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News Physiol Sci 17: 110-114, 2002;
1548-9213/02 $5.00
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News in Physiological Sciences, Vol. 17, No. 3, 110-114, June 2002
© 2002 Int. Union Physiol. Sci./Am. Physiol. Soc.

Vision: How to Catch Fast Signals With Slow Detectors

Gian Carlo Demontis and Luigi Cervetto

Dipartimento di Psichiatria e Neurobiologia, Università di Pisa, I-56126 Pisa, Italy
The visual system is equipped with highly sensitive but slow detectors, yet it can resolve light changes up to 60 Hz. Processes taking place in retinal circuits go beyond the intrinsic limits of the transduction machinery by an unconventional exploitation of voltage-dependent conductances, cleverly lined up to generate a cascade of band-pass amplification stages.






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