TIME Magazine reports:

For nearly two centuries, researchers have suspected that sleep plays an important role in learning and memory. But it’s only in the last decade that neuroscientists have discovered the most convincing evidence that memory is indeed dependent on sleep. The prevailing theory is that during deep sleep, the brain replays certain experiences from the day, which, in turn, strengthens the memory of what happened. It is thought that when it comes to factual memories, like names, faces, numbers or locations, memory consolidation happens only during deep sleep — a phase of non–rapid eye movement sleep. (The other broad type of sleep, called rapid eye movement or REM sleep, which is when dreaming occurs, is believed to play a role in consolidating memories involving emotions and motor skills, such as dancing or playing an instrument.)

io9.com reports:

The 1986 case of a woman addicted to stimulating herself with a brain implant is chronicled in a scientific article from Pain journal called Compulsive thalamic self-stimulation: a case with metabolic, electrophysiologic and behavioral correlates.

The unnamed woman had been suffering from chronic pain… and had tried a number of drugs to deal with it. Though she was an alcoholic, doctors prescribed opium-based painkillers to her and she had been known to take more than her recommended dose. With her history of drug addiction, it’s easy to see why doctors would have imagined that a brain implant would be the best course of action for the treatment of her chronic pain. Little did they know that the woman would become addicted to that, too…

The Pew Internet & American Life Project has released a new report, available here, that examines the relationship between Internet use and social isolation. The reports abstract is as follows:

This report adds new insights to an ongoing debate about the extent of social isolation in America. A widely-reported 2006 study argued that since 1985 Americans have become more socially isolated, the size of their discussion networks has declined, and the diversity of those people with whom they discuss important matters has decreased. In particular, the study found that Americans have fewer close ties to those from their neighborhoods and from voluntary associations. Sociologists Miller McPherson, Lynn Smith-Lovin and Matthew Brashears suggest that new technologies, such as the internet and mobile phone, may play a role in advancing this trend. Specifically, they argue that the type of social ties supported by these technologies are relatively weak and geographically dispersed, not the strong, often locally-based ties that tend to be a part of peoples’ core discussion network. They depicted the rise of internet and mobile phones as one of the major trends that pulls people away from traditional social settings, neighborhoods, voluntary associations, and public spaces that have been associated with large and diverse core networks…

This Pew Internet Personal Networks and Community survey finds that Americans are not as isolated as has been previously reported. People’s use of the mobile phone and the internet is associated with larger and more diverse discussion networks. And, when we examine people’s full personal network – their strong and weak ties – internet use in general and use of social networking services such as Facebook in particular are associated with more diverse social networks.

The BBC reports:

An Australian psychology expert who has been studying emotions has found being grumpy makes us think more clearly. In contrast to those annoying happy types, miserable people are better at decision-making and less gullible, his experiments showed. While cheerfulness fosters creativity, gloominess breeds attentiveness and careful thinking, Professor Joe Forgas told Australian Science Magazine.

The NY Times reports:

People talk of getting their “dopamine rush” from chocolate, music, the stock market, the BlackBerry buzz on the thigh — anything that imparts a small, pleasurable thrill. Familiar agents of vice like cocaine, methamphetamine, alcohol and nicotine are known to stimulate the brain’s dopamine circuits, as do increasingly popular stimulants like Adderall and Ritalin.

In the communal imagination, dopamine is about rewards, and feeling good, and wanting to feel good again, and if you don’t watch out, you’ll be hooked, a slave to the pleasure lines cruising through your brain. Hey, why do you think they call it dopamine?

Yet as new research on dopamine-deficient mice and other studies reveal, the image of dopamine as our little Bacchus in the brain is misleading…

In the emerging view, discussed in part at the Society for Neuroscience meeting last week in Chicago, dopamine is less about pleasure and reward than about drive and motivation, about figuring out what you have to do to survive and then doing it. “When you can’t breathe, and you’re gasping for air, would you call that pleasurable?” said Nora D. Volkow, a dopamine researcher and director of the National Institute on Drug Abuse. “Or when you’re so hungry that you eat something disgusting, is that pleasurable?”

Wired reports on the new field of optogentics. This research takes light-sensitive plant cells and implants them in animals, allowing light to activate specific neurons in a way not previously possible.

Science Daily reports:

UCLA scientists… found that middle-aged and older adults with little Internet experience were able to trigger key centers in the brain that control decision-making and complex reasoning after just one week of surfing the Web.

The findings, presented Oct. 19 at the 2009 meeting of the Society for Neuroscience, suggest that Internet training can stimulate neural activation patterns and could potentially enhance brain function and cognition in older adults.

New Scientist reports:

“Power holders feel they need to be superior and competent. When they don’t feel they can show that legitimately, they’ll show it by taking people down a notch or two,” says Nathanael Fast, a social psychologist at the University of Southern California in Los Angeles, who led a series of experiments to explore this effect.

In one, Fast and his colleague Serena Chen, who is at the University of California, Berkeley, asked 90 men and women who had jobs to complete online questionnaires about their aggressive tendencies and perceived competence. The most aggressive of the lot tended to have both high-power jobs and a chip on their shoulder, Fast and Chen found.

NEWSWEEK reports:

We all want our children to be unintimidated by differences and have the social skills necessary for a diverse world. The question is, do we make it worse, or do we make it better, by calling attention to race?

CNN reports:

A new study suggests that people who often do multiple tasks in a variety of media — texting, instant messaging, online video watching, word processing, Web surfing, and more — do worse on tests in which they need to switch attention from one task to another than people who rarely multitask in this way.

Specifically, heavy multitaskers are more easily distracted by irrelevant information than those who aren’t constantly in a multimedia frenzy, according to the study in the Proceedings of the National Academy of Sciences.

One reason may be because the multitaskers tend to retain the distracting information in their short-term memory, which affects their ability to focus, compared with people who don’t check their e-mail while talking on the phone and sneaking in some online shopping.

The article is available here (subscription required).