Interactions Between Electrical Activity and Cortical Microcirculation Revealed by Imaging Spectroscopy: Implications for Functional Brain Mapping

DOI Web Site 38 Citations
  • Dov Malonek
    Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel.
  • Amiram Grinvald
    Department of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel.

Abstract

<jats:p>Modern neuroimaging techniques use signals originating from microcirculation to map brain function. In this study, activity-dependent changes in oxyhemoglobin, deoxyhemoglobin, and light scattering were characterized by an imaging spectroscopy approach that offers high spatial, temporal, and spectral resolution. Sensory stimulation of cortical columns initiates tissue hypoxia and vascular responses that occur within the first 3 seconds and are highly localized to individual cortical columns. However, the later phase of the vascular response is less localized, spreading over distances of 3 to 5 millimeters.</jats:p>

Journal

  • Science

    Science 272 (5261), 551-554, 1996-04-26

    American Association for the Advancement of Science (AAAS)

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