Tag Archives: Overlook

Simple Strategies to Combat Brain Decline: Discover What Most People Overlook

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Have you ever recalled the feelings of your first day at school when you caught a whiff of clay? Or perhaps a perfume from a passing stranger instantly transported you to thoughts of a long-lost love?

This experience highlights the powerful connection between smell and memory.

Neuroscientists have confirmed for over a century that our olfactory system is closely linked to brain regions managing memory and emotions, like the hippocampus and amygdala.

When we inhale, odor receptors in our noses connect with odor molecules, such as those from clay. This triggers olfactory neurons to send rapid electrical signals to varied brain areas in mere milliseconds.

“These are very direct connections between the olfactory system and areas of the brain associated with memory and emotion,” says Professor Thomas Hummel, who has explored the olfactory system at the Dresden University of Technology for decades.

The deep link between smell and memory suggests that losing the sense of smell might be an early indicator of cognitive decline. This is associated not only with normal aging but with neurodegenerative diseases, such as Alzheimer’s disease.

Image credit: Joe Waldron

But what if the reverse is true? Strengthening your olfactory system could not only heighten your ability to enjoy fragrances but also enhance your memory and overall cognition?

This idea has gained traction in laboratories recently, piquing the interest of researchers who believe there’s merit to it.

Several studies, albeit small-scale, have shown that olfactory training can significantly impact cognitive abilities and even alter the brain’s physical structure.

A 2023 review of 18 studies concluded that olfactory training can improve cognitive functions like verbal fluency and language learning.

It has also been shown to increase the volume of specific brain areas, including the hippocampus and olfactory bulb, as well as enhance inter-region connectivity.

Notably, these cognitive enhancements are not limited to individuals experiencing cognitive decline; olfactory training can benefit the general population as well.

“It’s not a magic solution,” Hummel notes. “Enhancing your ability to smell doesn’t automatically make you smarter, but it can aid certain cognitive functions.”

“This concept is appealing because it represents a change that can occur through a simple activity,” he adds. “Anyone can do it, and there are no side effects.”

Enhanced olfactory function may also improve cognitive functions – Image courtesy of Joe Waldron

Various mechanisms have been proposed to explain this effect. One aspect suggests that increased sensory input generally promotes better brain health.

It could also relate to our evolutionary background, wherein our ancestors navigated largely by their sense of smell. Additionally, since the olfactory system has direct access to the hippocampus, it might directly stimulate brain circuits associated with learning and memory.

Amid this exploration, many startups are identifying potential opportunities and are developing scent-training products.

One such startup, Osmo, features an AI-powered digital scent engine, securing $70 million in a recent funding round. Meanwhile, researchers at UCL are advancing the my scent digital olfactory training platform.

You can start training your nose at home with a simple odor training protocol—select about four distinct and familiar odors.

“Stronger scents are more effective than weaker ones,” Hummel advises. Common scents used for research include clove, lemon, coffee, and eucalyptus.

Dedicate five minutes twice daily, focusing intently on each scent for at least 20 seconds. Consider what each scent evokes: How should it smell? What notes can you identify? Is it more intense or milder than expected?

“Consistency is key; change scents every two months for optimal results,” Hummel suggests. While he emphasizes the need for larger studies, he reassures, “This practice certainly won’t cause any harm.”

A wise old wizard once said: “When in doubt, always follow your nose.”

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Source: www.sciencefocus.com

Why Space Weather Could Have Caused SETI to Overlook Alien Signals

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Solar flare captured by NASA's Solar Dynamics Observatory on October 2, 2014, showcasing solar material ejecting into space.

Is there anyone there?

NASA/SDO

Recent studies suggest that solar winds may have obstructed our ability to receive signals from intelligent extraterrestrial civilizations. Researchers from the Search for Extraterrestrial Intelligence (SETI) Institute indicate that we might be searching for the wrong types of signals, leading to the potential oversight of crucial evidence of alien life. However, the silver lining is that future discoveries are becoming increasingly likely.

This nonprofit organization focuses on research aimed at validating the existence of extraterrestrial life, including monitoring unexplained extraterrestrial radio signals that don’t align with known natural cosmic phenomena.

Traditionally, signals from distant planets were anticipated to be sharp and clear radio transmissions within a narrow frequency range. New research, however, posits that these transmissions could become distorted, appearing less distinct due to interference from a star’s plasma winds.

SETI Institute researchers Vishal Gajjar and Grace Brown evaluated the effects of solar interference on radio signals emitted by spacecraft in our solar system and extrapolated their findings to other stellar environments. They found that a 100 megahertz signal could be diffused to a dramatically reduced threshold of 100 hertz, falling below conventional detection limits. Solar phenomena can exacerbate signal spread significantly.

According to Simon George at the SETI Institute, there is a growing consensus that the search for narrow bandwidth radio signals is becoming an obsolete strategy in the quest to detect life at vast distances. “The evolution of communication technology since the 1960s suggests that a sophisticated civilization would likely utilize broader spectrum technologies to transmit more information,” he explains.

“Viewing Earth as an exoplanet from an alien perspective has become a common analogy within SETI,” says George. “In the 1960s, Earth was a prominent narrowband source, but as our transmission techniques have shifted, it has become less prominent. This would change if an advanced civilization were intentionally broadcasting clear signals meant to convey ‘We are here,’ or other specific messages.”

Professor John Elliott from the University of St Andrews in the UK maintains an optimistic outlook regarding this revelation. While it’s possible that evidence may have been overlooked in previous searches, he believes that future endeavors are likely to yield better results.

“We have been engaged in this research for over 50 years, which is significant time in scientific terms,” Elliott states. He emphasizes that signal distortion hasn’t been the only obstacle in past investigations; outdated techniques for isolating signals from noise have also posed challenges. However, advancements in computing power and AI are paving the way for improved methodologies. “Until recently, we lacked the necessary equipment and computational capabilities to make substantial breakthroughs. We were metaphorically navigating in the dark,” he adds. “Looking ahead another millennium, it’s exciting to imagine the advancements in technology that await us.”

Eric Atwell from the University of Leeds, who contributed to SETI projects at the turn of the millennium, has quantified how this discovery raises the likelihood of detecting a possible alien signal from 0.0001% to 0.0002%.

“While these probabilities remain extremely low, we have not considered our efforts wasted,” he reflects. The SETI team continues to explore and experiment, gathering substantial evidence that existing strategies are not as fruitful as hoped.

“The objective is to detect unusual signals that can’t be explained by existing astronomical phenomena, though this methodology can be somewhat erratic when it comes to uncovering intelligent life,” Atwell comments.

He expresses skepticism regarding the notion of passively waiting for clear signals from extraterrestrial life. “If intelligent beings exist and wish to be discovered, they would likely send more distinct communications,” he asserts.

Alternative organizations, such as the Messaging Extraterrestrial Intelligence Institute (METI), are employing different methodologies to find alien life by actively broadcasting signals to other planets, enhancing the chance that extraterrestrial civilizations may recognize and respond to such communications.

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Source: www.newscientist.com

Standard IVF Tests Overlook Certain Genetic Abnormalities in Embryos

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Colored light micrograph of a human embryo following in vitro fertilization

Zephyr/Science Photo Library

During in vitro fertilization (IVF), embryos are subjected to genetic screening prior to being placed in the uterus. Recent studies, however, have shown that the common tests may fail to identify genetic abnormalities arising shortly before implantation. The implications for choosing embryos that are likely to lead to a healthy pregnancy remain uncertain.

This process, known as preimplantation genetic testing for aneuploidy (PGT-A), is conducted about 5 to 6 days after fertilization. It involves extracting cells from the embryo’s outer layer to assess for chromosomal irregularities, which can elevate the risk of miscarriage. However, this testing only captures a moment in time, as cellular division continues and may introduce genetic changes prior to implantation.

To address this gap, Ahmed Abdelbaki and his colleagues at the University of Cambridge monitored the progress of human embryos 46 hours post-thawing, replicating the timeline from evaluation to implantation. Typically, the embryo takes 1 to 5 days to implant after being transferred to the uterus. Given that embryos are highly sensitive to the light from traditional microscopes, prior studies only managed to observe them for about 24 hours. The research team employed light-sheet microscopy, a technique that illuminates only a thin slice of the embryo at once, minimizing light exposure and enabling longer observation durations.

In their experiment, the researchers injected 13 human embryos with a fluorescent dye that attaches to DNA, facilitating real-time tracking of genetic abnormality formation. They recorded the division of 223 cells and discovered that 8% exhibited chromosomal misalignment. This misalignment occurs when chromosomes improperly arrange themselves before cell division, significantly raising the likelihood of creating cells with abnormal chromosome counts, potentially hindering implantation, increasing miscarriage risk, and leading to conditions such as Down syndrome.

This indicates that genetic changes might arise later. “These variances appear in the embryo subsequent to PGT-A screening,” stated Lily Zimmerman from Northwell Health in New York.

These chromosomal errors were restricted to the outer cell layer responsible for forming the placenta, rather than the central cells that mature into the fetus. Previous findings suggest that successful pregnancies can occur even with certain genetic abnormalities in the outer cells. Thus, Abdelbaki posits that these genetic errors may not detrimentally impact the embryo’s survival chances.

“In my view, this study highlights the necessity for further research in embryo screening. It’s not simply a matter of categorizing embryos as genetically normal or abnormal,” commented Professor Zimmerman. She also noted that it remains unclear how genetic alterations occurring between screening and implantation might influence embryo viability, and given that the study examined only a small sample of embryos, the broader applicability of these findings is uncertain.

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Source: www.newscientist.com