Word: retinas
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Greka is finishing work in a vision research laboratory at Boston Children's Hospital on her project: "Molecular Cloning and Characterization of GABAc Receptors in Mouse Retina...
...enduring image of the Los Angeles Police Department--cops whaling away with nightsticks at a prostrate victim--was engraved on the nation's retina by the Rodney King beating in 1991. Greg Dossey's job for the past few years has been to reverse not just that image but the reality behind it as well. His efforts, along with some department-wide soul-searching, are paying off. There were 583 misconduct claims against Los Angeles police officers last year, about half the number recorded a decade earlier. Sixteen cases made it to court--by far the lowest number since...
...scientists could eavesdrop on the brain of a human embryo 10, maybe 12 weeks after conception, they would hear an astonishing racket. Inside the womb, long before light first strikes the retina of the eye or the earliest dreamy images flicker through the cortex, nerve cells in the developing brain crackle with purposeful activity. Like teenagers with telephones, cells in one neighborhood of the brain are calling friends in another, and these cells are calling their friends, and they keep calling one another over and over again, "almost," says neurobiologist Carla Shatz of the University of California, Berkeley...
...University of California at San Francisco. What sorts out the mess, scientists have established, is neural activity. In a series of experiments viewed as classics by scientists in the field, Berkeley's Shatz chemically blocked neural activity in embryonic cats. The result? The axons that connect neurons in the retina of the eye to the brain never formed the left eye-right eye geometry needed to support vision...
...example, children who are born with a cataract will become permanently blind in that eye if the clouded lens is not promptly removed. Why? The brain's visual centers require sensory stimulus--in this case the stimulus provided by light hitting the retina of the eye--to maintain their still tentative connections. More controversially, many linguists believe that language skills unfold according to a strict, biologically defined timetable. Children, in their view, resemble certain species of birds that cannot master their song unless they hear it sung at an early age. In zebra finches the window for acquiring the appropriate...