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  • 1
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    Tuned responses of astrocytes and their influence on hemodynamic signals in the visual cortex (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2008-06-21
    Description: Astrocytes have long been thought to act as a support network for neurons, with little role in information representation or processing. We used two-photon imaging of calcium signals in the ferret visual cortex in vivo to discover that astrocytes, like neurons, respond to visual stimuli, with distinct spatial receptive fields and sharp tuning to visual stimulus features including orientation and spatial frequency. The stimulus-feature preferences of astrocytes were exquisitely mapped across the cortical surface, in close register with neuronal maps. The spatially restricted stimulus-specific component of the intrinsic hemodynamic mapping signal was highly sensitive to astrocyte activation, indicating that astrocytes have a key role in coupling neuronal organization to mapping signals critical for noninvasive brain imaging. Furthermore, blocking astrocyte glutamate transporters influenced the magnitude and duration of adjacent visually driven neuronal responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schummers, James -- Yu, Hongbo -- Sur, Mriganka -- New York, N.Y. -- Science. 2008 Jun 20;320(5883):1638-43. doi: 10.1126/science.1156120.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18566287" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aspartic Acid/pharmacology ; Astrocytes/drug effects/*physiology ; Blood Volume ; Brain Mapping ; Calcium/metabolism ; Calcium Signaling ; Cerebrovascular Circulation ; Ferrets ; Fluorescent Dyes ; Glutamic Acid/metabolism ; Male ; Microscopy, Confocal ; Neurons/*physiology ; Neurotransmitter Agents/metabolism ; Photic Stimulation ; Synapses/physiology ; Visual Cortex/blood supply/cytology/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Patterning and plasticity of the cerebral cortex (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-11-08
    Description: The cerebral cortex of the human brain is a sheet of about 10 billion neurons divided into discrete subdivisions or areas that process particular aspects of sensation, movement, and cognition. Recent evidence has begun to transform our understanding of how cortical areas form, make specific connections with other brain regions, develop unique processing networks, and adapt to changes in inputs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sur, Mriganka -- Rubenstein, John L R -- New York, N.Y. -- Science. 2005 Nov 4;310(5749):805-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., 46-6237, Cambridge, MA 02139, USA. msur@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16272112" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/physiology ; *Body Patterning ; Brain Mapping ; Cerebral Cortex/anatomy & histology/*growth & development/metabolism/*physiology ; Dominance, Ocular ; Gene Expression Regulation, Developmental ; Humans ; Models, Neurological ; Morphogenesis ; Nerve Net/physiology ; Neural Pathways/growth & development/physiology ; *Neuronal Plasticity ; Thalamus/anatomy & histology/growth & development/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Retinogeniculate terminations in cats: morphological differences between X and Y cell axons (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-22
    Description: We injected horseradish peroxidase into single, physiologically identified, optic tract axons of X and Y cells in cats and studied their termination patterns in the lateral geniculate nucleus. All X cell axons innervate lamina A or A1 in narrow zones, and some sparsely innervate the medical interlaminar nucleus. All Y cell axons have broad terminal zones in laminae A and C (from the contralateral retina) or lamina A1 (if ipsilateral), and most innervate the medial interlaminar nucleus densely.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sur, M -- Sherman, S M -- EY 03038/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1982 Oct 22;218(4570):389.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7123239" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain Mapping ; Cats ; Functional Laterality ; Geniculate Bodies/cytology ; Horseradish Peroxidase ; Retina/cytology ; Visual Pathways/*cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Multiple representations of the body within the primary somatosensory cortex of primates (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-04
    Description: Microelectrode mapping experiments indicate that the classical primary somatosensory cortex of monkeys consists of as many as four separate body representations rather than just one. Two complete body surface representations occupy cortical fields 3b and 1. In addition, area 2 contains an orderly representation of predominantly "deep" body tissues. Area 3a may constitute a fourth representation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaas, J H -- Nelson, R J -- Sur, M -- Lin, C S -- Merzenich, M M -- New York, N.Y. -- Science. 1979 May 4;204(4392):521-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/107591" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain Mapping ; Evoked Potentials ; Haplorhini/*anatomy & histology/physiology ; Somatosensory Cortex/*anatomy & histology/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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