Having a stroke ages a person's brain function by almost eight years, new research finds - robbing them of memory and thinking speed as measured on cognitive tests.

In both black and white patients, having had a stroke meant that their score on a 27-item test of memory and thinking speed had dropped as much as it would have if they had aged 7.9 years overnight. For the study, data from more than 4,900 black and white seniors over the age of 65 was analyzed by a team from the University of Michigan U-M Medical School and School of Public Health and the VA Center for Clinical Management Research. 

Credit: University of Michigan

A study in mice reveals that hormones that dictate a female's attraction towards males do so in part by controlling her sense of smell. 

The investigators analyzed female mice at various stages of the ovulation cycle and found that when a female is not ready for reproduction, her hormones (specifically progesterone) block her ability to sense the smell of male pheromones.

These hormones diminish during ovulation, eventually allowing a female mouse to smell a potential partner. When ovulation ends, the cycle repeats, and she is again rendered "odor-blind" to males.

Scientists have found that a drug candidate with anticancer potential can be activated by one of the body's natural responses to cellular stress.

Once activated, the agent can kill prostate cancer cells.

The study highlights the potential of the natural compound called leinamycin E1 (LNM) for development as a "prodrug," a medication converted through a metabolic process in the body to become an active therapy.

A study of parental age and autism risk including 
5.7 million children in five countries
found increased autism rates among the children of teen moms and among children whose parents have relatively large gaps between their ages. It also confirmed that older parents are at higher risk of having children with autism. 

Though previous studies identified a link between advancing parental age and autism risk, many aspects of the association remained unclear. For example, some studies found increased risk with older dads but not moms. The goal of the new study was to determine whether advancing maternal or paternal ages independently increase autism risk, and to what extent each might do so.

Imaging lung cancer requires both precision and innovation and clinical positron emission tomography (PET) imaging reates advanced whole-body parametric maps, which allow quantitative evaluation of tumors and metastases throughout the body, according to research announced at the 2015 Annual Meeting of the Society of Nuclear Medicine and Molecular Imaging (SNMMI). 

Real-time brain scans coupled with a machine-learning algorithm can reveal whether a person has memory of a particular subject, but with a little bit of concentration people can easily hide their memories from the computer.

Memory is obviously important, in areas like eyewitness testimony, medicine and even marketing. Programs that can read a person's brain scan data and surmise whether that person is experiencing a memory could be important for those reasons.

But with just a little bit of coaching and concentration, subjects are easily able to obscure real memories, or even create fibs that look like real memories, on brain scans. For cooperative subjects, things are good, but for high-stakes situations knowing they can be spoofed is important.