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Modeliranje in dinamika nevronskih omrežij možganske skorje
ID Gartner, Matej (Author), ID Horvat, Martin (Mentor) More about this mentor... This link opens in a new window, ID Perovnik, Matej (Co-mentor)

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Abstract
Možgani so kompleksna mreža nevronov z zelo prefinjeno delitvijo glede na svojo funkcionalnost. Ključno vlogo pri pomnjenju, pozornosti, mišljenju, govoru in zavesti nosi možganska skorja ali cerebralni korteks. Domnevno najmanjše funkcionalne enote možganske skorje so kortikalni stebri, skupki približno 10000 gosto in navidezno naključno povezanih ekscitatornih (vzbujevalnih) in inhibitornih (dušilnih) nevronov. Za modeliranje dinamike posameznih nevronov je potrebno dobro razumevanje elektrokemičnih lastnosti membrane živčnih celic. Naloga je narediti pregled modelov nevronov pri biološko smiselni izbiri parametrov, nato pa preko simulacij študirati dinamične lastnosti nevronske mreže enega kortikalnega stebra v odvisnosti od jakosti zunanjega vzbujanja in izbire modela nevronov. Iz obstoječe literature sledi, da lahko dinamiko obravnavamo preko projekcije na nizkodimenzionalni prostor. Predlagana študija je zanimiv uvod v zelo široko in intenzivno razvijajoče področje dinamike možganov.

Language:Slovenian
Keywords:Nevron, nevronske mreže, membranski potencial, akcijski potencial, kortikalni stebri, oscilacije, fazni prostor, kompaktni atraktor
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FMF - Faculty of Mathematics and Physics
Year:2023
PID:20.500.12556/RUL-151177 This link opens in a new window
COBISS.SI-ID:166396163 This link opens in a new window
Publication date in RUL:30.09.2023
Views:183
Downloads:21
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Secondary language

Language:English
Title:Modeling and dynamics of cortical neural networks
Abstract:
The brain is a complex neural network with highly sophisticated division according to functionality. The cerebral cortex plays a crucial role in memory, attention, thinking, speech, and consciousness. The allegedly smallest functional units of the cortex are cortical columns, bundles of about 10,000 densely and seemingly randomly connected excitatory and inhibitory neurons. Modeling the dynamics of individual neurons requires a good understanding of the electrochemical properties of nerve cell membranes. The task is to review neuron models with a biologically meaningful parameter selection, and then to study through simulations the dynamic properties of a neural network of one cortical column depending on the strength of external excitation and the choice of neuron model. From the existing literature, it follows that the dynamics can be examined through projection into a low-dimensional space. The proposed study is an interesting introduction to a very broad and intensively developing field of brain dynamics.

Keywords:Neuron, neural networks, membrane potential, action potential, cortical columns, oscillations, phase portret, compact attractor

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