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Behavior Discrimination Using a Discrete Wavelet Based Approach for Feature Extraction on Local Field Potentials in the Cortex and Striatum
KTH, Skolan för datavetenskap och kommunikation (CSC), Beräkningsbiologi, CB. KTH, Skolan för datavetenskap och kommunikation (CSC), Beräkningsvetenskap och beräkningsteknik (CST).
Lund University.
Lund University.
Lund University.
Vise andre og tillknytning
2015 (engelsk)Inngår i: 7th International IEEE/EMBS Conference on Neural Engineering (NER), IEEE conference proceedings, 2015, Vol. 7, s. 964-967Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Linkage between behavioral states and neural activity is one of the most important challenges in neuroscience. The network activity patterns in the awake resting state and in the actively behaving state in rodents are not well understood, and a better tool for differentiating these states can provide insights on healthy brain functions and its alteration with disease. Therefore, we simultaneously recorded local field potentials (LFPs) bilaterally in motor cortex and striatum, and measured locomotion from healthy, freely behaving rats. Here we analyze spectral characteristics of the obtained signals and present an algorithm for automatic discrimination of the awake resting and the behavioral states. We used the Support Vector Machine (SVM) classifier and utilized features obtained by applying discrete wavelet transform (DWT) on LFPs, which arose as a solution with high accuracy.

sted, utgiver, år, opplag, sider
IEEE conference proceedings, 2015. Vol. 7, s. 964-967
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-168488DOI: 10.1109/NER.2015.7146786ISI: 000377414600242Scopus ID: 2-s2.0-84940386288OAI: oai:DiVA.org:kth-168488DiVA, id: diva2:816780
Konferanse
7th Annual International IEEE EMBS Conference on Neural Engineering
Merknad

QC 20150623

Tilgjengelig fra: 2015-06-04 Laget: 2015-06-04 Sist oppdatert: 2018-02-09bibliografisk kontrollert
Inngår i avhandling
1. Untangling Cortico-Striatal Circuitry and its Role in Health and Disease - A computational investigation
Åpne denne publikasjonen i ny fane eller vindu >>Untangling Cortico-Striatal Circuitry and its Role in Health and Disease - A computational investigation
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The basal ganglia (BG) play a critical role in a variety of regular motor and cognitive functions. Many brain diseases, such as Parkinson’s diseases, Huntington’s disease and dyskinesia, are directly related to malfunctions of the BG nuclei. One of those nuclei, the input nucleus called the striatum, is heavily connected to the cortex and receives afferents from nearly all cortical areas. The striatum is a recurrent inhibitory network that contains several distinct cell types. About 95% of neurons in the striatum are medium spiny neurons (MSNs) that form the only output from the striatum. Two of the most examined sources of GABAergic inhibition into MSNs are the feedback inhibition (FB) from the axon collaterals of the MSNs themselves, and the feedforward inhibition (FF) via the small population (1-2% of striatal neurons) of fast spiking interneurons (FSIs). The cortex sends direct projections to the striatum, while the striatum can affect the cortex only indirectly through other BG nuclei and the thalamus. Understanding how different components of the striatal network interact with each other and influence the striatal response to cortical inputs has crucial importance for clarifying the overall functions and dysfunctions of the BG.

    In this thesis I have employed advanced experimental data analysis techniques as well as computational modelling, to study the complex nature of cortico-striatal interactions. I found that for pathological states, such as Parkinson’s disease and L-DOPA-induced dyskinesia, effective connectivity is bidirectional with an accent on the striatal influence on the cortex. Interestingly, in the case of L-DOPA-induced dyskinesia, there was a high increase in effective connectivity at ~80 Hz and the results also showed a large relative decrease in the modulation of the local field potential amplitude (recorded in the primary motor cortex and sensorimotor striatum in awake, freely behaving, 6-OHDA lesioned hemi-parkinsonian rats) at ~80 Hz by the phase of low frequency oscillations. These results suggest a lack of coupling between the low frequency activity of a presumably larger neuronal population and the synchronized activity of a presumably smaller group of neurons active at 80 Hz.

    Next, I used a spiking neuron network model of the striatum to isolate the mechanisms underlying the transmission of cortical oscillations to the MSN population. I showed that FSIs play a crucial role in efficient propagation of cortical oscillations to the MSNs that did not receive direct cortical oscillations. Further, I have identified multiple factors such as the number of activated neurons, ongoing activity, connectivity, and synchronicity of inputs that influenced the transfer of oscillations by modifying the levels of FB and FF inhibitions. Overall, these findings reveal a new role of FSIs in modulating the transfer of information from the cortex to striatum. By modulating the activity and properties of the FSIs, striatal oscillations can be controlled very efficiently. Finally, I explored the interactions in the striatal network with different oscillation frequencies and showed that the features of those oscillations, such as amplitude and frequency fluctuations, can be influenced by a change in the input intensities into MSNs and FSIs and that these fluctuations are also highly dependent on the selected frequencies in addition to the phase offset between different cortical inputs.

    Lastly, I investigated how the striatum responds to cortical neuronal avalanches. Recordings in the striatum revealed that striatal activity was also characterized by spatiotemporal clusters that followed a power law distribution albeit, with significantly steeper slope. In this study, an abstract computational model was developed to elucidate the influence of intrastriatal inhibition and cortico-striatal interplay as important factors to understand the experimental findings. I showed that one particularly high activation threshold of striatal nodes can reproduce a power law-like distribution with a coefficient similar to the one found experimentally. By changing the ratio of excitation and inhibition in the cortical model, I saw that increased activity in the cortex strongly influenced striatal dynamics, which was reflected in a less negative slope of cluster size distributions in the striatum.  Finally, when inhibition was added to the model, cluster size distributions had a prominently earlier deviation from the power law distribution compared to the case when inhibition was not present. 

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2018. s. 88
Serie
TRITA-EECS-AVL ; 2018:9
Emneord
cortico-striatal circuits, levodopa-induced dyskinesia, Parkinson’s disease, effective connectivity, cross-frequency coupling, corticostriatal network, network oscillations, GABAergic transmission. basal ganglia, striatum, cortex, fast spiking interneurons, medium spiny neurons, neuronal avalanches
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-222467 (URN)978-91-7729-676-8 (ISBN)
Disputas
2018-03-05, F3, Lindstedtsvägen 26, KTH Campus, Stockholm, 13:15 (engelsk)
Opponent
Veileder
Merknad

QC 20180209

Tilgjengelig fra: 2018-02-09 Laget: 2018-02-09 Sist oppdatert: 2018-06-12bibliografisk kontrollert

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