Archive for November 2009
Woman uses brain implant to stimulate her brain’s pleasure center, study 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…
Internet use does not increase social isolation, study finds
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 cognitive benefits of a bad mood
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.
Is dopamine the neural basis for motivation?
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?”
