By Rick Nauert PhD Senior News Editor
Reviewed by John M. Grohol, Psy.D. on February 15, 2011
Despite the frequently comparable benefits of either of the modalities, and the often documented adjunctive benefit of using both approaches at the same time, researchers currently have a better understanding of how medications affect the neurological function of the brain.
To balance this representation, a new study looked at how psychotherapy alters the brain in patients suffering from social anxiety disorder. A team of Canadian psychological scientists set out to discover how the brain changes when psychotherapy is helping someone recover — in this case from social anxiety disorder.
Medication and psychotherapy both help people with this common disorder, marked by overwhelming fears of interacting with others and expectations of being harshly judged. But research on the neurological effects of psychotherapy has lagged far behind that on medication-induced changes in the brain.
“We wanted to track the brain changes while people were going through psychotherapy,” said McMaster University Ph.D. candidate Vladimir Miskovic, the study’s lead author.
To do so, the research team used electroencephalograms, or EEGs, which measure brain electrical interactions in real time. They focused on the amount of “delta-beta coupling,” which elevates with rising anxiety.
The study recruited 25 adults with social anxiety disorder from a Hamilton, Ontario clinic. The patients participated in 12 weekly sessions of group cognitive behavior therapy, a structured method that helps people identify—and challenge—the thinking patterns that perpetuate their painful and self-destructive behaviors.
Two control groups—students who tested extremely high or low for symptoms of social anxiety—underwent no psychotherapy.
The patients were given four EEGs—two before treatment, one halfway through, and one two weeks after the final session.
The researchers collected EEG measures of the participants at rest, and then during a stressful exercise: a short preparation for an impromptu speech on a hot topic, such as capital punishment or same-sex marriage; participants were told the speech would be presented before two people and videotaped.
In addition, comprehensive assessments were made of patients’ fear and anxiety.
When the patients’ pre- and post-therapy EEGs were compared with the control groups’, the results were revealing: Before therapy, the clinical group’s delta-beta correlations were similar to those of the high-anxiety control group and far higher than the low-anxiety group’s.
Midway through, improvements in the patients’ brains paralleled clinicians’ and patients’ own reports of easing symptoms. And at the end, the patients’ tests resembled those of the low-anxiety control group.
“We can’t quite claim that psychotherapy is changing the brain,” cautioned Miskovic. For one thing, some of the patients were taking medication, and that could confound the results. But the study, funded by the Ontario Mental Health Foundation, is “an important first step” in that direction—and toward understanding the biology of anxiety and developing better treatments.
The work might also alter perceptions of therapy. “Laypeople tend to think that talk therapy is not ‘real,’ while they associate medications with hard science, and physiologic change,” said Miskovic.
“But at the end of the day, the effectiveness of any program must be mediated by the brain and the nervous system. If the brain does not change, there won’t be a change in behavior or emotion.”
Their findings are published in Psychological Science, a journal of the Association of Psychological Science.