Spiral waves in disinhibited mammalian neocortex

Xiaoying Huang, William C. Troy, Qian Yang, Hongtao Ma, Carlo R. Laing, Steven J. Schiff, Jian Young Wu

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Abstract

Spiral waves are a basic feature of excitable systems. Although such waves have been observed in a variety of biological systems, they have not been observed in the mammalian cortex during neuronal activity. Here, we report stable rotating spiral waves in rat neocortical slices visualized by voltage-sensitive dye imaging. Tissue from the occipital cortex (visual) was sectioned parallel to cortical lamina to preserve horizontal connections in layers III-V (500-μm-thick, ∼4 × 6 mm2). In such tangential slices, excitation waves propagated in two dimensions during cholinergic oscillations. Spiral waves occurred spontaneously and alternated with plane, ring, and irregular waves. The rotation rate of the spirals was ×10 turns per second, and the rotation was linked to the oscillations in a one-cycle-one-rotation manner. A small (<128 μm) phase singularity occurred at the center of the spirals, about which were observed oscillations of widely distributed phases. The phase singularity drifted slowly across the tissue (∼1 mm/10 turns). We introduced a computational model of a cortical layer that predicted and replicated many of the features of our experimental findings. We speculate that rotating spiral waves may provide a spatial framework to organize cortical oscillations.

Original languageEnglish (US)
Pages (from-to)9897-9902
Number of pages6
JournalJournal of Neuroscience
Volume24
Issue number44
DOIs
StatePublished - Nov 3 2004

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All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

Cite this

Huang, X., Troy, W. C., Yang, Q., Ma, H., Laing, C. R., Schiff, S. J., & Wu, J. Y. (2004). Spiral waves in disinhibited mammalian neocortex. Journal of Neuroscience, 24(44), 9897-9902. https://doi.org/10.1523/JNEUROSCI.2705-04.2004