Depression
How does brain activity during body awareness relate to alexithymia?
Open access · cc by · source: Europe PMC
Healthy people with difficulty describing emotions show altered brain activity during body-awareness tasks, a pattern that is disrupted in individuals with major depression.
Key findings
Healthy controls with higher scores for difficulty describing feelings showed decreased activity in the supragenual anterior cingulate cortex during the body awareness task. When healthy participants were split into a high-alexithymia group of 14 and a low-alexithymia group of 16, the high-alexithymia group showed increased activity in the insula. However, the 16 depressed patients did not show this increased insula activity despite having similarly high difficulty describing feelings.
Methodology
The researchers scanned 30 healthy control participants and 16 patients with major depressive disorder using functional magnetic resonance imaging. During the scans, participants completed a task where they silently counted their own heartbeat for trials lasting 9 to 13 seconds, which was repeated 48 times per condition. Participants also filled out the 20-item Toronto Alexithymia Scale to measure their difficulty identifying and describing emotions.
Limitations
Because this is a correlational study using functional neuroimaging, it cannot establish whether changes in brain activity directly cause alexithymia or depressive symptoms. Additionally, all depressed patients were taking medication, which could confound the observed neural differences. Finally, the division of healthy controls into high and low categories was based on a small sample, which may not capture the true continuous nature of personality traits.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Healthy individuals with high alexithymia exhibit altered neural processing in the insula and anterior cingulate cortex during interoceptive attention, a pattern that is notably disrupted in patients with major depressive disorder.
Evidence for the claim as stated.
In healthy individuals, alexithymia is linked to altered brain activity during interoceptive body-awareness tasks, but this typical neural pattern is absent in individuals with major depressive disorder.
Evidence for the claim as stated.
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