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Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging

Introduction: The reward network is highly investigated as it is known to be involved in substance addiction and reward sensitivity. Adolescents have been shown to be more reward sensitive compared to other age groups. Previous studies have also shown that the white matter tracts between the fron...

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Main Author: Zabri, Siti Hajar
Format: Thesis
Language:English
Published: 2021
Subjects:
R Medicine
Online Access:http://eprints.usm.my/52417/1/Siti%20Hajar%20Zabri-24%20pages.pdf
http://eprints.usm.my/52417/
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spelling my.usm.eprints.52417 http://eprints.usm.my/52417/ Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging Zabri, Siti Hajar R Medicine Introduction: The reward network is highly investigated as it is known to be involved in substance addiction and reward sensitivity. Adolescents have been shown to be more reward sensitive compared to other age groups. Previous studies have also shown that the white matter tracts between the frontostriatal reward-related brain regions was associated with reward sensitivity. Objective: Since the reward network of female Malaysian Malay adolescents is understudied, the aim of this study was to characterize the white matter structural connectivity of the frontostriatal reward circuit of 15 healthy female Malaysian Malay adolescents by determining the relative connection probability of nucleus accumbens (NAcc) seed region to amygdala, anterior cingulate cortex (ACC), medial orbitofrontal cortex (mOFC), hippocampus, ventrolateral prefrontal cortex (vlPFC) and dorsolateral prefrontal cortex (dlPFC). This study also investigated the pattern of distribution from the parcellation of the NAcc corresponding to the connectivity of the 6 targets. Methodolgy: Diffusion magnetic resonance imaging (dMRI) was used to study the reward structural connectivity via probabilistic tractography which was performed for each subject by calculating the number of streamlines between the seed (NAcc) and each target mask (amygdala, ACC, mOFC, hippocampus, vlPFC and dlPFC). Results: The result showed that the sample with typical reward responsiveness for healthy participants had significantly the highest relative connection probability of NAcc to mOFC, while the NAcc parcellation showed the widest distribution of connection to mOFC compared to the other 5 targets in both sides of the brain. Conclusion: Both of these findings support that NAcc and mOFC have the highest connection strength compared to the 5 targets. This supports previous study that shows NAcc is highly specific to the connection to mOFC. This finding can be explained by prior evidence showing early maturing of the NAcc-mOFC tract. 2021 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/52417/1/Siti%20Hajar%20Zabri-24%20pages.pdf Zabri, Siti Hajar (2021) Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging. Masters thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic R Medicine
spellingShingle R Medicine
Zabri, Siti Hajar
Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging
description Introduction: The reward network is highly investigated as it is known to be involved in substance addiction and reward sensitivity. Adolescents have been shown to be more reward sensitive compared to other age groups. Previous studies have also shown that the white matter tracts between the frontostriatal reward-related brain regions was associated with reward sensitivity. Objective: Since the reward network of female Malaysian Malay adolescents is understudied, the aim of this study was to characterize the white matter structural connectivity of the frontostriatal reward circuit of 15 healthy female Malaysian Malay adolescents by determining the relative connection probability of nucleus accumbens (NAcc) seed region to amygdala, anterior cingulate cortex (ACC), medial orbitofrontal cortex (mOFC), hippocampus, ventrolateral prefrontal cortex (vlPFC) and dorsolateral prefrontal cortex (dlPFC). This study also investigated the pattern of distribution from the parcellation of the NAcc corresponding to the connectivity of the 6 targets. Methodolgy: Diffusion magnetic resonance imaging (dMRI) was used to study the reward structural connectivity via probabilistic tractography which was performed for each subject by calculating the number of streamlines between the seed (NAcc) and each target mask (amygdala, ACC, mOFC, hippocampus, vlPFC and dlPFC). Results: The result showed that the sample with typical reward responsiveness for healthy participants had significantly the highest relative connection probability of NAcc to mOFC, while the NAcc parcellation showed the widest distribution of connection to mOFC compared to the other 5 targets in both sides of the brain. Conclusion: Both of these findings support that NAcc and mOFC have the highest connection strength compared to the 5 targets. This supports previous study that shows NAcc is highly specific to the connection to mOFC. This finding can be explained by prior evidence showing early maturing of the NAcc-mOFC tract.
format Thesis
author Zabri, Siti Hajar
author_facet Zabri, Siti Hajar
author_sort Zabri, Siti Hajar
title Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging
title_short Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging
title_full Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging
title_fullStr Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging
title_full_unstemmed Characterization of the reward structural connectivity in female Malay adolescents using diffusion magnetic resonance imaging
title_sort characterization of the reward structural connectivity in female malay adolescents using diffusion magnetic resonance imaging
publishDate 2021
url http://eprints.usm.my/52417/1/Siti%20Hajar%20Zabri-24%20pages.pdf
http://eprints.usm.my/52417/
_version_ 1732946307160473600
score 13.211869

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