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A classical view of neural coding relies on temporal firing synchrony amongfunctional groups of neurons; however the underlying mechanism remains anenigma. Here we experimentally demonstrate a mechanism where time-lags amongneuronal spiking leap from several tens of milliseconds to nearly zero-lagsynchrony. It also allows sudden leaps out of synchrony, hence forming shortepochs of synchrony. Our results are based on an experimental procedure whereconditioned stimulations were enforced on circuits of neurons embedded within alarge-scale network of cortical cells in vitro and are corroborated bysimulations of neuronal populations. The underlying biological mechanisms arethe unavoidable increase of the neuronal response latency to ongoingstimulations and temporal or spatial summation required to generate evokedspikes. These sudden leaps in and out of synchrony may be accompanied bymultiplications of the neuronal firing frequency, hence offering reliableinformation-bearing indicators which may bridge between the two principalneuronal coding paradigms.

Sudden synchrony leaps accompanied by frequency multiplications in neuronal activity