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...might this relate to humans? Actually, mild stress has been shown to improve learning in people; too much does the opposite. Smith wonders whether the discovery may help explain certain learning declines, like the drop-off in the ability to learn to speak a foreign language without an accent, which occurs sometime around puberty...
...interview, McGivern said he thought an apparent drop-off in the ability to learn new things at puberty might merely reflect the fact that teenagers are becoming more attuned to social issues than dull learning tasks: "It may be a shift in what we pay attention to and are motivated to look at that's driving this." But that would not explain Smith's mice or similar biochemical changes she has observed in tissue samples related to learning. (There's no question of motivation in a petri dish...
GABA is not the only neurotransmitter system that goes out of whack at puberty, Giedd notes. Recent studies at Harvard suggest that dopamine receptors also temporarily proliferate, a change that might be related to the impulsiveness and risk-taking behaviors seen in teens. These bursts of brain changes seem to be connected to developmentally sensitive periods, says Giedd. Understanding them better just might unlock some of the enduring puzzles of adolescent behavior...
...might not think you would need to be armed to order a latte, but the Bay Area gun owners--who are loosely affiliated with a website called OpenCarry.org--are hoping to draw attention to what they see as a Second Amendment guarantee: the right to carry a gun without fear that it will be confiscated. In at least three states--including, oddly, Texas--it is illegal to carry a gun openly. The Supreme Court recently heard arguments in McDonald v. Chicago, a case that will decide whether state and local gun-control ordinances violate the Second Amendment. The court...
...Coffee & Tea and California Pizza Kitchen have done. "Guns are not protest signs," says Paul Helmke, president of the Brady Campaign to Prevent Gun Violence. But because California law prohibits openly carried guns from being loaded, they do seem more like symbols than weapons. Which gun-control proponents might regard as a kind of victory: the guns at Starbucks are no more potent than the espresso...