Training and Spontaneous Reinforcement of Neuronal Assemblies by Spike Timing Plasticity
Abstract
The synaptic connectivity of cortex is plastic, with experience shaping the ongoing interactions between neurons. Theoretical studies of spike timing-dependent plasticity (STDP) have focused on either just pairs of neurons or large-scale simulations. A simple analytic account for how fast spike time correlations affect both microscopic and macroscopic network structure is lacking. We develop a low-dimensional mean field theory for STDP in recurrent networks and show the emergence of assemblies of strongly coupled neurons with shared stimulus preferences. After training, this connectivity is actively reinforced by spike train correlations during the spontaneous dynamics. Furthermore, the stimulus coding by cell assemblies is actively maintained by these internally generated spiking correlations, suggesting a new role for noise correlations in neural coding. Assembly formation has often been associated with firing rate-based plasticity schemes; our theory provides an alternative and complementary framework, where fine temporal correlations and STDP form and actively maintain learned structure in cortical networks.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 03, 2018
- Source ID
- 10.1093/cercor/bhy001
Entities
People
- Brent Doiron
- Gabriel Koch Ocker
Organizations
- Allen Institute for Brain Science
- National Institutes of Health
- National Science Foundation
- Office of Naval Research
- University of Pittsburgh