Self-Motivation
David Goggins
Former Navy Seal
Career Development
Bryan Cranston
Actor
Critical Thinking
Liv Boeree
International Poker Champion
Emotional Intelligence
Amaryllis Fox
Former CIA Clandestine Operative
Management
Chris Hadfield
Retired Canadian Astronaut & Author
Learn
from the world's big
thinkers
Start Learning

Bloody March in Honduras

This past month, Honduras has witnessed an unprecedented series of attacks on journalists: five journalists were killed in March alone, making the country, along with Mexico, one of the two deadliest countries in the Western Hemisphere for reporters this year.

On the first day of the month, gunmen opened fire on TV journalists Joseph Ochoa and Karol Cabrera, killing Ochoa and seriously wounding Cabrera. Cabrera is a prominent journalist and commentator, and her outspoken support for last summer's military-led coup has made her family the target of violent attacks in the past: her teenage daughter, who was eight months pregnant, was murdered in December of last year.


On March 11, gunmen in a van pulled up to the car of radio journalist David Meza Montesinos and opened fire, killing Montesinos.

TV journalist Nahúm Palacios Arteaga was killed on March 14. According to Reporters Without Borders, "Palacios and one of his colleagues had received threatening phone calls in which they were told to stop 'defending the poor.'" Following this summer's coup, his home and office were raided and his equipment was confiscated.

On March 26, Friday of last week, the car in which radio journalists Bayardo Mairena and Manuel Juárez were traveling was sprayed with bullets by gunmen, who then shot them at close range. Their deaths brought the number of reporters assassinated in March to five.

As the Los Angeles Times reports, there doesn't seem to be any clear political motivation for the attacks: some of the victims supported the military coup and interim-president Roberto Micheletti, some had been critical of the coup, others had no strong political leanings. US news outlets have largely ignored the story, leaving the task of getting the word out about the attacks to international journalist rights organizations. The murder of five journalists in a month is a big story, no matter how you look at it, but the media's lack of coverage is all the more surprising for the fact that the assault of Cabrera that resulted in Ochoa's death was caught on tape. As she was driving with Ochoa, Cabrera speaking on air on a radio show, so that the attack was broadcast live, gunshots, screaming, and all. But beyond this gruesome evidence, the slew of attacks have created an environment in which journalists are afraid to do their jobs, and the American media should be reporting this assault on the freedom of information.

Image courtesy Wikimedia Commons, user LeRoc.

Neom, Saudi Arabia's $500 billion megacity, reaches its next phase

Construction of the $500 billion dollar tech city-state of the future is moving ahead.

Credit: Neom
Technology & Innovation
  • The futuristic megacity Neom is being built in Saudi Arabia.
  • The city will be fully automated, leading in health, education and quality of life.
  • It will feature an artificial moon, cloud seeding, robotic gladiators and flying taxis.
Keep reading Show less

Tuberculosis vaccine shows promise in reducing COVID deaths

A new study suggests that a century-old vaccine may reduce the severity of coronavirus cases.

Closeup of a BCG vaccination.

Credit: Kekyalyaynen.
Surprising Science
  • A new study finds a country's tuberculosis BCG vaccination is linked to its COVID-19 mortality rate.
  • More BCG vaccinations is connected to fewer severe coronavirus cases.
  • The study is preliminary and more research is needed to support the findings.
Keep reading Show less

Human brains remember certain words more easily than others

A study of the manner in which memory works turns up a surprising thing.

Image Point Fr / Shutterstock
Mind & Brain
  • Researchers have found that some basic words appear to be more memorable than others.
  • Some faces are also easier to commit to memory.
  • Scientists suggest that these words serve as semantic bridges when the brain is searching for a memory.

Cognitive psychologist Weizhen Xie (Zane) of the NIH's National Institute of Neurological Disorders and Stroke (NINDS) works with people who have intractable epilepsy, a form of the disorder that can't be controlled with medications. During research into the brain activity of patients, he and his colleagues discovered something odd about human memory: It appears that certain basic words are consistently more memorable than other basic words.

The research is published in Nature Human Behaviour.

An odd find

Image source: Tsekhmister/Shutterstock

Xie's team was re-analyzing memory tests of 30 epilepsy patients undertaken by Kareem Zaghloul of NINDS.

"Our goal is to find and eliminate the source of these harmful and debilitating seizures," Zaghloul said. "The monitoring period also provides a rare opportunity to record the neural activity that controls other parts of our lives. With the help of these patient volunteers we have been able to uncover some of the blueprints behind our memories."

Specifically, the participants were shown word pairs, such as "hand" and "apple." To better understand how the brain might remember such pairings, after a brief interval, participants were supplied one of the two words and asked to recall the other. Of the 300 words used in the tests, five of them proved to be five times more likely to be recalled: pig, tank, doll, pond, and door.

The scientists were perplexed that these words were so much more memorable than words like "cat," "street," "stair," "couch," and "cloud."

Intrigued, the researchers looked at a second data source from a word test taken by 2,623 healthy individuals via Amazon's Mechanical Turk and found essentially the same thing.

"We saw that some things — in this case, words — may be inherently easier for our brains to recall than others," Zaghloul said. That the Mechanical Turk results were so similar may "provide the strongest evidence to date that what we discovered about how the brain controls memory in this set of patients may also be true for people outside of the study."

Why understanding memory matters

person holding missing piece from human head puzzle

Image source: Orawan Pattarawimonchai/Shutterstock

"Our memories play a fundamental role in who we are and how our brains work," Xie said. "However, one of the biggest challenges of studying memory is that people often remember the same things in different ways, making it difficult for researchers to compare people's performances on memory tests." He added that the search for some kind of unified theory of memory has been going on for over a century.

If a comprehensive understanding of the way memory works can be developed, the researchers say that "we can predict what people should remember in advance and understand how our brains do this, then we might be able to develop better ways to evaluate someone's overall brain health."

Party chat

Image source: joob_in/Shutterstock

Xie's interest in this was piqued during a conversation with Wilma Bainbridge of University of Chicago at a Christmas party a couple of years ago. Bainbridge was, at the time, wrapping up a study of 1,000 volunteers that suggested certain faces are universally more memorable than others.

Bainbridge recalls, "Our exciting finding is that there are some images of people or places that are inherently memorable for all people, even though we have each seen different things in our lives. And if image memorability is so powerful, this means we can know in advance what people are likely to remember or forget."

spinning 3D model of a brain

Temporal lobes

Image source: Anatomography/Wikimedia

At first, the scientists suspected that the memorable words and faces were simply recalled more frequently and were thus easier to recall. They envisioned them as being akin to "highly trafficked spots connected to smaller spots representing the less memorable words." They developed a modeling program based on word frequencies found in books, new articles, and Wikipedia pages. Unfortunately, the model was unable to predict or duplicate the results they saw in their clinical experiments.

Eventually, the researchers came to suspect that the memorability of certain words was linked to the frequency with which the brain used them as semantic links between other memories, making them often-visited hubs in individuals's memory networks, and therefore places the brain jumped to early and often when retrieving memories. This idea was supported by observed activity in participants' anterior temporal lobe, a language center.

In epilepsy patients, these words were so frequently recalled that subjects often shouted them out even when they were incorrect responses to word-pair inquiries.

Seek, find

Modern search engines no longer simply look for raw words when resolving an inquiry: They also look for semantic — contextual and meaning — connections so that the results they present may better anticipate what it is you're looking for. Xie suggests something similar may be happening in the brain: "You know when you type words into a search engine, and it shows you a list of highly relevant guesses? It feels like the search engine is reading your mind. Well, our results suggest that the brains of the subjects in this study did something similar when they tried to recall a paired word, and we think that this may happen when we remember many of our past experiences."

He also notes that it may one day be possible to leverage individuals' apparently wired-in knowledge of their language as a fixed point against which to assess the health of their memory and brain.

Videos

Does conscious AI deserve rights?

If machines develop consciousness, or if we manage to give it to them, the human-robot dynamic will forever be different.

Scroll down to load more…
Quantcast