There is evidence that people with a history of major depression have lower connectivity between two particular brain areas when recalling feelings of guilt. Now, new research suggests that it is possible to strengthen this brain connectivity and increase self-esteem with a new type of neurofeedback training.

Using a functional MRI scanner, researchers have shown that neurofeedback training can increase self-esteem in those with depression.

A team of researchers from Brazil and the United Kingdom demonstrated that just one session of neurofeedback training using functional MRI (fMRI) can produce such a result.

They report the findings of the proof-of-concept study in a recent NeuroImage: Clinical paper.

Neurofeedback is a technique that allows people to learn how to influence their own brain activity by observing a representation of that activity in real time.

Electroencephalography (EEG) neurofeedback has been around since the 1970s. Neurofeedback using fMRI, which uses imaging to look at brain activity, is a more recent development.

Like EEG neurofeedback, fMRI neurofeedback is noninvasive, but it differs from the EEG approach in that it offers greater resolution of the brain region under observation.

Previous study examined connectivity

In an earlier study, the same team had already used fMRI to show that when people with a history of major depressive disorder (MDD) experience feelings of guilt, or “excessive self-blame,” they have lower connectivity between the right anterior superior temporal (ATL) and the anterior subgenual cingulate (SCC) regions of the brain.

Connectivity between brain regions has to do with the amount of connectedness that they have in order to exchange information. In the case of the ATL and SCC, their connectivity relates to the interpretation of social behavior.

The researchers refer to the patterns of lower connectivity between the ATL and SCC that they saw as “brain signatures.”

“The brain signature of excessive self-blame was discovered in patients with whose symptoms had remitted, suggesting it could precede the symptoms of depression, making people more vulnerable to the disorder,” says lead study author Dr. Roland Zahn.

Dr. Zahn is a reader in neurocognitive bases of mood disorders at King’s College London in the U.K.

He and his colleagues wished to take the previous findings a step further and address the question of whether people could use fMRI neurofeedback to alter their brain signature.

How the team conducted the study

For the study, the researchers enrolled 28 people with a history of MDD and randomly put them into two groups: an active intervention group and a control intervention group.

For reasons of safety, they chose to involve people whose MDD symptoms were in remission, so as not to risk any current depressive episode getting worse following the treatment.

Both groups could see fMRI neurofeedback of their ATL-SCC connectivity activity in real time on a color computer screen. The computer represented the level of ATL-SCC connectivity in the form of a thermometer.

During the feedback sessions, both groups recalled a memory of a situation in which they had felt guilt towards other people. They also repeated the task for feelings of indignation.

The instruction to both groups was to try and increase the level of the thermometer by changing their feelings as they recalled the event.

“The marker was a thermometer that, when filled to the top, would be a signal that the participants were doing well in the training,” Dr. Zahn explains.

There were differences between the groups, however. In the intervention group, the thermometer level went up only if the ATL-SCC connectivity increased; in the control group, it only went up if the connectivity stayed the same, or stabilized.

Rise in ATL-SCC connectivity and self-esteem

Because the study design took the form of a double-blind trial, neither the participants nor their instructors knew whether they were in the active intervention group or the control (stabilization) group.

“The rationale for stabilization as a control intervention,” write the authors, “was to provide feedback from the same brain regions as in the active group whilst being engaged in the same psychological task, which avoids differences in the psychological aspects of the intervention in both groups.”

Also, such a design rules out feedback that might come from a brain region that is not relevant and “could thus create a mismatch between neurofeedback signal and psychological task,” they add.

When the participants completed the thermometer task for the indignation condition, the thermometer “reinforced stabilization of the preceding degree of correlation between the ATL and SCC in both intervention groups.”

This was because the outcome measure that the researchers used was the “increase in correlation between ATL and SCC fMRI signal for guilt relative to indignation.”

Although both groups experienced neurofeedback for the same amount of time, the fMRI results showed that ATL-SCC connectivity only increased in the active intervention group.

In addition, from analyzing before and after responses to psychological questionnaires, the team saw an increase in self-esteem in the active intervention group but not in the control group.

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