Young people who experience high levels of social anxiety show a distinct pattern of increased activity in the brain’s visual centers and changes in communication. Recognizing these early neurological changes may ultimately allow doctors to detect and treat severe social anxiety before it develops fully. These findings were recently published in the journal Psychiatric research: neuroimaging.
Social anxiety disorder involves an intense and persistent fear of social situations in which you may be judged by others. This condition often begins in childhood or early adulthood and can have a serious impact on relationships, education, and quality of life. Many young people experience a similar condition known as subclinical social anxiety.
Many people become shy in new environments, but subclinical social anxiety is more than the norm. This includes a deep-seated fear of surveillance that leads to physical stress responses and the urge to avoid social gatherings altogether. Identifying the physical cause of this condition can provide legitimacy to those suffering from these overwhelming emotions.
People with subclinical social anxiety disorder face severe distress in social settings but do not meet the strict diagnostic criteria for a full-blown mental health disorder. This condition still causes ongoing difficulties in daily life and schoolwork. If we can detect the neurological signs of this anxiety early, we can prevent it from progressing to more severe psychological distress.
Fangfan Fang, a researcher at China’s Henan University of Science and Technology, led a team investigating the physical brain differences associated with this early stage of anxiety. Researchers wanted to understand how the internal wiring of the brain works differently in young people who experience high levels of anxiety in social environments. They wanted to identify physical markers in the brain that correspond to these anxious feelings.
The human brain consists of gray matter, which contains the body of nerve cells, and white matter, which forms connections between different brain regions. To understand how the brain functions, researchers look at how different areas of gray matter communicate with each other. This communication can be measured by tracking blood flow in the brain using magnetic resonance imaging.
By observing the brain at rest, scientists can learn which areas naturally communicate and how strongly connected they are. Researchers are looking at both the overall activity level of specific brain regions and the synchronized activity between different regions. They also try to determine the direction of these signals and map which brain areas are transmitting and which brain areas are receiving information.
Huang and her team recruited 26 young adults with subclinical social anxiety and 26 healthy adults of the same age and sex. Healthy participants did not report social anxiety or other emotional problems. Two participants with anxiety were later removed from the analysis because they moved their heads too much during the brain scan.
Participants underwent brain scans in a magnetic resonance imaging machine while completely still and awake. The researchers measured their brain’s spontaneous resting activity over several minutes. They then compared the brain scans of socially anxious people with those of healthy participants.
Brain scanning technology uses the magnetic properties of blood to map neural activity. When a particular area of the brain becomes more active, it requires more oxygen and increases blood flow to that area. By tracking these subtle changes in blood oxygen levels, the researchers were able to see exactly which brain networks were active at any given moment.
The researchers focused on measuring the amplitude of low-frequency fluctuations, an indicator of the strength of spontaneous brain activity. They found increased activity in a particular part of the brain called the left superior occipital gyrus. This area is located near the back of the brain and is primarily responsible for processing visual information.
This increased activity suggests that the visual processing system of people with social anxiety may be overactive. Hyperactivity in the visual center may explain why people with social anxiety are constantly on guard against social threats. They may constantly monitor their environment for negative facial expressions or critical cues from others.
The researchers then looked at how this visual cortex is connected to other parts of the brain. They looked at functional connectivity, which measures whether two areas of the brain are active at the same time. The researchers observed an unusually strong connection between the visual center and the right inferior frontal gyrus.
The inferior frontal gyrus is an area near the front of the brain that helps regulate emotions, make decisions, and monitor social behavior. Strong connections between the visual system and this emotion regulation center may reflect excessive attention to potential social threats. Even when lying awake and at rest, the socially anxious brain appears to be preparing for negative social interactions.
The researchers then analyzed the effective connectivity, which tracks the exact direction of signals traveling between brain regions. They found that the visual center sent fewer signals to the postcentral gyrus. This area of the brain processes physical sensations and helps make connections between emotional experiences and physical states.
At the same time, sensory areas were sending an increased number of signals back to visual centers. This uneven exchange of information indicates that there is confusion in the way the brain connects feelings of physical anxiety to what a person sees in the environment. A similar increase in received signal was seen from the precuneus.
The precuneus is a brain region deeply involved in introspection and personal memory retrieval. Excessive signals from the introspective center to the visual center can cause people with social anxiety to focus too much on themselves. This internal focus is a common symptom of social anxiety and causes people to become aware of their own shortcomings.
Finally, the researchers looked at the physical volume of gray matter in these brain regions. They wanted to see if structural changes in the brain were responsible for the observed functional changes. Researchers built a statistical model to test how brain structure, brain activity, and anxiety symptoms influence each other.
They found that less gray matter in the visual center was directly related to increased brain activity in the same area. This increase in brain activity predicted higher levels of social anxiety in the participants. Structural changes were not the only ones that caused anxiety, but they caused functional hyperactivity.
The researchers described this chain reaction as a fully mediated effect. Physical reduction of a brain area leads to overcompensation of its activity level. This excessive visual processing results in anxious feelings that individuals experience in social situations.
Although this study provides an initial investigation into the neurology of social anxiety, it faces several limitations. The relatively small number of participants may make it difficult to generalize the results to the broader population. The participants were also very similar in age and educational background, so the results may differ between the older and younger groups.
The researchers noted that findings correlating these brain changes with symptom severity were not statistically significant. The lack of a clear relationship may be due to the fact that all anxious participants had very similar levels of subclinical anxiety. Expanding the study to include people with a wider range of anxiety levels could clarify this dynamic.
Future studies should follow participants over a longer period of time. Observing the same people over many years could reveal whether these brain changes are stable or worsen as anxiety progresses. It will also help to see if these specific neurological markers can really predict the development of full-blown mental illness.
Advanced imaging techniques can also map the actual physical neural pathways that connect these brain regions. Understanding the precise physical wires that drive these overactive signals could open new doors to targeted psychiatric treatments. Doctors may eventually use certain treatments or non-invasive brain stimulation to calm overactive visual centers and reduce early symptoms of social anxiety.
The study, “Dysfunction of superior occipital gyrus and its mediating effect on gray matter structure in patients with subclinical social anxiety disorder,” was authored by Fangfang Huang, Shuai Ren, Yuan Huang, Yuqi Chen, MingZhu Wang, Xiaoyi Chang, Kaile Liu, Siying Guo, and Xingnuo Liu.
