&lt;title&gt;Control and amplification of cortical neurodynamics&lt;/title&gt;

Liljenstroem, Hans; Aronsson, Per

doi:10.1117/12.343061

Cited by 2 publications

(1 citation statement)

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“…Electrical gap junctions could play an additional role in the synchrony and stabilization of cortical oscillations (Peinado et al 1993). Simulations with electric and electromagnetic field effects clearly show such an increased synchronization of network units, as well as the observed suppression of high-frequency components (Liljenström & Aronsson 1999). …”

Section: Interscale Interactions In Cortical Neural Networkmentioning

confidence: 99%

Three pertinent issues in the modeling of brain activity: Nonlinearities, time scales, and neural underpinnings

et al. 2000

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Section: Interscale Interactions In Cortical Neural Networkmentioning

confidence: 99%

Three pertinent issues in the modeling of brain activity: Nonlinearities, time scales, and neural underpinnings

et al. 2000

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Toward a quantitative description of large-scale neocortical dynamic function and EEG

Nunez¹

2000

Behav Brain Sci

413

315

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A general conceptual framework for large-scale neocortical dynamics based on data from many laboratories is applied to a variety of experimental designs, spatial scales, and brain states. Partly distinct, but interacting local processes (e.g., neural networks) arise from functional segregation. Global processes arise from functional integration and can facilitate (top down) synchronous activity in remote cell groups that function simultaneously at several different spatial scales. Simultaneous local processes may help drive (bottom up) macroscopic global dynamics observed with electroencephalography (EEG) or magnetoencephalography (MEG).A local/global dynamic theory that is consistent with EEG data and the proposed conceptual framework is outlined. This theory is neutral about properties of neural networks embedded in macroscopic fields, but its global component makes several qualitative and semiquantitative predictions about EEG measures of traveling and standing wave phenomena. A more general “metatheory” suggests what large-scale quantitative theories of neocortical dynamics may be like when more accurate treatment of local and nonlinear effects is achieved.The theory describes the dynamics of excitatory and inhibitory synaptic action fields. EEG and MEG provide large-scale estimates of modulation of these synaptic fields around background levels. Brain states are determined by neuromodulatory control parameters. Purely local states are dominated by local feedback gains and rise and decay times of postsynaptic potentials. Dominant local frequencies vary with brain region. Other states are purely global, with moderate to high coherence over large distances. Multiple global mode frequencies arise from a combination of delays in corticocortical axons and neocortical boundary conditions. Global frequencies are identical in all cortical regions, but most states involve dynamic interactions between local networks and the global system. EEG frequencies may involve a “matching” of local resonant frequencies with one or more of the many, closely spaced global frequencies.

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<title>Control and amplification of cortical neurodynamics</title>

Cited by 2 publications

References 0 publications

Three pertinent issues in the modeling of brain activity: Nonlinearities, time scales, and neural underpinnings

Three pertinent issues in the modeling of brain activity: Nonlinearities, time scales, and neural underpinnings

Toward a quantitative description of large-scale neocortical dynamic function and EEG

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