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  • Animals  (2)
  • 2000-2004  (2)
  • 1995-1999
  • 2004  (2)
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  • 2000-2004  (2)
  • 1995-1999
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  • 1
    Publication Date: 2004-06-12
    Description: During speech acquisition, children form quick and rough hypotheses about the meaning of a new word after only a single exposure-a process dubbed "fast mapping." Here we provide evidence that a border collie, Rico, is able to fast map. Rico knew the labels of over 200 different items. He inferred the names of novel items by exclusion learning and correctly retrieved those items right away as well as 4 weeks after the initial exposure. Fast mapping thus appears to be mediated by general learning and memory mechanisms also found in other animals and not by a language acquisition device that is special to humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaminski, Juliane -- Call, Josep -- Fischer, Julia -- New York, N.Y. -- Science. 2004 Jun 11;304(5677):1682-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental and Comparative Psychology, Max-Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15192233" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Dogs ; *Learning ; Male ; *Memory ; Random Allocation ; *Vocabulary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2004-03-27
    Description: In the nervous system of vertebrates, myelination is essential for rapid and accurate impulse conduction. Myelin thickness depends on axon fiber size. We use mutant and transgenic mouse lines to show that axonal Neuregulin-1 (Nrg1) signals information about axon size to Schwann cells. Reduced Nrg1 expression causes hypomyelination and reduced nerve conduction velocity. Neuronal overexpression of Nrg1 induces hypermyelination and demonstrates that Nrg1 type III is the responsible isoform. We suggest a model by which myelin-forming Schwann cells integrate axonal Nrg1 signals as a biochemical measure of axon size.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Michailov, Galin V -- Sereda, Michael W -- Brinkmann, Bastian G -- Fischer, Tobias M -- Haug, Bernhard -- Birchmeier, Carmen -- Role, Lorna -- Lai, Cary -- Schwab, Markus H -- Nave, Klaus-Armin -- New York, N.Y. -- Science. 2004 Apr 30;304(5671):700-3. Epub 2004 Mar 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurogenetics, Max Planck Institute of Experimental Medicine, 37075 Gottingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15044753" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology/*ultrastructure ; Ganglia, Spinal/chemistry ; Gene Targeting ; Genes, erbB ; Genes, erbB-2 ; Heterozygote ; Mice ; Mice, Knockout ; Mice, Transgenic ; Models, Neurological ; Myelin Sheath/*physiology/*ultrastructure ; Neural Conduction ; Neuregulin-1/genetics/*physiology ; Protein Isoforms/physiology ; Receptor, Epidermal Growth Factor/analysis/physiology ; Receptor, ErbB-2/analysis/physiology ; Receptor, ErbB-3/analysis/physiology ; Schwann Cells/physiology ; Sciatic Nerve/chemistry ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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