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Synfire Chains and Cortical Songs: Temporal Modules of Cortical Activity
Yuji Ikegaya,1*
Gloster Aaron,1*
Rosa Cossart,1
Dmitriy Aronov,1
Ilan Lampl,2
David Ferster,2
Rafael Yuste1
Abstract:
How can neural activity propagate through cortical networksbuilt with weak, stochastic synapses? We find precise repetitionsof spontaneous patterns of synaptic inputs in neocortical neuronsin vivo and in vitro. These patterns repeat after minutes, maintainingmillisecond accuracy. Calcium imaging of slices reveals reactivationof sequences of cells during the occurrence of repeated intracellularsynaptic patterns. The spontaneous activity drifts with time,engaging different cells. Sequences of active neurons have distinctspatial structures and are repeated in the same order over tensof seconds, revealing modular temporal dynamics. Higher ordersequences are replayed with compressed timing.
1 Department of Biological Sciences, Columbia University, New York, NY 10027, USA. 2 Department of Neurobiology and Physiology, Northwestern University, Evanston, IL 60208, USA.
To whom correspondence should be addressed. E-mail: rmy5{at}columbia.edu
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Moshe Abeles (23 April 2004) Science304 (5670), 523.
[DOI: 10.1126/science.1097725] |Summary »|Full Text »|PDF »
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