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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- About Us
For Whom the Bell Tolls
24 September 1999 6:30 pm
Today is the birthday of Ivar Pavlov, a Russian physiologist born in 1849 who is best known for his studies of the conditioning of dogs. Between 1890 and 1900, Pavlov investigated the secretory mechanisms of digestion in animals. In his most famous experiment, he fitted dogs with a tube on the cheek to measure their saliva production. Each time Pavlov showed the dogs food, he rang a bell, a neutral stimulus with no natural meaning for the dogs. He discovered that if this association was repeated enough times, the bell ringing alone would trigger salivation. Pavlov was awarded the Nobel Prize in physiology or medicine in 1904 for his 1897 work, "Lectures on the Work of the Principal Digestive Gland," which summarized his research findings.
[Source: Roy Porter, Ed., The Biographical Dictionary of Scientists (Oxford University Press, ed. 2, 1994).]