People with body-image disorders process ‘big picture’ visual information abnormally
People suffering from body dysmorphic disorder, or BDD — a severe mental illness characterized by debilitating misperceptions that one appears disfigured and ugly — process visual information abnormally, even when looking at inanimate objects, according to a new UCLA study. The study compared 14 BDD patients, both men and women, with 14 healthy controls. Researchers used a type of brain scan called functional MRI (fMRI) to scan subjects while they viewed digital photographs of houses that were either unaltered or altered in ways to parse out different elements of visual processing.
The researchers found that the BDD patients had abnormal brain activation patterns when viewing pictures of the less-detailed houses: The regions of their brains that process these visual elements showed less activation than the healthy controls. In addition, the more severe their BDD symptoms, the lower the brain activity in the areas responsible for processing the image holistically.
“The study suggests that BDD patients have general abnormalities in visual processing,” Feusner said. “But we haven’t yet determined whether abnormal visual processing contributes as a cause to developing BDD or is the effect of having BDD. So it’s the chicken-or-the-egg phenomenon.
