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A thalamo–cortico–thalamic neural mass model to study alpha rhythms in Alzheimer’s disease

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Bhattacharya, Basab, Coyle, Damien and Maguire, LP (2011) A thalamo–cortico–thalamic neural mass model to study alpha rhythms in Alzheimer’s disease. Neural Networks Special Issue: Neurocomputational Models of Brain Disorders, 24 (6). pp. 631-645. [Journal article]

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URL: http://dx.doi.org/10.1016/j.neunet.2011.02.009

DOI: doi:10.1016/j.neunet.2011.02.009

Abstract

We present a lumped computational model of the thalamo–cortico–thalamic circuitry. The model essentially consists of two modules: a thalamic module and a cortical module. The thalamic module circuitry is a modified version of a classic neural mass computational model of the thalamic circuitry to simulate cortical alpha rhythms and which we have used in previous research to study EEG abnormality associated with Alzheimer’s Disease (AD). Here, we introduce a modified synaptic structure representing a neuronal population in the thalamic model. Furthermore, the synaptic organisation and connectivity parameter values in the model are based on experimental data reported from the dorsal Lateral Geniculate Nucleus of different species. The cortical module circuitry is based on a recent work studying cortical brain rhythms. We vary the synaptic connectivity parameters in the thalamic module of the model to simulate the effects of AD on brain synaptic circuitry and study power within the alpha frequency bands. The power and dominant frequencies of the model output are studied in three sub-bands within the alpha band: lower alpha (7–9 Hz), middle alpha (9–11 Hz) and upper alpha (11–13 Hz). Such an analytical method conforms to recent comparative EEG studies on young adults, healthy aged adults and MCI or early stage AD patients. The results show a remarkable role of the synaptic connectivities in the inhibitory thalamic cell populations on the alpha band power and frequency. Furthermore, the total number of active synapses in the thalamic cell populations produces the slowing of alpha rhythms and a simultaneous decrease of alpha band power in the brain as a result of AD.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Computing and Intelligent Systems
Research Institutes and Groups:Computer Science Research Institute
Computer Science Research Institute > Intelligent Systems Research Centre
ID Code:17657
Deposited By:Dr Damien Coyle
Deposited On:29 Mar 2011 14:29
Last Modified:04 Jul 2011 14:29

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