By Spath L.F.
Read Online or Download Additional observations on the invertebrates (chiefly ammonites) of the Jurassic and Cretaceous of East Greenland. II. Some infra-Valanginian ammonites from Lindeman-Fjord, Wollaston Foreland; with a note on the base of the Cretaceous PDF
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Extra info for Additional observations on the invertebrates (chiefly ammonites) of the Jurassic and Cretaceous of East Greenland. II. Some infra-Valanginian ammonites from Lindeman-Fjord, Wollaston Foreland; with a note on the base of the Cretaceous
If signals can travel extensively through astrocyte circuits, then glia at one site could activate distant glia to coordinate the firing of neural networks across regions of the brain. Comparisons of brains reveal that the proportion of glia to neurons increases greatly as animals move up the evolutionary ladder. Haydon wonders whether extensive connectivity among astrocytes might contribute to a greater capacity for learning. He and others are investigating this hypothesis in new experiments. Perhaps a higher concentration of glia, or a more potent type of glia, is what elevates certain humans to genius.
In a classic 1990 study, a group led by Stephen J. Smith of Yale University (now at Stanford University) used calcium imaging to show that the calcium concentration in an astrocyte would rise suddenly when the neurotransmitter glutamate was added to a cell culture. Calcium waves soon spread throughout all the astrocytes in the culture. The astrocytes were responding as if the neurotransmitter had just been released by a neuron, and they were essentially discussing the news of presumed neuronal firing among themselves.
Regret may be one reason for our aversion to losses. Have you ever bought an expensive pair of shoes only to discover that they are so uncomfortable that you cannot wear them for more than 10 minutes without hobbling? Did you toss them out, or are they still sitting in the back of your closet? Chances are you had a hard time throwing them away. Having bought the shoes, you incurred an actual, or “sunk,” cost, and you are going to keep them around in the hope that eventually you will get your money’s worth out of them.