5 Things Brain Imaging Studies Tell Us About Social Anxiety Disorder

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Social Anxiety Disorder and Brain Imaging Research

Brain imaging research is useful to understand social anxiety.
Social anxiety can be understood through brain imaging research. ALFRED PASIEKA/SCIENCE PHOTO LIBRARY / Getty Images

Brain imaging studies have the potential to uncover the reasons why some people develop social anxiety and others do not, as well as the types of treatment options that may be most helpful—based on individual characteristics.

Below are five brain imaging studies that have advanced our knowledge of social anxiety disorder (SAD).

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Some People with SAD Respond Better to CBT Than Others

Brains of patients with social anxiety disorder.
Brains of patients with social anxiety disorder. Courtesy: Gabrieli Lab, MIT

If you've received cognitive-behavioral therapy (CBT) and/or medication for social anxiety disorder, it is likely that the choice of treatment was based on the perspective of the professional who administered it, more so than characteristics of you as a patient.

That could all change, with research investigating the usefulness of "neuromarkers" in predicting which patients will respond better to certain types of treatments. These areas of the brain are identified during scans known as functional magnetic resonance imaging (fMRI).

In a 2013 study led by John D. Gabrieli out of the Massachusetts Institute of Technology, and supported by the National Institute of Mental Health (NIMH), it was found that among 39 patients with SAD who received 12 weeks of CBT, those who more strongly reacted to angry faces (based on looking at their brain scans) showed better improvement.

This means that it may be possible to identify individuals who are more likely to respond better to CBT for social anxiety disorder.

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Meditation Can Help Those With SAD

Brain scan of social phobics during self-processing.
Brain scan of social phobics during self-processing. Photo courtesy of Philippe Goldin

In a 2009 study led by Stanford research Philippe Goldin, and published in the Journal of Cognitive Psychotherapy, it was found that 9 sessions (2 months) of mindfulness-based stress reduction (meditation directed at focusing on bodily sensations) resulted in improvements in views of the self among those with social anxiety disorder.

Individuals who with SAD who completed the MBSR program also showed improved ability to shift their thinking and focus, in particular away from the negative and toward the positive.

Based on the brain imaging conducted in the study, it appeared that brain activity in areas related to visual attention also increased. People with SAD tend to avert their gaze from things they find threatening such as other people or crowds. However, the increase in visual attention seen in this study indicated that people were "staying with the stimuls rather than running away," according to Goldin.

This research shows that meditation, and in particular MBSR, may be helpful in improving symptoms of social anxiety, particularly related to negative self views and selective visual attention.

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Exercise Can Help Those With SAD

Effect of exercise on the brain.
Effect of exercise on the brain. Photo courtesy of Dr. Chuck Hilman, University of Illinois

The human brain naturally produces a variety of chemicals including dopamine (reward), serotonin (relaxation), and endorphins (pain relief).

In a 2009 brain-imagining study led by Charles Hillman and published in the journal Neuroscience, it was found that walking improved the cognitive control of attention in preadolescent children. 

The data from the study support moderate acute exercise for increasing attention and academic performance; however, it can easily be seen how these findings could be extended to mental health in general.

Endorphins released during exercise may help to improve various brain systems necessary to overcome social anxiety disorder. For example, endorphins during exercise may help to grow brain connections. They may lead to better clarity of thinking and an improved view of the outside world. They may also stimulate better attention, which we already know (see Goldin's study above) may be important for those who tend to look away in social situations.

Therefore, the brain scans above showing the difference in brain activity with or without exercise clearly suggest many positive benefits of exercise for those with SAD.

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Social Anxiety and Introversion Are Different

Differences between the introvert and extrovert brain.
Differences between the introvert and extrovert brain. Image courtesy of blog.bufferapp.com.

A simple example of how brain imaging can help untangle social anxiety disorder may come from work on introversion versus extroversion. While introversion and social anxiety are not the same thing (introverts become overstimulated by social interaction while those with social anxiety have a fear response), understanding how brain pathways differ for different types of personalities can still be helpful.

In a 2005 fMRI study led by Michael Cohen and published in the journal Cognitive Brain Research, it was found that extroverts responded more strongly when a gamble paid off. It is argued that this is a result in differences in the reward pathways in the brains of extroverts (those who crave external stimulation).

Similarly, Hans Eysenck argued back in the 1960s that introverts naturally have a higher basic level of arousal compared to extroverts.

All of this centers on the notion that extroverts process stimuli through a shorter brain pathway that involves taste, touch, vision, and audition, while introverts use a longer pathway involving memory, planning, and problem solving.

How does this relate to SAD? The introversion/extroversion dimension seems to relate to different brain processes at a structural level; therefore, it would seem these would be hard to change. On the other hand, we know the social anxiety can improve through treatment. This just emphasizes the notion that SAD and introversion, though often confused, are not the same thing.

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Social Anxiety May Be Hereditary

The anxious brain may be hereditary.
The anxious brain may be hereditary. Image courtesy of University of Wisconsin-Madison

In a 2015 paper published in Proceedings of the National Academy of Sciences of the United States of America and led by Ned Kalin of the University of Wisconsin-Madison, it was shown that the functioning of certain areas of the brain may be related to a genetic predisposition toward an anxious temperament.

The study looked at 600 rhesus monkeys from a large multi-generational family. Using a task in which the young monkeys were faced with a threat (a stranger who did not look at them), the researchers employed high-resolution functional and structural brain imaging.

What they found was that there was overactivity in three brain areas (the prefrontal-limbic-midbrain circuit) among anxious young monkeys. 

They also determined that 35% of the variation in anxiety tendency was explained by family history.

Interestingly, the three areas of the brain that were implicated are survival-related: the brain stem (primitive brain), amygdala (fear center), and prefrontal cortex (high-level reasoning).

This study tells us that anxiety may have been genetically passed down because it held evolutionary value—that of avoiding danger.

Sources:

Cohen MX, Young J, Baek J-M, Kessler C, Ranganath C. Individual differences in extraversion and dopamine genetics predict neural reward responses. Brain Res Cogn Brain Res. 2005;25(3):851-861. doi:10.1016/j.cogbrainres.2005.09.018.

Doehrmann O, Ghosh SS, Polli FE, Reynolds GO, Horn F, Keshavan A, Triantafyllou C, Saygin ZM, Whitfield-Gabrieli S, Hofmann SG, Pollack M, Gabrieli JD. Predicting Treatment Response in Social Anxiety Disorder from Functional Magnetic Resonance Imaging. JAMA Psychiatry. January 2013. 70(1):87–97.

Fox AS, Oler JA, Shackman AJ, et al. Intergenerational neural mediators of early-life anxious temperament. Proc Natl Acad Sci USA. 2015;112(29):9118-9122. doi:10.1073/pnas.1508593112.

Goldin P, Ramel W, Gross J. Mindfulness Meditation Training and Self-Referential Processing in Social Anxiety Disorder: Behavioral and Neural Effects. J Cogn Psychother. 2009;23(3):242-257. doi:10.1891/0889-8391.23.3.242.

Hillman CH, Pontifex MB, Raine LB, Castelli DM, Hall EE, Kramer AF. The Effect Of Acute Treadmill Walking On Cognitive Control And Academic Achievement In Preadolescent​ CHILDREN. Neuroscience. 2009;159(3):1044-1054. doi:10.1016/j.neuroscience.2009.01.057.

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