infrasound stress – New lab results suggest inaudible infrasound can raise stress hormones and make people feel more irritated—without them realizing it’s present.
A long-standing mystery in popular culture—why some people feel “something is there” in older buildings—may have a measurable physiological trigger.
Misryoum reports that a new study tested whether infrasound. a very low-frequency sound often too low for human hearing. could affect people’s stress response in a way that resembles the emotional atmosphere associated with hauntings.. The focus was not on proving spirits. but on whether the body reacts to environmental sounds we don’t consciously perceive.
The experiment took place in a controlled lab setting with 36 participants seated alone.. Each person was exposed to one of two audio environments: calming music resembling what some people associate with yoga settings. or “more unsettling ambient music.” Critically. half of the participants were also exposed to infrasound delivered through hidden subwoofers—meaning the sound was present without being readily detectable by the participants’ ears.
Researchers tracked two core outcomes: how participants felt during exposure, and whether their bodies showed signs of stress.. The body’s normal stress chemistry includes cortisol, a hormone that can be measured from saliva.. That allowed the team to connect subjective feelings—like irritation or unease—with an internal biological response rather than relying only on self-report.
The results were striking.. When infrasound was turned on. participants reported feeling more irritated and unsettled across the board. no matter whether the background music was intended to be calming or unsettling.. In parallel, cortisol levels rose significantly in response to the infrasound condition.. Equally important, none of the participants could reliably tell when infrasound was present.
Misryoum notes that this combination—strong changes in emotion and measurable stress chemistry. alongside an inability to consciously detect the stimulus—supports the idea that humans can respond physiologically to infrasound without awareness.. In other words. people may feel that something is “wrong” or uncomfortable in a room even if they can’t point to a sound they can hear.
That matters because “haunting” experiences are typically treated as either purely psychological or purely supernatural.. The study’s framing sits in between: it suggests a mundane mechanism could amplify an emotional state.. The researchers emphasized that infrasound is unlikely to be the sole cause of hauntings.. Instead, they argue it could be one factor among several, including psychological dynamics such as expectation and suggestibility.
This is where older buildings come into play.. Many historic structures contain features that can create subtle vibration or low-frequency rumbling—loose pipes. drafty ventilation. aging machinery. or shifting materials.. If some of those systems generate infrasound. then people who already expect the place to be eerie may interpret the body’s stress reaction as confirmation that something supernatural is happening.. Misryoum frames this as a “puzzle piece” model rather than a single-cause explanation.
The broader implication is that experiences commonly labeled as paranormal may sometimes reflect interactions between environment and biology.. Infrasound, even when inaudible, appears capable of nudging stress systems, which can shape attention, mood, and threat perception.. Under the right expectations—or under conditions like darkness. isolation. or prior stories told about a location—that physiological discomfort could be interpreted as fear or presence.
For future research, the key question is not just whether infrasound affects people, but how the effects vary by context.. How does intensity, duration, or the sound’s frequency profile change the stress response?. Do individuals who are more prone to anxiety react differently?. And how much would infrasound need to combine with psychological expectation to produce the kind of certainty people often describe in haunting narratives?
Misryoum’s takeaway is clear: the study does not “solve” hauntings, but it strengthens a testable, physical explanation for part of what people report—one that begins with stress biology and ends with emotion, sometimes before anyone realizes what stimulus they’re responding to.