Visual Snow Syndrome (VSS) is often difficult to explain because its symptoms are persistent, complex, and not always visible to others. Many people with VSS experience continuous visual static, along with symptoms such as light sensitivity, afterimages, difficulty seeing in the dark, and other visual disturbances.
Although research into VSS has grown in recent years, many questions remain about what is happening in the brain and why symptoms continue over time. A new study published in The Journal of Headache and Pain offers further insight into the brain activity patterns that may be involved in Visual Snow Syndrome.
The article, Unmasking the noise: aberrant cortical oscillations in visual snow syndrome, examined resting brain activity in people with VSS using electroencephalography, commonly known as EEG. The researchers found patterns of altered brain rhythms that may help explain why VSS is considered a neurological condition, rather than simply a visual or eye-related problem.
Understanding Brain Rhythms in VSS
The brain is constantly active, even when a person is resting. This activity includes electrical rhythms, sometimes called oscillations, that help different brain regions communicate and process information.
In this study, researchers examined these rhythms while participants were resting with their eyes closed. They looked at different frequency bands, including delta, theta, alpha, beta, gamma, and higher-frequency activity.
For people who are not familiar with these terms, frequency bands can be thought of as different “speeds” of brain activity. Each band may be associated with different types of processing, attention, sensory regulation, or communication between brain networks.
The study found that individuals with VSS showed increased lower-frequency activity, especially in delta, theta, and alpha bands, across several regions of the brain. These changes were seen in areas involved in visual processing, attention, sensory integration, and higher-level regulation.
VSS May Involve More Than the Visual Cortex
It is noted in the research, Visual Snow Syndrome does not appear to involve only the primary visual areas of the brain.
The study found changes across a wider network of regions, including parietal, occipital, frontal, sensorimotor, and related cortical areas. These regions are involved in functions such as visual perception, attention, sensory filtering, and the brain’s ability to decide which information is important.
This may help explain why VSS can feel so overwhelming for many people. The symptoms are visual, but the condition may involve broader sensory and attentional networks that influence how visual information is processed and filtered.
For individuals with VSS, this can be validating. It supports the idea that VSS is not imagined, exaggerated, or simply caused by anxiety. Instead, the findings add to a growing body of evidence suggesting that VSS is associated with measurable differences in brain function.
The Role of Migraine
Migraine is common among people with Visual Snow Syndrome, which has made it challenging for researchers to determine whether certain findings are related to VSS itself, migraine, or both.
This study addressed that question by comparing people with VSS to healthy controls, and also comparing people who had both VSS and migraine to people who had migraine alone.
The researchers found that people with VSS and migraine still showed distinct patterns of brain activity when compared with people who had migraine without VSS. This suggests that Visual Snow Syndrome has neurological features that are not fully explained by migraine alone.
This does not mean migraine is unrelated to VSS. Many people experience both conditions, and they may share some overlapping mechanisms. However, the study supports the view that VSS and migraine are not the same condition.
Why the Parietal Cortex May Matter
One of the key areas highlighted in the study was the parietal cortex. The parietal cortex helps the brain manage where attention is directed and how sensory information is organized. It may also help suppress irrelevant visual input so that the brain can focus on what matters.
The study found that certain alpha and theta activity patterns in parietal regions were especially important in distinguishing VSS from migraine-only participants. This may suggest that altered activity in these areas plays a role in the persistent perception of visual noise, afterimages, light sensitivity, or difficulty filtering visual information.
More research is needed before these findings can be translated into clinical tools or treatments. However, identifying specific brain regions and activity patterns may help guide future studies.
Machine Learning and Potential Brain Signatures
The researchers also used machine learning models to examine whether patterns of brain activity could help distinguish people with VSS from healthy controls, and people with VSS plus migraine from people with migraine alone.
The models were able to identify distinct spectral features associated with VSS. Some models reached strong classification performance in the research setting.This does not mean that machine learning or EEG can currently diagnose VSS in routine clinical care. At this stage, these tools are part of research.
However, the findings may help scientists better understand the physiological patterns associated with VSS. Over time, this type of research could contribute to more objective markers, improved diagnosis, and more targeted treatment studies.
What This Could Mean for Future Treatment Research
The study discusses the possibility that certain brain activity patterns, especially in parietal regions, could become targets for future treatment research. Potential areas for investigation may include neuromodulation approaches, such as transcranial magnetic stimulation, neurofeedback, or other methods aimed at helping regulate brain activity. However, these possibilities remain investigational.
For many people living with Visual Snow Syndrome, one of the hardest parts of the condition is feeling misunderstood. Symptoms may be constant, difficult to describe, and invisible to others. Research like this helps provide a scientific framework for what patients experience. It supports the idea that VSS involves measurable changes in brain activity and that these changes may extend across visual, attentional, and sensory networks.
It also reinforces the importance of continued research. While there is still much to learn, each study adds another piece to the larger picture of VSS. Greater scientific understanding may lead to improved education, better clinical recognition, and more informed conversations between patients, families, and healthcare professionals.