TL;DR: In rats trained to spot a brief flash of light, a drug that blocks one nicotine-type receptor (alpha-7) made them better at telling flash from no flash, even with distractions. Drugs that boosted the same receptor made them worse at high doses. Key Findings Alpha-7 blocker helped: Moderate doses of MLA improved detection, mostly …
TL;DR: In 86 people from one hospital in China, those with Parkinson’s and mild thinking problems showed changes in how water moves through parts of the hippocampus, a memory center. The hippocampus was not measurably smaller, suggesting a diffusion scan may pick up changes that size alone misses. Key Findings No size difference: None of …
TL;DR: Old mice given nicotine in their drinking water for 3 months had more cells carrying two key markers of brake-like neurons in the hearing part of the brain, reaching young-adult levels. The study did not test hearing, and it is no reason for anyone to take up nicotine. Key Findings Markers fell with age: …
TL;DR: Old female mice given plasmalogens, a fat found in brain cell membranes, 5 days a week for 2 months did better on a memory maze than old mice given water. Their brains also showed more synapses and less inflammation, but this is a mouse study, not a human trial. Key Findings Better maze memory: …
TL;DR: In mice, two visual areas of the brain kept signals they agreed on going longer and let mismatched signals fade faster. The two-way wiring between the areas appears to be what makes this happen. Key Findings Two areas recorded at once: 194 neurons in the main visual area and 228 in a higher one, …
TL;DR: Readers slowed down more for surprising but sensible sentence endings than for impossible ones, and remembered those surprising words better. When people expect some nonsense, they seem to brush it off quickly. Key Findings 38 German-speaking students read sentences word by word. Slowest on surprising but sensible endings, faster on expected and on impossible …
TL;DR: When 35 adults got fake feedback saying they were making more mistakes, they slowed down slightly, and they slowed most when told the buttons were faulty. Errors blamed on the machine also triggered a stronger brain “alert” signal than errors blamed on themselves. Key Findings Slower with fake errors: 571 ms with true feedback, …
TL;DR: Healthy adults normally react a bit slower to a spot that recently caught their attention, a habit that helps attention move on. A single dose of a drug that boosts dopamine, and another that blocks it, both weakened this habit compared with placebo. Key Findings 28 healthy adults, each tested on three visits. Both …
TL;DR: Young mice carrying the human APOE4 gene, the biggest genetic risk factor for Alzheimer’s, had overexcited memory circuits months before any memory trouble showed up. Removing APOE4 from their neurons returned those cells to normal. Key Findings Early warning spikes: Young APOE4 mice had more abnormal electrical spikes in parts of the hippocampus. Spikes …
TL;DR: Across 27 trials in older adults with mild memory and thinking problems, tai chi and qigong classes lifted overall thinking scores by a moderate amount compared with no exercise. More weekly minutes were not always better, and the dosing patterns still need testing. Key Findings 27 randomized trials, 2,034 people: All aged 60+ with …
