Oscillations phase coherence feedback12/27/2023 It has been suggested that the intrinsic resonance properties of population activities in these areas might contribute to enabling successful communication. The cortex is organized as a modular system, with the modules (cortical areas) communicating via weak long-range connections. Thus, our results suggest a new functional role of bidirectional connectivity for the communication in cortical area networks. Moreover, it distinctly lowers the threshold for successful communication by synchronous spiking in modular networks of weakly coupled networks. The transmission is much faster, by more than a factor of two, than in the original CTR mechanism. The key condition for successful transmission is that the sum of the forward and backward delays in the resonance pair matches the resonance frequency of the network modules. Specifically, we show that adding feedback connections between two upstream modules, called the resonance pair, in an otherwise feedforward modular network can support successful propagation of a single PP throughout the entire network. Here, we show that, by adding appropriate feedback connections to the network, the CTR mechanism can be improved and the aforementioned constraints relaxed. Third, transmission is very slow, because in each module, the network resonance needs to build up over multiple oscillation cycles. Second, the inter-PP interval needs to match the network resonance. First, it needs periodic trains of PPs, whereas single PPs fail to propagate. This mechanism has three severe constraints, though. Hence, the mechanism was termed communication through resonance (CTR). The condition for successful transmission is that the pulse packet (PP) intervals match the period of the modules’ resonance frequency. Recently, it has been shown that this resonance property of EI-networks can be exploited for communication in modular neuronal networks by enabling the transmission of sequences of synchronous spike volleys (’pulse packets’), despite the sparse and weak connectivity between the modules. These evoked oscillations are the generic response of networks of excitatory and inhibitory neurons ( EI-networks) to a transient external input. Transient oscillations in network activity upon sensory stimulation have been reported in different sensory areas of the brain.
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