It is known that brain performs cognitive functions through the activation of a distributed cortical network, which includes remote cortical regions. With this in mind we have analyzed the spatio-temporal cortical activity based on multichannel EEG recordings during accomplishing cognitive task. As the result, we have revealed typical spatio-temporal structures related to the different levels of cognitive task complexity.
We investigate the dynamics of the networks of 100 identical bistable Hodgkin-Huxley neurons with scale-free, small-world and random topologies. For all of them, we discover a phenomenon when one part of the neurons are in the resting state, while the other one is in the oscillatory regime in a certain area of coupling strength and external current amplitude. We investigate this phenomenon and explain it by neuron interaction similar to the short pulse of external current which is able to switch the neuron regime from resting to oscillatory one and vice versa. We find the differences on this phenomenon for different topologies and investigate the evolution of it with increasing of external current.
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