The Fuzzy Logic of Network Connectivity in Mouse Visual Thalamus

Cell. 2016 Mar 24;165(1):192-206. doi: 10.1016/j.cell.2016.02.033.


In an attempt to chart parallel sensory streams passing through the visual thalamus, we acquired a 100-trillion-voxel electron microscopy (EM) dataset and identified cohorts of retinal ganglion cell axons (RGCs) that innervated each of a diverse group of postsynaptic thalamocortical neurons (TCs). Tracing branches of these axons revealed the set of TCs innervated by each RGC cohort. Instead of finding separate sensory pathways, we found a single large network that could not be easily subdivided because individual RGCs innervated different kinds of TCs and different kinds of RGCs co-innervated individual TCs. We did find conspicuous network subdivisions organized on the basis of dendritic rather than neuronal properties. This work argues that, in the thalamus, neural circuits are not based on a canonical set of connections between intrinsically different neuronal types but, rather, may arise by experience-based mixing of different kinds of inputs onto individual postsynaptic cells.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Axons / metabolism
  • Fuzzy Logic
  • Geniculate Bodies / physiology
  • Geniculate Bodies / ultrastructure*
  • Mice
  • Mice, Inbred C57BL
  • Nerve Net / physiology
  • Nerve Net / ultrastructure*
  • Neural Pathways / physiology*
  • Neural Pathways / ultrastructure
  • Retinal Ganglion Cells / metabolism*
  • Synapses
  • Visual Cortex / cytology