On a complex or new task, the dominant response is often wrong, so arousal makes errors more likely and learning slower.

Zajonc summarised the practical implication bluntly: learning is impaired and performance of what you already know is facilitated. That is still the core idea taught today.

How strong is the evidence?

The largest classic test is a 1983 meta-analysis of 241 studies by Charles Bond and Linda Titus (Bond and Titus, 1983). As summarised in a 2020 paper in Psychological Science, it found a small facilitation effect on simple tasks (d = 0.32) and a small inhibition effect on complex tasks (d = -0.20). The presence of other individuals explained between 0.3% and 3% of the variance in performance (Halfmann, Bredehöft and Häusser, 2020).

Three things follow from those numbers:

1. The effect is small. Company does not transform anyone's performance. Skill, sleep, task design and interruptions will usually matter far more.
2. The direction depends on the task. The same room can help one task and hurt another on the same afternoon.
3. The older studies have limits. The 2020 authors pointed out that none of the 241 studies were preregistered, because preregistration did not exist yet, and that Bond and Titus themselves noted a high risk of unpublished null results for the facilitation effect.

The cockroach study, replicated

One of the most cited experiments in this area used cockroaches. In 1969, Zajonc and colleagues reported that cockroaches ran a simple straight runway faster when other cockroaches watched from behind clear walls, and ran a more complex maze slower. Because cockroaches cannot plausibly worry about being judged, the result was taken as strong support for the arousal account.

In 2020, researchers in Germany ran a preregistered direct replication with 120 cockroaches, three times the original sample (Halfmann, Bredehöft and Häusser, 2020). They noted that the original study never tested the key interaction statistically and was likely underpowered. The replication found that an audience slowed the cockroaches down on both the runway and the maze. There was no interaction with task difficulty, and the Bayes factor gave moderate evidence for no interaction. In their words, they replicated the inhibition effect but found no evidence for facilitation.

A single animal replication does not overturn decades of human research. It does suggest a cautious reading: the cost of being watched on difficult work looks more dependable than the boost on easy work.

Being watched versus simply having people nearby

After Zajonc, researchers argued about whether mere presence is enough, or whether the effect depends on feeling evaluated or on attention being pulled between the task and the people around you. Newer studies suggest attention is central, and that evaluation can change the result in surprising ways.

Presence can sharpen attention on some tasks

In the Stroop task, people name the ink colour of a word that spells a different colour, for example the word "red" printed in blue. Reading the word is the automatic, dominant response, and you have to suppress it. If arousal simply strengthens dominant responses, an audience should make the Stroop task harder. In a set of experiments, Pascal Huguet and colleagues found the opposite. Relatively unpredictable audiences, and being forced to compare yourself with a slightly better co-actor, both reduced Stroop interference (Huguet, Galvaing, Monteil and Dumas, 1999). The authors read this as support for an attentional view: other people can narrow attention onto the task in a way that helps you resist an automatic response.

Evaluation can make capable people choke

Later work by the same research group looked at being watched by someone who evaluates you. In a 2015 study, being watched by the experimenter led people with higher working memory capacity to perform worse on a classic test of executive control (Belletier and colleagues, 2015). A 2019 follow-up found that being watched by evaluative others undermined proactive control, the forward-planning style of control that people with higher working memory capacity tend to rely on (Belletier and colleagues, 2019).

The practical lesson is uncomfortable. The people most capable of doing demanding work well can be the ones most affected when that work is performed under evaluation. These are laboratory tasks with student samples, so treat them as a reason to pay attention to evaluation pressure rather than as a precise prediction about your job.

Does social facilitation happen on a screen?

Many people now work "with" others through a screen: video calls, co-working sessions, shared documents. A study at Georgia Tech asked participants to solve anagrams, mazes and modular arithmetic problems alone, with a person in the room, or with a virtual human shown on a computer screen (Park and Catrambone, 2007). Compared with working alone, the virtual human condition improved performance on easy tasks and worsened it on difficult ones, the same pattern seen with a real person. The authors warned that an ever-present on-screen figure might make learning and performance difficult on challenging tasks.

This was a single lab study with an early virtual character, not a test of modern video calls. Still, it is a reasonable caution: a camera-on call is unlikely to feel neutral, and the effect may depend on how evaluated you feel.

What about workplace monitoring?

If being watched helps simple work, it is tempting to assume that monitoring employees would raise output. The best current evidence says otherwise. A 2023 meta-analysis of electronic performance monitoring pooled 94 independent samples with 23,461 people (Ravid, White, Tomczak, Miles and Behrend, 2023). It found no evidence that monitoring improves worker performance. Monitoring was associated with increased stress, regardless of how it was done. Organisations that monitored more transparently and less invasively saw more positive attitudes from workers.

Monitoring software is not the same as a colleague sitting nearby, and the meta-analysis does not show that monitoring harms performance on average. But it does show that the classic "audience boosts simple work" finding does not translate into a reliable productivity tool once surveillance becomes part of the job.

When company helps and when it hurts

Putting the research together gives a working rule of thumb. It is a hypothesis to test on your own work, not a law.

Task	Likely effect of company	Why
Routine admin, filing, clearing email	Neutral to slightly helpful	Well-practised responses; some evidence for a small speed gain
Starting a task you keep avoiding	Often helpful in practice	Presence adds structure and a start time; direct evidence is limited
Learning a new tool or skill	Likely to hurt, especially if watched	Dominant responses are still wrong; evaluation adds pressure
Complex writing, analysis or problem solving	Mixed; watch for a cost	Laboratory evidence for small impairment on complex tasks
Performing a skill you know well in front of others	Can go either way	Familiar skills may benefit, but evaluation can trigger choking
Work under tracking or close monitoring	No reliable gain; more stress	Meta-analytic evidence across 94 samples

How to use social facilitation on purpose

Sort tasks before choosing where to work

Before a session in a shared space, list what you plan to do and mark each item as familiar or new. Bring the familiar items into company. Keep the new or complex ones for a quieter block. If you use time blocking, this can be as simple as labelling blocks "with people" or "alone". If the real problem is that you can't start a task you already know how to do, company is a reasonable thing to try first.

Lower evaluation, keep presence

The research suggests that feeling judged does more damage than simply having people nearby. If you co-work with someone, agree that nobody watches anyone's screen and nobody comments on progress mid-session. On video, try cameras on and microphones off, or cameras off for the hard parts. Our guide to body doubling covers how to set up these sessions.

Practise new skills alone first

If you have to perform a new skill in front of others, such as a presentation or a live demo, rehearse it alone until the correct response becomes the dominant one. Zajonc's account predicts that well-learned performance holds up better under an audience than half-learned performance.

Watch the comparison trap

Working beside someone who is faster can sharpen attention, as in the Stroop studies, or it can add pressure. If you notice yourself glancing at what others are doing, that is attention leaving the task. Our page on context switching explains why those small glances add up.

Do not confuse monitoring with support

If you lead a team, the monitoring evidence is a reason to be careful. Visible, purposeful, minimally invasive check-ins are more likely to be accepted than surveillance, and surveillance has not been shown to raise performance.

A two-week test

Because the average effect is small and varies by person and task, your own data is more useful than a general rule.

1. Pick two task types. One familiar (for example, processing email or editing) and one demanding (for example, drafting something new or analysing data).
2. Alternate settings. Over two weeks, do each task type some days alone and some days with company: a shared office, a café, a library or a co-working call. Keep the session length the same.
3. Measure output, not feelings. Count what you finish, the time to finish and the errors you catch later. Feelings of productivity and actual output often differ, as our article on multitasking shows.
4. Note evaluation. After each session, rate from 1 to 5 how watched or judged you felt.
5. Compare. Look for a pattern by task type, not an overall winner. Many people find company helps them start and finish routine work but does little for their hardest work.

Where Zone fits

Zone is a pair of EEG earbuds with an app that shows app brain states, such as Locked In, In Flow, Drifting, Running Hot and Depleted. The earbuds read signals through an in-ear EEG array, explained in our article on in-ear EEG. If you wear Zone during the two-week test, you can set your session summaries from solo sessions beside those from sessions with company, for example to compare how long the app showed Locked In or how often it showed Running Hot. Our guide to focus tracking explains more. Treat these as app estimates, not a measure of arousal, evaluation pressure or performance, and keep your output, timings and error counts as the main evidence. Zone does not diagnose, treat, or manage any medical condition.

Common questions

What is social facilitation in simple terms?

It is the tendency for people to perform a little better on easy or familiar tasks, and a little worse on hard or new tasks, when other people are present.

What is an example of social facilitation?

Clearing routine email faster in a busy office than alone at home is a typical example. The reverse is fumbling a new software tool while a colleague watches.

Who discovered social facilitation?

Norman Triplett's 1898 study is usually credited, although later analysis argues it was not the first study on the topic and that its evidence was overstated. Robert Zajonc's 1965 drive account is the explanation most people learn today.

What is the difference between social facilitation and social loafing?

Social facilitation concerns individual performance that others can see or that sits alongside theirs. Social loafing is reduced effort when your contribution is pooled into a group result and cannot be identified.

Is social facilitation always positive?

No. The name is misleading. Presence tends to hurt performance on complex or unfamiliar tasks, and in a recent replication only the impairment effect held up.

Does working on a video call cause social facilitation?

Possibly. One lab study found that a virtual human on screen produced the same pattern as a real person: better on easy tasks and worse on hard ones. Modern video calls have not been studied in the same way.

Sources

1. Zajonc, R. B. (1965). Social facilitation. Science, 149(3681), 269 to 274. PubMed record
2. Bond, C. F., Jr., and Titus, L. J. (1983). Social facilitation: a meta-analysis of 241 studies. Psychological Bulletin, 94(2), 265 to 292. PubMed record
3. Stroebe, W. (2012). The truth about Triplett (1898), but nobody seems to care. Perspectives on Psychological Science, 7(1), 54 to 57. PubMed record
4. Halfmann, E., Bredehöft, J., and Häusser, J. A. (2020). Replicating roaches: a preregistered direct replication of Zajonc, Heingartner, and Herman's (1969) social-facilitation study. Psychological Science, 31(3), 332 to 337. PubMed record
5. Huguet, P., Galvaing, M. P., Monteil, J. M., and Dumas, F. (1999). Social presence effects in the Stroop task: further evidence for an attentional view of social facilitation. Journal of Personality and Social Psychology, 77(5), 1011 to 1025. PubMed record
6. Belletier, C., Davranche, K., Tellier, I. S., Dumas, F., Vidal, F., Hasbroucq, T., and Huguet, P. (2015). Choking under monitoring pressure: being watched by the experimenter reduces executive attention. Psychonomic Bulletin and Review, 22(5), 1410 to 1416. PubMed record
7. Belletier, C., Normand, A., Camos, V., Barrouillet, P., and Huguet, P. (2019). Choking under experimenter's presence: impact on proactive control and practical consequences for psychological science. Cognition, 189, 60 to 64. PubMed record
8. Park, S., and Catrambone, R. (2007). Social facilitation effects of virtual humans. Human Factors, 49(6), 1054 to 1060. PubMed record
9. Ravid, D. M., White, J. C., Tomczak, D. L., Miles, A. F., and Behrend, T. S. (2023). A meta-analysis of the effects of electronic performance monitoring on work outcomes. Personnel Psychology, 76(1), 5 to 40. DOI