New research shows that the superior colliculus, a primitive brain region, can independently interpret visual information. This challenges long-held beliefs that only the cortex handles such complex computations. The discovery highlights how ancient neural circuits guide attention and perception, shaping how we react to the world around us.
Itch has an important role as a somatosensory defensive mechanism. In this Review, Sun synthesizes CNS circuits underlying itch signal processing and its modulation in the spinal cord, transmission of processed itch information to the brain for encoding, and evoked sensory and affective components from the perception of itch.
Paul Thagard is Distinguished Professor Emeritus of Philosophy at the University of Waterloo and a Fellow of the Royal Society of Canada, the Cognitive Science Society, and the Association for Psychological Science. His work focuses on cognitive science, philosophy of mind, and the philosophy of science and medicine.
Check out his recent book, \.
Mayo Clinic researchers have developed a new tool that can estimate a person’s risk of developing memory and thinking problems associated with Alzheimer’s disease years before symptoms appear.
The research, published in The Lancet Neurology, builds on decades of data from the Mayo Clinic Study of Aging—one of the world’s most comprehensive population-based studies of brain health.
The study found that women have a higher lifetime risk than men of developing dementia and mild cognitive impairment (MCI), a transitional stage between healthy aging and dementia that often affects quality of life but still allows people to live independently. Men and women with the common genetic variant, APOE ε4, also have a higher lifetime risk.
Speaking multiple languages could slow down brain ageing and help to prevent cognitive decline, a study of more than 80,000 people has found.
The work, published in Nature Aging on 10 November1, suggests that people who are multilingual are half as likely to show signs of accelerated biological ageing as are those who speak just one language.
“We wanted to address one of the most persistent gaps in ageing research, which is if multilingualism can actually delay ageing,” says study co-author Agustín Ibáñez, a neuroscientist at the Adolfo Ibáñez University in Santiago, Chile. Previous research in this area has suggested that speaking multiple languages can improve cognitive functions such memory and attention2, which boosts brain health as we get older. But many of these studies rely on small sample sizes and use unreliable methods of measuring ageing, which leads to results that are inconsistent and not generalizable.
“The effects of multilingualism on ageing have always been controversial, but I don’t think there has been a study of this scale before, which seems to demonstrate them quite decisively,” says Christos Pliatsikas, a cognitive neuroscientist at the University of Reading, UK. The paper’s results could “bring a step change to the field”, he adds.
They might also “encourage people to go out and try to learn a second language, or keep that second language active”, says Susan Teubner-Rhodes, a cognitive psychologist at Auburn University in Alabama.
Having too many fat cells can lead to low-grade, body-wide inflammation that underlies brain aging.
Chronic venous insufficiency due to obesity may impair cognitive function.
It’s never too late to positively impact brain aging by losing weight.
Mind wandering, confusion, and a reduced ability to focus thoughts are classic early symptoms of obesity related cognitive decline.
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