The psychology of campfires: why fire calms us
Everyone knows the feeling. A controlled study of 226 adults found something more specific — the fire calmed people with its sound on, and a muted fire didn’t do so as consistently.
General information, not medical advice. Talk to a doctor about any health concern.
Nobody has to be taught to stare into a fire. Put a group of people around one and the conversation slows, the shoulders drop, and somebody eventually says the thing everyone is thinking: we could sit here all night. It is such a universal experience that it barely registers as strange — which is exactly what makes it worth examining.
There is a real experiment behind this feeling, and it found something more specific than “fire is nice.” It found that the sound matters more than most people assume.
In a controlled study of 226 adults, watching a fire with its crackling sound produced consistent decreases in blood pressure — and the effect grew with longer viewing. Watching a muted fire did not produce the same consistent drop. The leading explanation is that hearth and campfire relaxation is multisensory and social, not simply visual. The research is small and comes from a single researcher, but the direction is consistent with what everyone already feels.
The experiment
The anthropologist Christopher Lynn set out to test something rarely checked directly: whether fire is actually relaxing, or whether we just say so. Across three studies, 226 adults were shown different conditions in a randomised crossover design: a simulated fire with no sound, a fire with its sound, and controls including a blank screen and a static, upside-down image of a fire. Blood pressure was measured before and after.1
The results pointed in one direction. There were consistent decreases in blood pressure in the fire-with-sound condition, and the effect was stronger with longer exposure.1
The muted fire and the control conditions did not produce the same calming; in one study, diastolic pressure even rose slightly in the control condition.
Two other findings are easy to overlook and quietly important. The relaxation also interacted with absorption, the trait of becoming deeply immersed in an experience, and with prosociality, the disposition toward warmth with others, though these effects were not consistent across the analyses.1 Fire, in other words, does not calm everyone identically.
Why the sound matters
If the effect were simply about flickering light, the muted fire should have worked as well. It did not work as consistently, which suggests the crackle matters. The study did not test the sound on its own, though, so it cannot say the sound does the work alone.
A fire’s crackle is broadband, covering a wide sweep of frequencies, which may help mask the sudden noises that would otherwise pull your attention, though the evidence for broadband masking is thin2 — the same mechanism described in the colors of noise.
We think the crackle also works because it is irregular but bounded: pops arrive unpredictably, yet always within a familiar range, so your threat-detection system registers activity without finding anything to escalate. And it is slow and unhurried, with no rhythm demanding to be followed, which is the quality behind why slow music calms you.
Broadband, so it may mask. Irregular, so it never becomes a rhythm you track. Bounded, so nothing in it ever escalates. That is our interpretation, not something the study tested.
Fire also gives the eye something to do that requires nothing of it. Flames move continuously and never repeat, which holds attention without asking for interpretation. Psychologists call this soft fascination — the effortless attention that natural scenes invite, and the reason a fire and a stream and a swaying tree all feel restful in the same particular way.
The evolutionary story, held loosely
The interpretation Lynn offers is that hearth relaxation was worth having. Controlled fire extended the day, deterred predators and made food edible. But it also created something new: a place where a group had to sit together, at length, without a task. If calmer, more tolerant individuals fared better in that setting, then a relaxation response to firelight could have been advantageous.1
It is an appealing idea, and worth flagging as what it is: a hypothesis consistent with the data, not a demonstrated fact. Evolutionary explanations for present-day feelings are notoriously easy to construct and difficult to test. What the study establishes is the effect. Why we have it is a further question the data cannot settle.
This is a small body of research — three studies by a single researcher, using a fire on a screen rather than a real one. Blood pressure moves for many reasons, including simply sitting still. In two of the three studies, blood pressure happened to start higher before the fire-with-sound session, which may exaggerate the drop, and the longer sessions were tested on different people. Treat this as a good explanation for a real feeling, not as a clinical finding, and never as a substitute for medical care if your blood pressure is a concern.
Recreating it without a fire
Most of us cannot light a hearth on a Tuesday. The study offers a useful hint about what to reproduce, since the ingredient that mattered was the one people usually leave out.
Keep the sound. A muted fire is the condition that did not work as consistently. If you are playing a fireplace loop, the crackle is not ambience for the visuals — on this evidence it is part of what works.
Give it time. The 15-minute sessions in the third study showed larger drops than the 5-minute sessions in the first two. Two minutes of fire on a phone screen is not the same intervention as half an hour with it running in the room.
Make it the thing you are doing. Participants were asked to watch, not to do anything else. Fire as a background window behind your inbox is not what was tested. Fire as the thing you are doing is.
The muted fire did not give the same consistent drop. If you are running a fireplace video with the sound off, you are reproducing that version.
Dim everything else. Firelight is warm and low. Bright evening light suppresses melatonin, so warm, low light suits the body’s wind-down.
We built The Ember Hearth around that finding: fire as light and sound, generated live, with crackles timed at random.
What the study cannot tell us is why the pull is so strong. It only confirms that it is real, that the sound is part of it, and that people have been sitting in front of this particular noise for a very long time.
Frequently asked questions
In a study of 226 adults, watching a simulated fire with sound produced consistent decreases in blood pressure, with stronger effects over longer viewing. A muted fire did not produce the same consistent drop. It is a small body of research from a single researcher rather than a clinical finding.
Several qualities combine: the crackle is broadband sound that may help mask sudden noises, it is irregular but predictable enough never to alarm, and flames hold the eye without demanding interpretation. In the research, fire with its sound on worked better than a muted fire, though sound alone was not tested.
The research itself used simulated fire, so a video is close to what was tested — provided the sound is on. With the sound off, the effect was weaker and less consistent.
One hypothesis is that firelight created long, taskless social gatherings in human history, favouring a relaxation response tied to sociability. In the study, effects interacted with prosociality and absorption. It is a plausible explanation rather than a proven one.
Sources
- Lynn, C. D. (2014). Hearth and campfire influences on arterial blood pressure: defraying the costs of the social brain through fireside relaxation. Evolutionary Psychology, 12(5), 983–1003. (Randomised crossover design; 226 adults across three studies comparing muted fire, fire-with-sound and control conditions; consistent blood-pressure decreases in the fire-with-sound condition, stronger with longer stimulus, with interactions for absorption and prosociality.) pubmed.ncbi.nlm.nih.gov
- Riedy, S. M., Smith, M. G., Rocha, S. & Basner, M. (2021). Noise as a sleep aid: a systematic review. Sleep Medicine Reviews, 55, 101385. (Describes broadband masking as purported, and rates the evidence that continuous noise improves sleep as very low quality.) pubmed.ncbi.nlm.nih.gov