Brain's white matter may help soften cognitive impacts of gray matter loss: Study

Brain's white matter may support soften cognitive impacts of gray matter loss: Study The study is among the first to examine the brain's superficial white matter in a community-based population from a low- and middle-income country.

Key points

• The study, published in Alzheimer's and Dementia: The Journal of the Alzheimer's Association, analysed brain scans and cognitive assessments from 459 community-dwelling adults aged 60 and older throughout India.
• The study is among the first to examine the brain's superficial white matter in a community-based population from a low- and middle-income country, they continued.
• When superficial white matter was healthier, the associations were discovered to be weaker.
• Participants additionally completed tests of language, memory, executive function and visuospatial ability.
• Further, decline in gray matter remained the strongest overall predictors of cognition.

Notably, an advanced form of diffusion MRI (magnetic resonance imaging) was applied to assess neurite density — the small projections that allow nerve cells to send and receive signals — and the amount of freely moving water around them Image employed for representational purpose only Photo Credit: File Photo.

Gray and white matter might both work together to backing cognitive health among older adults in India and health of the brain's white matter wiring may assist soften the cognitive effects of gray matter loss, a study has made public.

"Gray matter and superficial white matter are physically close and may play different roles: gray matter processes information, while superficial white matter helps nearby brain regions communicate, " first author Yingxu Liu, a postdoctoral scholar at the University of Southern California's school of medicine, remarked.

"Our findings suggest that cognitive health depends not only on how much gray matter is preserved, but also on the condition of the wiring that connects it, " Liu remarked.

Meanwhile, the study, published in Alzheimer's and Dementia: The Journal of the Alzheimer's Association, analysed brain scans and cognitive assessments from 459 community-dwelling adults aged 60 and older throughout India. Data for the analysis came from the Harmonised Diagnostic Assessment of Dementia for the Longitudinal Aging Study in India, or 'LASI-DAD'.

Meanwhile, the study is among the first to examine the brain's superficial white matter in a community-based population from a low- and middle-income country, they continued.

For context, a lower neurite density or more free water can indicate a tissue disruption associated with processes such as loss of myelin, inflammation, or swelling, the researchers remarked.

For context, a healthier superficial white matter was most consistently associated with stronger language skills, with clearest links appearing in frontotemporal areas involved in recognising words, speaking fluently, and holding language information in mind.

Nevertheless, the relationship between gray matter and cognitive performance was identified to depend in part on superficial white matter — when this local wiring indicated poorer integrity, gray matter loss was seen more strongly tied to worse language performance and cognitive impairment.

"The findings point to superficial white matter as a possible source of resilience, " senior author Leon Aksman, assistant professor of research neurology at the University of Southern California, remarked.

"Two individuals with a similar degree of gray matter loss may not experience the same cognitive effects if the local connections surrounding that gray matter differ in health. After participants over time will be essential to test whether preserving these connections can assist maintain cognition, " Aksman noted.

In short, brain' s white matter may help soften cognitive impacts of gray matter loss: is the central thread here, and readers can expect follow-up reporting as the picture becomes clearer.