A new study published in the Proceedings of the National Academy of Sciences found people with a high family risk of developing depression had less matter on the right side of their brains. The finding was similar to that found in brains with Alzheimer’s disease according to the researchers.
Brain scans revealed a 28% thinning in the right cortex in people who had a family history of depression compared with people who did not. Findings were based on scans of 131 people aged 6 to 54 with and without a family history of depression.
The thinning on the right side of the brain was only related to a family predisposition to depression. People who were actually depressed also had thinning on the left side of the cortex.
The authors suggest that having a thinner cortex may increase the risk of depression by disrupting a person’s ability to decode and recall social and emotional cues from other people. Subjects who had a thinner right cortex did less well on tests of memory and attention.
Findings suggest that a thinning right cortex relates to a predisposition to depression and to cognitive impairment.