New Research Suggests Watching TV is Linked to Memory Problems in Older Adults

iStock.com/BakiBG
iStock.com/BakiBG

Television has always been a hypnotic diversion, and the rise of streaming content has made passing hours in front of the set easier than ever. But all of that tube time might have consequences later in life. According to new research published in Scientific Reports, the more TV older adults watched, the greater the potential for lower scores on verbal memory tests.

The data was drawn from the English Longitudinal Study of Ageing, a long-term examination of UK participants aged 50 and older that solicits information on health and lifestyle habits. The study, conducted by researchers at University College London, looked at the self-reported television viewing habits of 3590 adults in 2008 and 2009. These subjects also took a brief verbal memory test that prompted them to recall 10 common words that had just been recited to them. They were asked to repeat the words both immediately and after a brief delay. Semantic fluency was also tested, with subjects asked to offer words in a given subject, like animals, in under a minute.

The process was then repeated six years later. Participants who watched more than 3.5 hours of television daily had worse scores on the verbal memory test than those who watched less. Researchers also found that as television viewing went up, scores went down. This, the study suggests, is enough to link TV watching with cognitive decline.

Because sedentary behavior by itself was not found to correlate with the lowered memory scores, it may not be the physical passivity of viewing that’s at fault. The paper’s authors note that television promotes an alert brain, but not necessarily a focused one. Other screen-based stimuli like video games may be better for preserving or enhancing cognition. Researchers also theorized the potential for TV-induced stress to affect recall. Violent scenes can induce concern or worry on the part of the viewer, which can in turn prompt a release of glucocorticoids, or stress hormones. Chronically high levels of glucocorticoids can result in memory impairment, among other issues.

It may also be that television itself isn’t damaging, but that it simply takes away time that could be spent on more neurologically nourishing activities like games, puzzles, or reading. It’s also possible that adults facing cognitive issues are more likely to spend their time with a remote in hand. What’s not debatable is that watching television is largely an idle activity for the brain—something to think about the next time you binge.

[h/t Science News]

No Venom, No Problem: This Spider Uses a Slingshot to Catch Prey

Courtesy of Sarah Han
Courtesy of Sarah Han

There are thousands of ways nature can kill, and spider species often come up with the most creative methods of execution. Hyptiotes cavatus, otherwise known as the triangle weaver spider, is one such example. Lacking venom, the spider manages to weaponize its silk, using it to hurl itself forward like a terrifying slingshot to trap its prey.

This unusual method was studied up close for a recent paper published in the Proceedings of the National Academy of Sciences by researchers at the University of Akron in Ohio. They say it's the only known instance of an animal using an external device—its web—for power amplification.

Hyptiotes cavatus's technique is simple. After constructing a web, the spider takes one of the main strands and breaks it in half, pulling it taut by moving backwards. Then, it anchors itself to a spot with more webbing in the rear. When the spider releases that webbing, it surges forward, propelled by the sudden release of stored energy. In the slingshot analogy, the webbing is the strap and the spider is the projectile.

This jerking motion causes the web to oscillate, tangling the spider's prey further in silk. The spider can repeat this until the web has completely immobilized its prey, a low-risk entrapment that doesn’t require the spider to get too close and risk injury from larger victims.

The triangle weaver spider doesn’t have venom, and it needs to be proactive in attacking and stifling prey. Once a potential meal lands in its web, it’s able to clear distances much more quickly using this slingshot technique than if it crawled over. In the lab, scientists clocked the spider’s acceleration at 2535 feet per second squared.

Spiders are notoriously nimble and devious. Cebrennus rechenbergi, or the flic-flac spider, can do cartwheels to spin out of danger; Myrmarachne resemble ants and even wiggle their front legs like ant antennae. It helps them avoid predators, but if they see a meal, they’ll drop the act and pounce. With H. cavatus, it now appears they’re learning to use tools, too.

[h/t Live Science]

Bad News: The Best Time of the Day to Drink Coffee Isn’t as Soon as You Wake Up

iStock.com/ThomasVogel
iStock.com/ThomasVogel

If you depend on coffee to help get you through the day, you can rest assured that you’re not the world's only caffeine fiend. Far from it. According to a 2018 survey, 64 percent of Americans said they had consumed coffee the previous day—the highest percentage seen since 2012.

While we’re collectively grinding more beans, brewing more pots, and patronizing our local coffee shops with increased frequency, we might not be maximizing the health and energy-boosting benefits of our daily cup of joe. According to Inc., an analysis of 127 scientific studies highlighted the many benefits of drinking coffee, from a longer average life span to a reduced risk for cancer, heart disease, type 2 diabetes, and Parkinson’s disease.

Sounds great, right? The only problem is that the benefits of coffee might be diminished depending on the time of day that you drink it. Essentially, science tells us that it’s best to drink coffee when your body’s cortisol levels are low. That’s because both caffeine and cortisol cause a stress response in your body, and too much stress is bad for your health for obvious reasons. In addition, it might end up making you more tired in the long run.

Cortisol, a stress hormone, is released in accordance with your circadian rhythms. This varies from person to person, but in general, someone who wakes up at 6:30 a.m. would see their cortisol levels peak in different windows, including 8 to 9 a.m., noon to 1 p.m., and 5:30 to 6:30 p.m. Someone who rises at 10 a.m. would experience cortisol spikes roughly three hours later, and ultra-early risers can expect to push this schedule three hours forward.

However, these cortisol levels start to rise as soon as you start moving in the morning, so it isn’t an ideal time to drink coffee. Neither is the afternoon, because doing so could make it more difficult to fall asleep at night. This means that people who wake up at 6:30 a.m. should drink coffee after that first cortisol window closes—roughly between 9:30 a.m. and 11:30 a.m.—if they want to benefit for a little caffeine jolt.

To put it simply: "I would say that mid-morning or early afternoon is probably the best time," certified dietitian-nutritionist Lisa Lisiewski told CNBC. "That's when your cortisol levels are at their lowest and you actually benefit from the stimulant itself."

[h/t Inc.]

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