Friday, August 7, 2009

Can your brain fight fatigue?


New York Times
Greetings, Yes-Brainers.

The essay "Can Your Brain Fight Fatigue?" by Gretchen Reynolds, which appeared in the New York Times on July 15, 2009, explains why some researchers now believe "that exhaustion isn’t just in the muscles but also involves the brain. 'What we now think is that the muscle isn’t acting on its own,' [researcher Ross Tucker] says. 'There’s an interplay of central processing and muscular exertion'.”


KEY CONCEPTS:

"Recently, researchers in England discovered that simply rinsing your mouth with a sports drink may fight fatigue."

"By the end of the time trials, the cyclists who had rinsed with the carbohydrate drinks — and spit them out — finished significantly faster than the water group. Their heart rates and power output were also higher. But when rating the difficulty of the ride, on a numerical scale, their feelings about the effort involved matched those for the water group."

"In a separate portion of the experiment, the scientists, using a functional M.R.I., found that areas within the brain that are associated with reward, motivation and emotion were activated when subjects swished a carbohydrate drink."

"The role of the brain in determining how far and hard we can exercise — its role, in other words, in fatigue — is contentious. Until recently, most researchers would have said that the brain played little role in determining how hard we can exercise."

"Instead, [Ross Tucker, a researcher with the Sports Science Institute of South Africa] and many (but not all) physiologists now believe that exhaustion isn’t just in the muscles but also involves the brain. “What we now think is that the muscle isn’t acting on its own,” he says. “There’s an interplay of central processing and muscular exertion.”

"In other words, the mind, recognizing that the body may be going too hard, starts sending fewer of the messages that tell the muscles to contract. The muscles contract less frequently and more feebly. In a sensation familiar to anyone who exercises, your legs die beneath you."

"I think the training effect of this theory is potentially very profound,” Tucker says. “Training is no longer simply an act of getting the muscles used to lactate or teaching the lungs how to breathe harder.” It’s also about getting your brain to accept new limits by pushing yourself, safely. “Once your brain recognizes that you’re not going to damage yourself,” Foster says, “it’ll be happy to let you go.”


To read the entire essay and thereby judge the value of the reported experiments used to support the essay's key ideas, click on this link.


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Tuesday, August 4, 2009

Book review: "You Are Here"



THE BOOK You Are Here: Why we Can Find Our Way to the Moo and Get lost in the Mall by Colin Ellard. Illustrated. 328 pp. Doubleday. $25.


TITLE OF REVIEW "Where Am I?" — "People have become disconnected from their settings, requiring a GPS to get anywhere."


REVIEWER Jonah Lehrer, author of How We Decide and a contributing editor at Wired.


SOURCEThe New York Times, Book Reviews, 12 July 2009.


LINK TO REVIEW You Are Here


KEY CONCEPTS OF THE REVIEW:

"Colin Ellard, a behavorial neuroscientist at the University of Waterloo, Ontario, probes . . . [the] shortcomings of human spatial intelligence in his delightfully lucid book 'You are Here'."

"We’ve become hopelessly disconnected from out setting, burdened with a brain that needs a GPS satellite just to get across town.


"Ellard argues that the human talent for abstraction — we can easily imagine places and spaces that don’t exist — comes with a hidden cost, which is that our mental maps of the physical world have become sparser over the course of human evolution."


"Unlike insects, we can’t keep track of the patterns of polarized light; unlike loggerhead turtles, we don’t pay attention to magnetic fields; unlike geese, we’re not very good at path integration, which is why we have to write down directions that involve multiple turns."


"And yet, just when I started to get really jealous of desert ants, Ellard points out that it’s possible to improve our feeble spatial brain."


"The second half of “You Are Here” bears only a tangential relation to the first, shifting focus from feats of navigation to the design of public spaces."


"Why, for example, do we gravitate to certain places inside the house? The answer, it turns out, has a lot to with what architects call isovists, the region of visibility from particular vantage points."


"Because our spatial instincts follow a few simple rules, scientists who use “space syntax analyses” are able to envision how a place will be used before it exists.

To read the entire review, click You Are Here.



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Sunday, August 2, 2009

Habits of Happiness


Matthieu Ricard

Below is a copy of an e-mail from Cindy to Yes-brainers in which she introduces and provides a link to the video "Habits of Happiness" with Matthieu Richard.


From: Cindy

Subject: [Yes-Brainers] Habits of Happiness

Date: August 2, 2009 10:46:11 AM PDT

To: John


French monk and former scientist at the Pasteur Institute, Matthieu Ricard, describes the power of actively cultivating happiness thru meditation.

Includes scientific documentation of success via fMRI.

http://www.americanbuddhist.net/matthieu-ricard-habits-happiness

--

Posted By cindy to Yes-Brainers at 8/02/2009 10:34:00 AM

Thanks, Cindy!

John

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Saturday, August 1, 2009

Language may shape our thoughts


Viaduct de Millau


How language can shape thought

Sharon Begley, Science editor at Newsweek Magazine, reports in her essay “Language may shape thoughts” that Lera Boroditsky, a psychologist at Stanford University, is amassing evidence that confirms the often challenged Sapir-Whorf hypothesis of linguistic relativity first propunded by Edward Sapir and Benjamin Lee Whorf of the University of Chicago in 1954, namely that the structure of a culture’s language shapes what people think and do.

Begley quotes Borodisky:

"The effect [of the experiments] is powerful enough, she says, that "the private mental lives of speakers of different languages may differ dramatically," not only when they are thinking in order to speak, "but in all manner of cognitive tasks," including basic sensory perception. "Even a small fluke of grammar"—the gender of nouns—"can have an effect on how people think about things in the world," she says.

Elements of language that Boroditsky claims can influence thought include

grammatical gender,

names for colors,

use of compass directions, and

words that describe causality.

Following is the full text of Begley’s essay, which appeared in Newsweek, July 20, 2009, page 31.

Language may shape our thoughts


Sharon Begley

When the Viaduct de Millau opened in the south of France in 2004, this tallest bridge in the world won worldwide accolades. German newspapers described how it "floated above the clouds" with "elegance and lightness" and "breathtaking" beauty. In France, papers praised the "immense" "concrete giant." Was it mere coincidence that the Germans saw beauty where the French saw heft and power? Lera Boroditsky thinks not.


A psychologist at Stanford University, she has long been intrigued by an age-old question whose modern form dates to 1956, when linguist Benjamin Lee Whorf asked whether the language we speak shapes the way we think and see the world. If so, then language is not merely a means of expressing thought, but a constraint on it, too. Although philosophers, anthropologists, and others have weighed in, with most concluding that language does not shape thought in any significant way, the field has been notable for a distressing lack of empiricism—as in testable hypotheses and actual data.


That's where Boroditsky comes in. In a series of clever experiments guided by pointed questions, she is amassing evidence that, yes, language shapes thought. The effect is powerful enough, she says, that "the private mental lives of speakers of different languages may differ dramatically," not only when they are thinking in order to speak, "but in all manner of cognitive tasks," including basic sensory perception. "Even a small fluke of grammar"—the gender of nouns—"can have an effect on how people think about things in the world," she says.

As in that bridge. In German, the noun for bridge, Brücke, is feminine. In French, pont is masculine. German speakers saw prototypically female features; French speakers, masculine ones. Similarly, Germans describe keys (Schlüssel) with words such as hard, heavy, jagged, and metal, while to Spaniards keys (llaves) are golden, intricate, little, and lovely. Guess which language construes key as masculine and which as feminine? Grammatical gender also shapes how we construe abstractions. In 85 percent of artistic depictions of death and victory, for instance, the idea is represented by a man if the noun is masculine and a woman if it is feminine, says Boroditsky. Germans tend to paint death as male, and Russians tend to paint it as female.

Language even shapes what we see. People have a better memory for colors if different shades have distinct names—not English's light blue and dark blue, for instance, but Russian's goluboy and sinly. Skeptics of the language-shapes-thought claim have argued that that's a trivial finding, showing only that people remember what they saw in both a visual form and a verbal one, but not proving that they actually see the hues differently. In an ingenious experiment, however, Boroditsky and colleagues showed volunteers three color swatches and asked them which of the bottom two was the same as the top one. Native Russian speakers were faster than English speakers when the colors had distinct names, suggesting that having a name for something allows you to perceive it more sharply. Similarly, Korean uses one word for "in" when one object is in another snugly (a letter in an envelope), and a different one when an object is in something loosely (an apple in a bowl). Sure enough, Korean adults are better than English speakers at distinguishing tight fit from loose fit.

In Australia, the Aboriginal Kuuk Thaayorre use compass directions for every spatial cue rather than right or left, leading to locutions such as "there is an ant on your southeast leg." The Kuuk Thaayorre are also much more skillful than English speakers at dead reckoning, even in unfamiliar surroundings or strange buildings. Their language "equips them to perform navigational feats once thought beyond human capabilities," Boroditsky wrote on Edge.org.

Science has only scratched the surface of how language affects thought. In Russian, verb forms indicate whether the action was completed or not—as in "she ate [and finished] the pizza." In Turkish, verbs indicate whether the action was observed or merely rumored. Boroditsky would love to run an experiment testing whether native Russian speakers are better than others at noticing if an action is completed, and if Turks have a heightened sensitivity to fact versus hearsay. Similarly, while English says "she broke the bowl" even if it smashed accidentally (she dropped something on it, say), Spanish and Japanese describe the same event more like "the bowl broke itself." "When we show people video of the same event," says Boroditsky, "English speakers remember who was to blame even in an accident, but Spanish and Japanese speakers remember it less well than they do intentional actions. It raises questions about whether language affects even something as basic as how we construct our ideas of causality."

*Griffin, Em. "Verbal Messages." A First Look at Communication Theory. New York: McGraw-Hill, 1997. 46.


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Thursday, July 30, 2009

Vital Stats and Facts About Your Brain


mutuallyoccluded.com


AMAZING BRAIN / Vital Stats & Facts About Your Brain

From Stroke Smart Magazine, January/February 20

3 —— The approximate number of pounds that your brain weighs.

10 —— The approximate number of pounds that an elephant's brain weighs.

2 —— The approximate number of ounces that a dog's brain weighs.



1 — The approximate number of pounds your brain weighed when you were born. In fact, your brain was closer to its full adult size than any other organ in your body!



18 —— The age at which your brain stops growing. N.B. See Cindy's addendum below.



1/5 —— The portion of your body's blood supply your brain uses.

100 billion —— Number of brain cells you have.

6.8 billion —— Number of people living in the world.

268 —— The speed in miles per hour that information can be transmitted in and to your brain.


1.9 million —— Brain cells killed every minute during an ischemic clot-caused stroke.

12 —— The amount of treatment delay in minutes that it takes for a pea-sized piece of the brain to die.

10 —— Average time in hours of a full-blown stroke.


www.stroke.org



ADDENDUM FROM CINDY:

At least one point is outdated:
We have known for sometime that the brain continues to grow, especially in the frontal lobes, until age 25 years! This is thought to account for teenage/young adult impulsive and risk taking behaviour and egocentricity in being less able to have the "insight' to consider another's point of view.

Am sending a great neuroplasticity video to yes-brainers shortly.


Thanks, Cindy! Looking forward to the video. — John


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Wednesday, July 29, 2009

Article: Why Music Moves Us


Greetings, Yes-brainers.


This posting provides a link to an article from the July 2009 issue of Scientific American Mind titled


Why Music Moves Us


New research explains music's power

over human emotions and its benefits

to our mental and physical well-being.


By Karen Schrok


KEY CONCEPTS


"Some scientists conclude that music’s influence over us may be a chance event, arising from its ability to hijack brain systems built for other purposes such as language, emotion and movement."


"Music seems to offer a novel method of communication rooted in emotions rather than in meaning. Research shows that what we feel when we hear a piece of music is remarkably similar to what everybody else in the room is experiencing."


"Songs facilitate emotional bonding and even physical interactions such as marching or dancing together and thus may help cement ties that underlie the formation of human societies. In addition, tunes may work to our benefit on an individual level, manipulating mood and even human physiology more effectively than words can."


Read Why Music Moves Us.



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