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The phrase "perk up your ears" made more sense last year after scientists discovered how the quietest sounds are amplified in the cochlea before being transmitted to the brain.When a sound is barely audible, extremely sensitive inner-ear "hair cells"—which are neurons equipped with tiny, sensory hairs on their surface—pump up the sound by their very motion and mechanically amplify it.
Subtle head motions are amplified by inner-ear hair cells before the signal is reported to the brain, report Marine Biological Laboratory scientists and colleagues. In both the auditory and the vestibular systems, hair cell response is nonlinear: the lower the strength of the stimulus, the more the hair cell amplifies the signal.
(PhysOrg.com) -- Learning how to walk again after long-duration space flights is a problem astronauts face as they readjust to Earth's gravity. To learn how microgravity affects human space travelers, NASA scientists studied the nanomechanics of hair cells in the inner ear.
MOFFETT FIELD, Calif., Feb 5 : Learning how to walk again after long-duration space flights is a problem astronauts face as they readjust to Earth's gravity. To learn how microgravity affects human space travelers, NASA scientists studied the nanomechanics of hair cells in the inner ear.
by Staff Writers Moffett Field CA (SPX) Feb 05, 2010 Learning how to walk again after long-duration space flights is a problem astronauts face as they readjust to Earth's gravity.
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Sleep is one of the great mysteries of life. Like gravity or the quantum field, sleep is so fundamental that scientists still don't know exactly what it is.
When I get home from work, after a cup of tea and a chat, I slump on the bed for a nap, Jim Soar writes. A few seconds later there is a patter of paws on stairs. Something black pokes its nose round the door, pauses, leaps up.
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