Most people do hear phantom sounds when placed in a very quiet environment, but not everyone, and what they hear is not the same thing as chronic tinnitus. The most widely cited experiment on this question dates to 1953 and found that 94 percent of normal-hearing adults reported hearing buzzing, ringing, or hissing after sitting in a soundproof room. More recent studies have produced somewhat lower numbers, and the gap between “hearing something in silence” and “having tinnitus” turns out to be surprisingly important for understanding how the brain processes sound in general.
What Happens When Normal-Hearing People Sit in Silence
The classic experiment by Heller and Bergman placed 80 people with normal hearing in a soundproof room and asked them to report anything they heard. Ninety-four percent said they heard at least one phantom sound, typically a buzzing, ringing, or humming.1PubMed Central. Tinnitus aurium in normally hearing persons That number became one of the most repeated statistics in audiology, and it is still routinely cited to reassure people that hearing things in silence is “normal.”
More recent work has largely confirmed the finding but brought the percentage down a bit. A 2008 study that deliberately modeled itself on the original Heller and Bergman design found that 83 percent of participants reported at least one sound when no external stimulus was present. When a visible loudspeaker was placed in the room, the figure rose to 92 percent, though the loudspeaker was turned off the entire time. The researchers concluded that suggestive cues played only a minor role and that the sounds people heard were genuinely generated internally.2PubMed. Tinnitus aurium in persons with normal hearing: 55 years later
A 2022 study using an anechoic chamber found a somewhat lower figure: 74 percent of participants reported perceiving at least one sound. About half heard a single sound, while the rest reported two or more distinct phantom percepts, including sizzling noises, pure tones, whistling, and buzzing.3PubMed Central. Fear influences phantom sound percepts in an anechoic room The variation across studies probably reflects differences in room design, how long subjects sat in silence, and how the questions were asked. But the broad pattern is consistent: somewhere between three-quarters and nearly all people with normal hearing will hear phantom sounds if you put them in a quiet enough room for a few minutes.
Why Your Brain Creates Sound When There Is None
Your auditory system does not simply wait for sounds and relay them upward like a microphone connected to a speaker. Even in complete silence, the nerve fibers running from your inner ear to your brain are firing spontaneously. These fibers maintain a baseline rate of random electrical activity all the time, whether or not any sound is present.4PubMed Central. Maturation of Spontaneous Firing Properties after Hearing Onset in Rat Auditory Nerve Fibers: Spontaneous Rates, Refractoriness, and Interfiber Correlations In your everyday life, actual sounds easily overwhelm this background neural chatter, and your brain ignores it. But take away the real sounds and you are left with nothing but that low-level noise, which the brain can then interpret as a faint tone, a hiss, or a buzz.
On top of that spontaneous firing, the brain actively adjusts its sensitivity based on how much input it is receiving. When the auditory signal from the cochlea drops, as happens in a very quiet room, the central auditory system compensates by turning up its internal gain, essentially amplifying whatever neural activity remains. This mechanism is called central gain enhancement, and it has been well documented in both animal models and humans. The paradox is that reduced input from the ear leads to increased activity in the brainstem and auditory cortex.5PubMed Central. Central gain control in tinnitus and hyperacusis It is as if someone turned down the volume on the world and the brain responded by cranking its internal amplifier to maximum, making even the faintest internal signals audible.
This gain mechanism is not a glitch. It is a feature that probably evolved to help detect faint sounds in threatening environments. But in the artificial silence of a soundproof chamber, it means the brain is working hard to hear something, and it will find something to hear even if the only available signal is its own neural noise.
How Earplugs Can Temporarily Create Tinnitus
You do not actually need a soundproof room to experience this effect. A study that had 44 normal-hearing participants wear an earplug in one ear for several days found that 30 of them, roughly two-thirds, reported tinnitus by the end of the deprivation period.6Neuroscience. Earplug-induced changes in acoustic reflex thresholds suggest that increased subcortical neural gain may be necessary but not sufficient for the occurrence of tinnitus The tinnitus went away after the earplugs were removed. This strongly supports the central gain model: reduce the input, and the brain turns up the volume enough to make phantom sounds perceptible.
What was especially revealing is that not everyone in the earplug study developed tinnitus, even though all of them experienced the same reduction in sound input. The researchers measured changes in subcortical neural gain and concluded that increased gain appeared necessary for tinnitus to emerge but was not sufficient on its own. Something else, likely involving individual differences in how the brain filters and appraises internal signals, determined whether a given person actually heard a phantom sound.
Why Not Everyone Hears Sounds in Silence
If 74 to 94 percent of people hear phantom sounds in quiet rooms, that leaves a meaningful minority who report hearing nothing at all. The reasons appear to involve several layers of the auditory and emotional processing system.
The brain has built-in noise filters that operate through feedback loops between the auditory cortex and subcortical structures like the thalamus. These circuits are involved in deciding which sounds deserve conscious attention and which get classified as irrelevant background. The system is not static; it depends on context, expectation, and even a listener’s mental state.7PubMed Central. Noises on-How the Brain Deals with Acoustic Noise Some people’s brains may simply be better at classifying internally generated noise as unimportant and keeping it below conscious awareness, even when external sounds are removed.
Emotional state also plays a role. The 2022 anechoic chamber study found that fear influenced whether participants reported phantom sounds, with more fearful participants being more likely to perceive them.3PubMed Central. Fear influences phantom sound percepts in an anechoic room This aligns with what researchers know about the limbic system’s involvement in tinnitus. The brain regions responsible for assigning emotional significance to sensations, including parts of the frontal cortex and the striatum, appear to act as a kind of appraisal network that determines whether internally generated sounds reach awareness. In people with chronic tinnitus, these circuits show measurable differences from people without tinnitus.8PubMed Central. Auditory-limbic interactions in chronic tinnitus: challenges for neuroimaging research
Attention itself matters at a surprisingly physical level. When you focus your auditory attention, the brain actually reduces physiological noise in the ear canal through efferent nerve activity. Essentially, the cochlear amplifier is dampened when you are concentrating on listening, which paradoxically can make phantom sounds less prominent.9PubMed Central. Selective attention reduces physiological noise in the external ear canals of humans. I: auditory attention People differ in their baseline attentional style, and those differences may influence who does and does not hear phantom sounds in quiet rooms.
The Difference Between Silence-Induced Sounds and Clinical Tinnitus
Hearing a faint ringing in a silent room is a common and generally harmless experience, but it is not the same thing as having tinnitus in any clinically meaningful sense. The sounds people report in anechoic chambers tend to be quiet, non-distressing, and noticed only because there is nothing else to listen to. Clinical tinnitus, by contrast, persists in everyday environments, can be loud enough to interfere with conversation or sleep, and is often accompanied by emotional distress.
One of the key differences is what is happening in the ear itself. Many people who develop chronic tinnitus despite having a “normal” audiogram turn out to have subtle cochlear damage that standard hearing tests miss. Research has shown that tinnitus patients with normal audiograms often have a significantly reduced output from primary auditory nerve fibers, even though the brainstem signal that follows appears normal. This pattern, where the initial nerve signal is weak but the central response is compensated upward, provides direct evidence of hidden hearing loss and the central gain mechanism working in tandem.10PubMed Central. Tinnitus with a normal audiogram: physiological evidence for hidden hearing loss and computational model
This kind of hidden damage is called cochlear synaptopathy: the connections between hair cells and nerve fibers are degraded even though the hair cells themselves remain intact. The result is that the standard hearing test, which measures the quietest sounds you can detect at each frequency, comes back normal, but the system’s ability to transmit a full signal under challenging conditions is compromised.11The Egyptian Journal of Otolaryngology. Effectiveness of auditory measures in the diagnosis of cochlear synaptopathy and noise-induced hidden hearing loss: a case–control study Specialized testing can detect this damage. One study found dead regions in the inner hair cells in 75 percent of tinnitus patients who had normal standard audiograms, suggesting that the tinnitus was driven by real physical damage the standard test simply could not see.12PubMed Central. Assessment of Hidden Hearing Loss in Normal Hearing Individuals with and Without Tinnitus
So when a healthy person hears a faint hum in a soundproof room, the central gain mechanism is likely amplifying normal spontaneous neural activity. When a person with chronic tinnitus hears ringing in their kitchen, the same gain mechanism is amplifying an abnormally impoverished signal from a subtly damaged cochlea. The brain process is similar; the underlying cause is different.
How the Body Can Influence Phantom Sounds
One of the stranger aspects of tinnitus is that many people can change their phantom sound by moving their head, jaw, or eyes. This is called somatic modulation, and it reinforces the idea that tinnitus is not simply a problem of the ear. In most cases, these maneuvers make the tinnitus louder or shift its pitch rather than making it quieter. The typical change is modest, but some patients report that clenching their jaw or turning their head can double or triple the perceived loudness of their tinnitus.13PubMed Central. Head, Neck, and Eye Movements That Modulate Tinnitus
This happens because the auditory brainstem receives input not only from the cochlea but also from nerves carrying information about head position, jaw tension, and eye movement. When the auditory input is reduced or the central gain is elevated, these non-auditory signals can bleed into the auditory processing stream and be interpreted as sound. It is a reminder that tinnitus is a brain phenomenon more than an ear phenomenon, even when the trigger starts in the cochlea.
Do Children Experience This Too
Phantom auditory perceptions are not limited to adults. A study of children found that about 28 percent reported hearing phantom sounds, including continuous ringing or humming, pulsatile tinnitus, and other auditory percepts.14SciELO – Brazil – Are parents aware of their children’s hearing complaints?. Are parents aware of their children’s hearing complaints? That is a lower rate than what anechoic chamber studies find in adults, but it is worth noting that the children in this study were not placed in soundproof rooms. They were simply asked about their everyday experiences, and many parents were unaware their children had any hearing complaints at all.
The fact that children report phantom sounds without the extreme silence of a laboratory setting suggests that the phenomenon is not just an artifact of artificial quiet. Some degree of internally generated auditory perception seems to be part of normal human neurology across all ages. Children may simply be less likely to mention it because they assume everyone hears the same things, or because they lack the vocabulary to describe it.
How Resting Brain Activity Differs in Tinnitus
Neuroimaging research has begun to map how the brains of people with chronic tinnitus differ from those without it, even at rest. One finding is that people with tinnitus show decreased connectivity between certain auditory regions and the frontal and temporal areas of the brain before any sound stimulation occurs. In other words, the brain’s resting-state network is wired differently in tinnitus patients, not just when they are listening to something but as a baseline condition.15PLOS ONE. Tinnitus alters resting state functional connectivity (RSFC) in human auditory and non-auditory brain regions as measured by functional near-infrared spectroscopy (fNIRS)
This is one of the clearest indications that chronic tinnitus is not just a louder version of what everyone hears in a quiet room. The brain reorganizes its communication patterns in ways that sustain the phantom sound even in the presence of other sounds. In a healthy person, returning to a normal sound environment switches off the silence-induced percepts almost immediately. In someone with chronic tinnitus, those percepts have become embedded in the brain’s default operating mode.
Aging and the Auditory Nerve
Age-related changes to auditory nerve fibers add another dimension. Research on aging animals has shown that spontaneous firing rates decline with age, and that the mix of fiber types changes, with low-spontaneous-rate fibers being lost in the higher-frequency range.16PubMed. Cochlear aging disrupts the correlation between spontaneous rate- and sound-level coding in auditory nerve fibers These low-rate fibers are the ones most important for hearing in noisy environments. Their loss could be one of the reasons tinnitus becomes more common with age: as the cochlea sends a progressively degraded signal, the central gain mechanism compensates more aggressively, and the likelihood of phantom sound perception rises.
This also helps explain why many older adults describe tinnitus that seems to “come out of nowhere” even though their hearing test looks fine for their age. The standard audiogram captures only a slice of what the auditory system is doing. The gradual erosion of specific fiber populations creates the conditions for central gain to overshoot, and once the brain habituates to the resulting phantom signal, tinnitus can become persistent.
Does Tinnitus Fill in Gaps of Silence
One question researchers have explored is whether the phantom sound of tinnitus literally fills in moments of silence the way a visual illusion might fill in a blind spot. If tinnitus worked this way, people with tinnitus should have trouble detecting a brief silent gap in a continuous sound, especially when that sound is pitched near their tinnitus frequency. In practice, though, this does not seem to happen. A study testing gap detection found that tinnitus patients could detect silent gaps in noise on 81 to 89 percent of trials, even when the noise was matched to their tinnitus pitch, and their performance was no worse at the tinnitus frequency than at frequencies one octave above or below.17PubMed Central. Does tinnitus “fill in” the silent gaps?
This is a useful finding because it means tinnitus does not blind people to actual silence the way you might expect. The phantom sound and the real auditory world seem to be processed somewhat independently. It also complicates any simple model in which tinnitus is just the brain “filling in” missing input. The mechanism is more nuanced than a simple fill-in-the-blank operation: the brain generates a phantom percept, but it can still detect the absence of real sound on top of it.
Spontaneous Otoacoustic Emissions
Some of the sounds people hear in silence may not be generated by the brain at all but by the ear itself. The outer hair cells of the cochlea are mechanically active; they amplify incoming sounds by physically vibrating. In some people, this amplification process generates faint sounds that radiate back out through the ear canal. These are called spontaneous otoacoustic emissions, and they are generally associated with healthy outer hair cell function.18Journal of Otology. Spontaneous Otoacoustic Emissions in Tinnitus Patients They are measurable with a sensitive microphone and tend to be very faint, but in quiet conditions a person might become aware of them as a soft, high-pitched tone.
Not everyone produces detectable spontaneous otoacoustic emissions. They are more common in women than in men and tend to decline with age. In most people who have them, the sounds are too quiet to be noticed in everyday life. But in the hush of a soundproof room, they could contribute to what participants report hearing. For people who do notice them, spontaneous otoacoustic emissions are essentially a real acoustic signal, not a phantom percept, even though no external sound is present. They represent the ear making sound rather than just detecting it.