A Momentary Flow

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302 posts tagged Brain

Is there a period in human development when we have a “teenage brain?”

That’s a great question because there is even the issue that has been raised as to whether adolescence is “for real” in a biological sense. I mean, there’s plenty of cultures where essentially, you know, you’re married off to somebody when you’re 13 or some such thing, and all you are is like an adult with acne, that it’s not a special stage. And the suggestion that this is something that the West kind of invented, dealing with the fact that there’s now viewed as a delay between when one starts one’s main occupation, when one finishes education, and at the earlier end when the hormones start. Ah, we’ll call this magical period in between adolescence. So if it’s just an artificial construct, everything the brain is doing during development should just be in a smooth curve like this, where somewhere arbitrarily oops, that’s what we call adolescence is starting. Made-up concept. But that’s not what you see, because it is distinctive.

Parts of the brain are pretty much going full bore by the time you’re a year old, 5 years old. There’s parts of the brain, the limbic system which is involved centrally in emotion, which are pretty much all there by the time adolescence is starting. Then another distinctive feature of adolescence, which tells you it’s not just this: The hormones start. So what’s the frontal cortex doing there? The easiest picture would be if it’s the one that’s just sluggishly going on. That’s not what you see though. Interestingly, by the beginning of adolescence your frontal cortex is bigger than it’ll be as an adult.

Ingenious: Robert Sapolsky

The primatologist and neurologist talks turbulence—teens, stress, and the information age.

Humans Already Use Way, Way More Than 10 Percent of Their Brains -It’s a complex, constantly multi-tasking network of tissue—but the myth persists.  - By now, perhaps you’ve seen the trailer for the new sci-fi thriller Lucy. It starts with a flurry of stylized special effects and Scarlett Johansson serving up a barrage of bad-guy beatings. Then comes Morgan Freeman, playing a professorial neuroscientist with the obligatory brown blazer, to deliver the film’s familiar premise to a full lecture hall: “It is estimated most human beings only use 10 percent of the brain’s capacity. Imagine if we could access 100 percent. Interesting things begin to happen.” Johansson as Lucy, who has been kidnapped and implanted with mysterious drugs, becomes a test case for those interesting things, which seem to include even more impressive beatings and apparently some kind of Matrix-esque time-warping skills. Of course, the idea that “you only use 10 percent of your brain” is, indeed, 100 hundred percent bogus. Why has this myth persisted for so long, and when is it finally going to die? (via Humans Already Use Way, Way More Than 10 Percent of Their Brains - Sam McDougle - The Atlantic)

Humans Already Use Way, Way More Than 10 Percent of Their Brains
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It’s a complex, constantly multi-tasking network of tissue—but the myth persists.
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By now, perhaps you’ve seen the trailer for the new sci-fi thriller Lucy. It starts with a flurry of stylized special effects and Scarlett Johansson serving up a barrage of bad-guy beatings. Then comes Morgan Freeman, playing a professorial neuroscientist with the obligatory brown blazer, to deliver the film’s familiar premise to a full lecture hall: “It is estimated most human beings only use 10 percent of the brain’s capacity. Imagine if we could access 100 percent. Interesting things begin to happen.” Johansson as Lucy, who has been kidnapped and implanted with mysterious drugs, becomes a test case for those interesting things, which seem to include even more impressive beatings and apparently some kind of Matrix-esque time-warping skills. Of course, the idea that “you only use 10 percent of your brain” is, indeed, 100 hundred percent bogus. Why has this myth persisted for so long, and when is it finally going to die? (via Humans Already Use Way, Way More Than 10 Percent of Their Brains - Sam McDougle - The Atlantic)

Love is the drug, scientists find -Cambridge University scientists find that those with drug addiction and sex addiction have similar neurological responses  - When Roxy Music star Bryan Ferry declared that ”love is the drug” he may have been speaking the truth. Cambridge University scientists have found that sex and drug addiction may be two sides of the same neurological coin. When diagnosed sex addicts looked at explicit sexual images, it triggered brain activity very similar to that seen in people dependent on drugs. But the researchers caution that this does not suggest pornography is generally addictive. Lead scientist Dr Valerie Voon, from Cambridge University, said: ”The patients in our trial were all people who had substantial difficulties controlling their sexual behaviour and this was having significant consequences for them, affecting their lives and relationships. ”In many ways, they show similarities in their behaviour to patients with drug addictions. We wanted to see if these similarities were reflected in brain activity, too. ”There are clear differences in brain activity between patients who have compulsive sexual behaviour and healthy volunteers. These differences mirror those of drug addicts.” Previous studies have suggested that up to one in 25 adults may be affected by an obsession with sexual thoughts, feelings or behaviour they are unable to control. Public awareness of sex addiction has been raised by celebrities seeking help for the problem, including actors Michael Douglas and David Duchovny. The Cambridge scientists recruited 19 male sex addicts and played them short videos featuring either explicit pornographic scenes or people engaged in exciting sports such as skiing or skydiving. At the same time, the men’s brain activity was monitored using a functional magnetic resonance imaging (fMRI) scanner. The experiment was repeated with a matched group of volunteers not affected by sex addiction. Three regions of the brain were found to be especially more active in the brains of the sex addicts than in the healthy volunteers, the ventral striatum, dorsal anterior cingulate and amygdala. All three are also known to be activated in drug addicts stimulated by the sight of drug-taking paraphernalia. (via Love is the drug, scientists find - Telegraph)

Love is the drug, scientists find
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Cambridge University scientists find that those with drug addiction and sex addiction have similar neurological responses
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When Roxy Music star Bryan Ferry declared that ”love is the drug” he may have been speaking the truth. Cambridge University scientists have found that sex and drug addiction may be two sides of the same neurological coin. When diagnosed sex addicts looked at explicit sexual images, it triggered brain activity very similar to that seen in people dependent on drugs. But the researchers caution that this does not suggest pornography is generally addictive. Lead scientist Dr Valerie Voon, from Cambridge University, said: ”The patients in our trial were all people who had substantial difficulties controlling their sexual behaviour and this was having significant consequences for them, affecting their lives and relationships. ”In many ways, they show similarities in their behaviour to patients with drug addictions. We wanted to see if these similarities were reflected in brain activity, too. ”There are clear differences in brain activity between patients who have compulsive sexual behaviour and healthy volunteers. These differences mirror those of drug addicts.” Previous studies have suggested that up to one in 25 adults may be affected by an obsession with sexual thoughts, feelings or behaviour they are unable to control. Public awareness of sex addiction has been raised by celebrities seeking help for the problem, including actors Michael Douglas and David Duchovny. The Cambridge scientists recruited 19 male sex addicts and played them short videos featuring either explicit pornographic scenes or people engaged in exciting sports such as skiing or skydiving. At the same time, the men’s brain activity was monitored using a functional magnetic resonance imaging (fMRI) scanner. The experiment was repeated with a matched group of volunteers not affected by sex addiction. Three regions of the brain were found to be especially more active in the brains of the sex addicts than in the healthy volunteers, the ventral striatum, dorsal anterior cingulate and amygdala. All three are also known to be activated in drug addicts stimulated by the sight of drug-taking paraphernalia. (via Love is the drug, scientists find - Telegraph)