Listening to specific music frequencies is associated with distinct biological changes in students experiencing exam-related stress. A recent study published in Brain and Behavior suggests that a 528 Hertz frequency tends to promote proteins associated with brain health, while a 432 Hertz frequency triggers a cellular stress response. Despite these biological shifts, a brief listening session does not immediately change cognitive performance on attention tasks.
University students often face intense pressure and anxiety during exam periods. This stress affects both their physical bodies and their mental focus. To cope with this pressure, many students turn to simple relaxation methods, such as listening to music. Research indicates that music can influence the nervous system, potentially easing stress and supporting overall brain health.
“University students face a very real spike in stress during exam periods, and we were interested in whether a simple, low-cost intervention like listening to music could be tracked using non-invasive salivary biomarkers,” said รmmรผ Gรผlลen Bozok, an assistant professor of physiology at Ankara Medipol University in Turkey.
Bozok and her colleagues wanted to explore whether specific sound frequencies have distinct biological impacts. Sound is measured in Hertz, which refers to the number of sound waves per second. Standard music on the radio is typically tuned to 440 Hertz. Alternative tunings like 432 Hertz and 528 Hertz are popular in relaxation tracks and meditation playlists.
“We chose to compare two commonly discussed music tunings as experimental auditory stimuli, mainly to see whether different conditions would be associated with any measurable differences in stress- and plasticity-related markers,” Bozok said.
To measure these effects, the authors focused on three specific proteins found in human saliva. The first is brain-derived neurotrophic factor. This protein acts like a fertilizer for the brain. It helps brain cells grow, survive, and form new connections, which supports learning and memory.
The second protein is cyclic AMP response element-binding protein. This molecule helps turn on the genes required for forming long-term memories and absorbing new information. Both of these proteins are associated with brain plasticity, which is the brain’s ability to adapt, heal, and change over time.
The third protein is glucose-regulated protein 78. This particular molecule acts as an indicator of cellular stress, specifically within the protein-making factories of the cell. When a cell becomes overworked or damaged, the levels of this protein rise to help fix misfolded proteins and protect the cell from dying.
The researchers designed their study to observe how short-term exposure to different music tunings affects these three specific proteins. They wanted to evaluate the biological changes happening beneath the surface during a high-stress academic period. They also aimed to see if any biological changes would translate to immediate improvements in focus and attention just before an exam.
The study included 162 healthy university students between the ages of 18 and 25. The authors recruited these volunteers from a university in Turkey and conducted the experiment during official exam periods to capture natural stress. The participants were randomly divided into three equal groups of 54 students each.
The first group served as a control condition and sat in silence with no music. The second group listened to instrumental music tuned to a frequency of 528 Hertz. The third group listened to instrumental music tuned to a frequency of 432 Hertz.
For the experimental groups, participants listened to their assigned music through headphones for exactly twenty minutes. These sessions took place roughly one hour before the students were scheduled to take a university exam. All participants sat in identical environmental conditions to ensure outside visual or auditory factors did not affect the results.
Immediately after the twenty-minute session, the researchers collected saliva samples from each participant. They used a passive drooling technique to gather the fluid. This method allowed them to preserve the samples and measure the exact concentrations of the three target proteins.
“Saliva is appealing because it’s easy to collect and well tolerated,” Bozok told PsyPost. Using saliva provides a painless and simple way to check biological markers without needing to draw blood.
After providing the saliva samples, each student completed a mental test called the Stroop Color-Word Test. This psychological task evaluates selective attention, mental flexibility, and the ability to process conflicting information. During the test, a medical doctor presented the participants with color words printed in mismatched ink colors.
For example, the student might see the word “blue” written in red ink. The participants first read the plain text words aloud as quickly as possible. Then, they were asked to look at the mismatched words and name the color of the ink instead of reading the word itself. The researchers recorded the time it took for the students to complete each part of the test to assess their cognitive processing speed.
The biological analyses revealed distinct differences between the three groups of students. Students who listened to the 528 Hertz music maintained high levels of brain-derived neurotrophic factor, which were comparable to the control group. They also exhibited the highest levels of the memory-building protein compared to all other participants.
In addition, the 528 Hertz group displayed lower levels of the cellular stress marker than the control and 432 Hertz groups. This specific pattern suggests that a 528 Hertz frequency promotes a biological state associated with brain growth. It also appears to reduce the overall stress burden on the cells.
The participants exposed to the 432 Hertz music displayed a different biological response. Their saliva samples contained significantly lower levels of the brain-growth protein compared to the other groups. These students also showed the lowest levels of the memory-building protein.
Instead of promoting brain growth markers, the 432 Hertz group showed significantly higher levels of the cellular stress marker. Their stress protein levels were higher than both the control group and the 528 Hertz group. The authors suggest this elevation might indicate a protective cellular response.
The body might be trying to manage environmental stress by ramping up the production of proteins that fix damaged cells. It acts as an adaptive mechanism to preserve cellular balance during a demanding academic event. This suggests the 432 Hertz music might trigger a biological defense process.
Despite these varied biological responses, the mental performance test showed no significant differences among the three groups. The students in the control group, the 528 Hertz group, and the 432 Hertz group all took roughly the same amount of time to complete the reading and color-naming tasks.
“The most interesting point for us was the dissociation: we saw differences at the level of salivary biomarkers, yet no corresponding difference in the cognitive task,” Bozok explained. “That’s a useful reminder that an acute biochemical signal does not automatically imply a behavioral or cognitive effect, and it kept us cautious in how we interpreted the findings.”
The biological changes happening at the cellular level do not immediately translate to faster brain processing speeds. Brain plasticity and memory formation often require sustained or repeated stimulation to result in noticeable behavioral changes. “The honest takeaway is a modest one: in our sample, the different music conditions were associated with somewhat different patterns in salivary biomarkers, but these differences did not translate into any measurable difference in cognitive (Stroop test) performance,” Bozok said.
Readers might assume that listening to 432 Hertz music is inherently harmful due to the elevated stress markers observed in the study. An increase in this stress protein does not necessarily mean the cells are being damaged. It could simply reflect an adaptive process where the body prepares to defend and repair its cells against external pressures.
Similarly, people should not overstate the benefits of the 528 Hertz tuning. “I would caution readers against concluding that any particular frequency ‘boosts the brain,’ reduces stress, or heals anything; our data do not support claims like that,” Bozok warned. “We deliberately avoided framing the specific tunings as ‘healing frequencies,’ and we’d encourage readers to keep the same healthy skepticism we tried to apply ourselves.”
“If there is a practical message, it’s the familiar one that music can be a reasonable, accessible way to relax during stressful periods; the specific biology we looked at needs much more work before anyone draws firm conclusions,” Bozok added.
The study features some limitations that provide context for the findings. “This was a small, short-term pilot study in a narrow group (healthy university students aged 18-25), with only a single 20-minute exposure, so the results don’t generalize to other populations or to longer-term use,” Bozok told PsyPost.
Another limitation involves the use of saliva to measure brain-related proteins. “Crucially, salivary levels of these proteins should not be read as a direct window into the brain; the link between what we measured in saliva and what happens in the central nervous system is an assumption, not something we demonstrated,” Bozok cautioned.
“The markers we examined are not yet established salivary readouts, so the absolute values should be interpreted with caution and confirmed with validated methods,” Bozok noted. The scientists also did not account for the students’ personal music tastes. “We did not control for participants’ individual musical preferences or backgrounds either. For all these reasons we frame the work explicitly as hypothesis-generating.”
Future research should track participants over longer periods to see if extended listening habits lead to noticeable changes in mental performance. “We’d like to see whether any of these signals hold up under more rigorous conditions: larger and more diverse samples, longer or repeated exposure, validated assays, and ideally complementary measures such as blood markers or neuroimaging,” Bozok said.
By studying diverse age groups and using advanced tools, researchers can build a more comprehensive understanding of how specific sound frequencies shape human biology. “The aim is to test whether these preliminary associations are real and meaningful, rather than to confirm them,” Bozok concluded, noting that she hopes the research will be viewed as a small, preliminary step rather than a definitive finding.
The study, “Acute Music-Frequency Exposure Modulates Salivary Stress and Neurotrophic Markers in Young Adults: A Randomized Controlled Trial,” was authored by รmmรผ Gรผlลen Bozok, Gรผlbahar Bรถyรผk รzcan, Bรผlent Bayraktar, and Doฤukan รzen.