Cortical modulation of neuronal activity in the cat's lateral geniculate and perigeniculate nuclei: a modeling study
© Rogala et al; licensee BioMed Central Ltd. 2011
Published: 18 July 2011
The role of cortical feedback in thalamo-cortical processing loop have been extensively investigated over the last decades. In general, these studies focused on cortical feedback exerted over lateral geniculate nucleus (LGN) principal cells, only in several cases the effects of cortical inactivation were investigated simultaneously in both thalamic relay cells and perigeniculate nucleus (PGN) inhibitory neurons. In the previous study  we showed in the cat that cessation of cortical input by cooling of visual cortex (areas 17 and 18) decreased spontaneous activity of LGN relay cells and increased spontaneous activity of PGN neurons. In contrast, visually evoked responses of most PGN neurons and LGN principal cells both decreased.
To identify network mechanisms underlying such functional changes we conducted a modelling study in NEURON on several networks of point neurons with varied model parameters, such as membrane properties, synaptic weights and axonal delays. We considered five network topologies of the retino-geniculo-cortical pathway [2–6].
Mean spontaneous activity (spikes/s) for tested models (mean of 30 repetitions) and t-test P values.
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