Depression: When the brain’s seat of guilt malfunctions, and why some people blame themselves for everything
Posted by Xeno on June 8, 2012
Crushing guilt is a common symptom of depression, an observation that dates back to Sigmund Freud. Now, a new study finds a communication breakdown between two guilt-associated brain regions in people who have had depression. This so-called “decoupling” of the regions may be why depressed people take small faux pas as evidence that they are complete failures.“If brain areas don’t communicate well, that would explain why you have the tendency to blame yourself for everything and not be able to tie that into specifics,” study researcher Roland Zahn, a neruoscientist at the University of Manchester in the United Kingdom, told LiveScience.Zahn and his colleagues focused their research on the subgenual cingulated cortex and its adjacent septal region, a region deep in the brain that has been linked to feelings of guilt. Previous studies have found abnormalities in this region, dubbed the SCSR, in people with depression.
… The resulting scans showed that while the SCSR and the anterior temporal lobe activate together in both guilt and indignation in healthy brains, the brains of the once-depressed individuals functioned quite differently. During feelings of indignation, the SCSR-anterior temporal lobe linkage worked fine. But during feelings of guilt, the regions failed to sync up so neatly.
Participants who were most prone to blame themselves for everything showed the greatest communication gaps between these regions, Zahn and his colleagues reported on June 4 in the journal Archives of General Psychiatry. Importantly, once-depressed participants didn’t notice feeling any differently when they read the guilt and indignation sentences, suggesting that this breakdown in communication is not felt consciously.
The researchers can’t yet say if pre-existing brain problems cause the communication breakdown, or if the depression itself causes this troubling pattern. Fortunately, Zahn said, the coupling of the SCSR and the anterior temporal lobe is known to be influenced by learning.
“It’s likely to be the sign of something that happened because of learned experiences, plus, of course, biology,” Zahn said.
That means there is hope that people prone to depression could learn to overcome their guilty tendencies. Zahn and his colleagues are now collaborating with Jorge Moll, a scientist at the D’Or Institute for Research and Education in Rio de Janeiro, to try to train people’s brains. The researchers are developing a program that will allow people to watch their brain activities in real time. If it works, patients will see their brain activation change as they try to alter their emotions. That feedback is important, given that once-depressed participants don’t consciously realize that they’re turning social molehills into mountains of self-blame.
“It’s something in the brain activation that you don’t have conscious access to,” Zahn said.