Dendritic organization of sensory input to cortical neurons in vivo

Hongbo Jia, Nathalie L. Rochefort, Xiaowei Chen, Arthur Konnerth*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

In sensory cortex regions, neurons are tuned to specific stimulus features. For example, in the visual cortex, many neurons fire predominantly in response to moving objects of a preferred orientation. However, the characteristics of the synaptic input that cortical neurons receive to generate their output firing pattern remain unclear. Here we report a novel approach for the visualization and functional mapping of sensory inputs to the dendrites of cortical neurons in vivo. By combining high-speed two-photon imaging with electrophysiological recordings, we identify local subthreshold calcium signals that correspond to orientation-specific synaptic inputs. We find that even inputs that share the same orientation preference are widely distributed throughout the dendritic tree. At the same time, inputs of different orientation preference are interspersed, so that adjacent dendritic segments are tuned to distinct orientations. Thus, orientation-tuned neurons can compute their characteristic firing pattern by integrating spatially distributed synaptic inputs coding for multiple stimulus orientations.

Original languageEnglish
Pages (from-to)1307-1312
Number of pages6
JournalNature
Volume464
Issue number7293
DOIs
Publication statusPublished - 29 Apr 2010

Keywords / Materials (for Non-textual outputs)

  • CALCIUM DYNAMICS
  • MOUSE VISUAL-CORTEX
  • SPINES
  • RECEPTIVE-FIELDS
  • POTENTIALS
  • NEOCORTICAL PYRAMIDAL NEURONS
  • CELLS
  • SYNAPTIC INTEGRATION
  • BASAL DENDRITES
  • FUNCTIONAL ARCHITECTURE

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