Abstract
The brain propagates neuronal signals accurately and rapidly. Nevertheless, whether and how a pool of cortical neurons transmits an undistorted message to a target remains unclear. We apply optogenetic white noise signals to small assemblies of cortical pyramidal cells (PYRs) in freely moving mice. The directly activated PYRs exhibit a spike timing precision of several milliseconds. Instead of losing precision, interneurons driven via synaptic activation exhibit higher precision with respect to the white noise signal. Compared with directly activated PYRs, postsynaptic interneuron spike trains allow better signal reconstruction, demonstrating error correction. Data-driven modeling shows that nonlinear amplification of coincident spikes can generate error correction and improved precision. Over multiple applications of the same signal, postsynaptic interneuron spiking is most reliable at timescales ten times shorter than those of the presynaptic PYR, exhibiting temporal coding. Similar results are observed in hippocampal region CA1. Coincidence detection of convergent inputs enables messages to be precisely propagated between cortical PYRs and interneurons.
Original language | English |
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Article number | 111383 |
Journal | Cell Reports |
Volume | 40 |
Issue number | 12 |
DOIs | |
State | Published - 20 Sep 2022 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2022 The Author(s)
Keywords
- CP: Neuroscience
- coding
- electrophysiology
- extracellular
- freely moving
- hippocampus
- mouse model
- neocortex
- optogenetics
- spike transmission
- synaptic connectivity
- temporal precision
ASJC Scopus subject areas
- General Biochemistry, Genetics and Molecular Biology