Research master thesis | Psychology (research) (MSc)
under embargo until 2024-08-31
2024-08-31T00:00:00Z
Prior studies have shown ambiguous results concerning the question if and how cognitive performance and neurophysiological markers change under the influence of weightlessness. Additional research...Show morePrior studies have shown ambiguous results concerning the question if and how cognitive performance and neurophysiological markers change under the influence of weightlessness. Additional research is necessary to confirm effects and shed light on experimental and interindividual differences and those related to various mechanisms underlying cognitive processes. This study aimed to assess the influence of microgravity on the neurocognitive marker P3 during parabolic flight. METHODS: Participants were trained to perform a brain-computer interface (BCI) task, which included a visual oddball paradigm task. Nine participants performed this task during parabolic flight. Statistic analyses assessed the amplitude and latency of the P3 event-related potential (ERP). RESULTS: Results revealed no significant differences for P3 Amplitude nor Latency in the 0G condition versus the 1G condition. The amplitude for oddball stimuli was significantly higher than the amplitude for standard stimuli in both 1G and 0G. CONCLUSION: There needs to be greater consensus and understanding concerning the effects of microgravity on cognitive performance and ERPs. The data presented here does not verify that short bouts of microgravity could enhance nor diminish neuro-behavioral performance. It does confirm that the visual-based oddball paradigm is feasible in microgravity conditions.Show less
Research master thesis | Psychology (research) (MSc)
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In PTSD research, script-driven imagery procedures are used to induce fear expression in traumatized participants but no consensus on a standard script for research has been established yet. This...Show moreIn PTSD research, script-driven imagery procedures are used to induce fear expression in traumatized participants but no consensus on a standard script for research has been established yet. This study fills a research gap by being the first to directly compare two contemporary imagery script procedures to evaluate their feasibility. We hypothesized an audio-scripted imagery procedure to lead to higher fear expression (heart rate, skin conductance, subjective distress) than an imagery-only script. A moderating effect of the vividness of the stressful memory on fear expression was also hypothesized. In a between-subjects design, participants (N = 37) were sorted into two conditions and were interviewed regarding a stressful life experience. Fear expression was measured during baseline and imagery. Contrary to expectations, both procedures led to a similar increase in fear expression. Crucially, the audio-scripted imagery procedure might be especially effective for participants with a high baseline vividness of the stressful memory which has implications for future PTSD research. Upcoming studies should investigate changes to the script procedures to facilitate comparison between scripts and further explore the effect of script procedures on high-vividness participants.Show less
Research master thesis | Linguistics (research) (MA)
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This thesis investigates a recurring issue found in fieldwork on Niger-Congo and Nilo-Saharan languages: how can a linguist tell if a given language has the vowels [ɪ ʊ], or [e o], or both? These...Show moreThis thesis investigates a recurring issue found in fieldwork on Niger-Congo and Nilo-Saharan languages: how can a linguist tell if a given language has the vowels [ɪ ʊ], or [e o], or both? These two pairs of vowels – which differ in their height and ATR (‘advanced tongue root’) value – are notoriously difficult to tell apart acoustically, and their pronunciation varies considerably between languages and even speakers. Moreover, previous studies have only focused on how to distinguish these vowels in languages with both pairs; in languages with just one pair, how do we know if that pair is [ɪ ʊ] or [e o]? To address this gap, the main acoustic study of this thesis looks at data from Boa-Leboale, a Bantu language spoken in the Democratic Republic of the Congo that has historically been described as only having [ɪ ʊ], not [e o]. Using the results and acoustic methodology of Starwalt’s (2008) landmark study, I construct a number of hypotheses to test two research questions; research question (I) investigates whether Boa-Leboale has one or two pairs of vowels and research question (II) attempts to identify whether a given set of vowels is more likely to be [ɪ ʊ] or [e o]. The results of this study indicate that Boa-Leboale does indeed have only one pair of vowels, and those vowels are most likely [ɪ ʊ], as suggested by previous descriptions. Given this promising result, I hope that further studies will be able to improve on the study presented here and solve the issue of identifying these vowels acoustically not just for Boa-Leboale, but for any language.Show less
Research master thesis | Middle Eastern Studies (research) (MA)
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When the reformist Mohammad Khatami (b. 1943) became president of Iran in 1997, most socioeconomic strata, workers and students in particular, expected changes to Iran’s political and economic make...Show moreWhen the reformist Mohammad Khatami (b. 1943) became president of Iran in 1997, most socioeconomic strata, workers and students in particular, expected changes to Iran’s political and economic make-up. These expectations were largely grounded in Khatami’s rhetoric of social justice and the promises of more socio-political and cultural freedoms that he voiced during his electoral campaign. In practice, however, these promises did not materialise and disappointed workers and students alike. Khatami continued the economic neoliberalisation that his predecessor Rafsanjani (r. 1989-1997) had begun and the supreme leader, Khamenei (r. 1989-), heavily resisted his attempts to create more relaxed academic settings. Although the existing literature explains why Khatami and Khamenei, which respectively represented the reformist and conservative sides of the political spectrum, embraced different labour policy-paths, it does not seek to understand how both officials constructed their social reality such that it made sense for them to do so. Presuming that the meaning of political factions is objectively defined, the literature therefore foregoes enquiring after the discursive context in which they constructed their ideologies and how these related to their policy-paths. However, as policies do not originate in an intellectual and institutional vacuum but are made possible in a political context where competing discourses interact, examining them from a discursive perspective clarifies how rather than why these officials perceived them as meaningful paths to pursue. This focus on ideology construction then leads to enquiring how both constructed Iran’s identity and, by implication, that of workers and students. Taking a poststructuralist approach, this thesis therefore enquires how Khatami’s and Khamenei’s evolving discursive negotiation on Iranian identity was co-constitutionally related to the approved labour policies that concerned workers and students during Khatami’s presidency (r. 1997-2005).Show less
Research master thesis | Asian Studies (research) (MA)
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Contrary to the stereotype that Zhang Shi 張栻 (1133-1181) always followed Zhu Xi’s 朱熹 (1130-1200) ideas, this thesis, by examining Zhang’s social origins, socio-political thoughts, and disciples,...Show moreContrary to the stereotype that Zhang Shi 張栻 (1133-1181) always followed Zhu Xi’s 朱熹 (1130-1200) ideas, this thesis, by examining Zhang’s social origins, socio-political thoughts, and disciples, argues that Zhang represents a transitional Neo-Confucianism, which is based on exiled bureaucrat and emphasizes military-fiscal skills and state activism. Zhang Shi learning provides an alternative to statism Wang Anshi 王安石 (1021-1086) learning in the Northern Song (960-1127) and typical Neo-Confucianism represented by Zhu Xi and Lu Jiuxuan 陸九淵 (1139-1191) in Southern Song (1127-1279) , which is based on local spontaneous elites and emphasizes the role of society and local volunteerism. The social origin and foundation of this transitional Neo-Confucianism was the former (potential) capital bureaucratic family who were exiled due to the fall of the Northern Song. They took the northern expedition to return to the capital as their goal and gave up the run of their hometowns and the local communities in which they lived. They were skeptical of Zhu Xi’s social program, such as the community compacts (xiangyang 鄉約), the community granaries (shecang 社倉) and private commercial publishing, which later became the typical behavior of Neo-Confucian. Based on the ideas of Mencius (Mengzi 孟子), Zhang Shi developed the theory of “spontaneous disinterestedness” (wu suowei er ran 無所為而然), which underpinned his ideas on the distinction between righteousness/public/king and profit/selfish/hegemon. Though Zhang learning relied on the state, it cut sharply with Wang learning in the aspect of “motivation”. For Zhang, the power of the state was not an end in itself, but rather the state should be consistent with the spontaneous disinterestedness from the heavenly principle. With a particular emphasis on military-fiscal skills, Zhang and his disciples sought to take over the state apparatus left behind by Wang Anshi’s reforms and to make this state act out of righteousness in the hands of Neo-Confucianism gentlemen. Zhang and his disciples proposed and participated in all the northern expeditions during the Southern Song period. However, the northern capital could never be returned, and the number of exiled bureaucrats who were the social base of Zhang learning (and of the Huxiang 湖湘 school in general) dwindled over time. Zhu Xi, who came from a family of low-ranking exiled bureaucrats, found a new world in the local community in the south, and endeavored to transform himself into a member of the local elite, stepping out from behind Zhang Shi. After Zhang’s death, the local students he left behind in Hunan 湖南 and Sichuan 四川 were eventually aborted by the emerging typical Neo-Confucianism (Zhu Xi and Lu Jiuyuan school) that spoke for the local elites. Zhang as a kind of transitional Neo-Confucianism eventually faded from history, completing the transition from the Northern Song learning to the later typical Neo-Confucianism. By reframing this transitional and alternative Neo-Confucianism, this thesis refines the Hymes-Bol’s localism paradigm about the explanation of why and how Neo-Confucianism raised.Show less
Research master thesis | Psychology (research) (MSc)
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Introduction: Selective serotonin reuptake inhibitors (SSRI’s) are an effective treatment for many depressed patients, but their disadvantages include a wide range of side effects and a delayed...Show moreIntroduction: Selective serotonin reuptake inhibitors (SSRI’s) are an effective treatment for many depressed patients, but their disadvantages include a wide range of side effects and a delayed treatment response. In contrast, subanesthetic doses of ketamine show acute antidepressant effects. Previous functional connectivity findings implicate the ventromedial prefrontal cortex (vmPFC) and posterior cingulate cortex (PCC), key areas of the default mode network (DMN), in ketamine’s acute antidepressant effect. In addition, psilocybin has also shown acute antidepressant effects with a potential role for the claustrum, an area functionally connected to the DMN. However, pharmacological fMRI findings concerning acute antidepressant drug action may be moderated by the decision to include or exclude a controversial preprocessing step called global signal regression (GSR). In this study, we investigated ketamine’s acute effects on functional connectivity patterns in the brain in order to probe the underlying mechanism of its acute antidepressant effects. Hypotheses: Ketamine acutely decreases functional connectivity between the vmPFC and PCC and between the DMN and claustrum. In addition, these findings will not be affected by the decision to include or exclude GSR. Method: Twenty volunteers were administered ketamine as well as a placebo on separate days in a randomized, double-blind, crossover design. We acquired resting-state functional magnetic resonance imaging (fMRI) data before, during and immediately after the acute phase of administration. Results: No differences in functional connectivity patterns were found between ketamine and placebo. These results were unaffected by the inclusion or exclusion of GSR. Conclusion: It remains unclear which changes in functional connectivity occur in the acute phase of ketamine administration. Future research should investigate the influence of GSR on fMRI findings.Show less
Research master thesis | Archaeology (research) (MA/MSc)
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Towards the end of the third millennium BC, Europe underwent significant transformations. The production of bronze would change the economic, social, and political landscape, and marked the period...Show moreTowards the end of the third millennium BC, Europe underwent significant transformations. The production of bronze would change the economic, social, and political landscape, and marked the period known as the Bronze Age. The Bronze Age witnessed the establishment of a globalized network, facilitated by extensive exchange networks. Bronze, a highly sought-after alloy made of copper and tin, played a crucial role in these developments. It became the predominant material for crafting tools, weapons, and ornaments, leading to its widespread use across Europe, even in regions far from the sources of copper and tin. The increase in trade led to theories that human mobility increased significantly during this period. Bronze Age human has been subject to many studies, which generally seem to indicate that mobility did increase, and that it was mainly females who were mobile. To investigate mobility patterns during the Bronze Age, strontium isotope analysis has proven invaluable. Although the process of cremation, which was the dominant burial method at the time, posed challenges for mobility studies, recent findings have shown that strontium isotope analysis on calcined bone can yield reliable results. This discovery has opened the door for studying mobility in cremation contexts. Despite speculation about population movement in the Netherlands during the Bronze Age based on the analysis of non-local objects, no research has been conducted in the country utilizing strontium isotope analysis to study it. For this research, strontium isotope analysis was performed on a Middle Bronze Age population from Apeldoorn-Wieselseweg. Samples of the pars petrosa, long bone, rib, and dentine were used where possible. By providing new strontium isotope data, this research hopes to gain a better understanding of human mobility during the Bronze Age in the Netherlands, and place it in a wider European context. The patterns that were observed in the results, align with the broader discussions on Bronze Age human mobility in Europe. The presence of non-local females supports the theories on female exogamy and patrilocal organisation, suggesting that these females likely migrated to the community through marriage exchange. The presence of a non-local male and child could be evidence for a fostering system. Intra-individual variation has also been observed at the site, which could be an indication of mobility. These results are similar to those from other studies on Bronze Age human mobility. However, more research is needed on Bronze Age populations in the Netherlands to gain a better understanding of the movement of people in local, and global contexts.Show less
Research master thesis | Asian Studies (research) (MA)
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This thesis is a study on how leisure industries operated under semicolonial circumstances in Republican China (specifically between 1919 and 1941). Taking place in Yantai, a medium-sized treaty...Show moreThis thesis is a study on how leisure industries operated under semicolonial circumstances in Republican China (specifically between 1919 and 1941). Taking place in Yantai, a medium-sized treaty port in China’s Shandong province, this study analyzes how leisure, in the form of sex work, was both “sought” and “provided” by different actors. This study specifically zooms in on two of these actors. Firstly, sailors of the United States Asiatic Fleet are analyzed, as this research explores how their intertwining pursuits of drinking alcohol and visiting sex workers impacted Yantai and its inhabitants. Secondly, this study delves into the lives of Yantai’s sex workers, and how their role within Yantai’s sex work industry operated during an era of semicolonial presence. This study reveals that Yantai provided sailors the opportunity to indulge themselves in vices without being judged by their surroundings in a way that they would back home. Furthermore, although their behavior was certainly not appreciated by both locals and nonlocals in Yantai, their pursuits were also tolerated by some, as they contributed to both the economic and military interests of those that interacted with them. Sex workers, on the other hand, were a demographic that underwent significant changes throughout Yantai’s Republican period, which can largely be attributed to the increasing demands for sex work by foreign sailors. Yantai’s sex work industry became notably more internationally-oriented, as shown by both international sex workers flocking to the city and the general services offered by sex workers gradually revolving more around sexual intercourse. Overall, this study reveals how demands for new forms of sex work reshaped the hierarchies of Yantai’s overall sex work industry. As a result, the industry became more asymmetrically skewed towards a foreign clientele under semicoloniality. Furthermore, Yantai’s smaller size and the relatively large number of visiting sailors made these developments more contrasting than in other cities, resulting in heavier contention, discourse and conflicts arising from these developments.Show less
Research master thesis | Archaeology (research) (MA/MSc)
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This thesis focuses on the use of experimental archaeology and residues analysis to further our understanding of the plant exploitation possibilities on the Crimean Peninsula during the Late...Show moreThis thesis focuses on the use of experimental archaeology and residues analysis to further our understanding of the plant exploitation possibilities on the Crimean Peninsula during the Late Pleniglacial period (19 -15 cal BP). Crimean plant exploitation during this period is not well understood despite palaeoenvironmental, archaeological and ethnobotanical data being available. The aim was to elicit the types of residues that would have been collected and how these residues could be made useful in archaeological applications. This was done by executing several experiments with stone tools and plants likely to have been on the peninsula during that period. The results showed interesting plant specific correlations with the tools as well as a consistent performance of starch accumulation across all tools. These results are a vital step towards creating a broader and a more inclusive reference collection for wild plants in order to understand the residues and what we need to look for in the field from an archaeological and palaeobotanical perspective.Show less
Research master thesis | Asian Studies (research) (MA)
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The thesis aims at situating "The Coconuts", one of the first Sino-Indonesian Chinese language works of fiction published in book form, by Zheng Tufei, in the history of Indonesian and Chinese...Show moreThe thesis aims at situating "The Coconuts", one of the first Sino-Indonesian Chinese language works of fiction published in book form, by Zheng Tufei, in the history of Indonesian and Chinese literature, by analyzing the main themes approached, the typologies of characters, the language and style, and the ideas promoted, in comparison with different bodies of literature (Malay, Indonesian, Sino-Malay, Sinophone, Chinese). The thesis also makes an account of all the biographical and bibliographocal data about Zheng Tufei available so far.Show less
Research master thesis | Archaeology (research) (MA/MSc)
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The human hand is a complex structure that is heavily involved in many everyday activities. As such, it can serve as a useful area for activity reconstruction in the past. Though its function and...Show moreThe human hand is a complex structure that is heavily involved in many everyday activities. As such, it can serve as a useful area for activity reconstruction in the past. Though its function and evolution have long been studied, parts of it still need to be better understood. There is evidence to suggest that the fifth ray of the hand contributes significantly to grip strength and stability in a way that has so far gone largely ignored. The aim of this study is two-fold. First, it seeks to gain a better understanding of the function and use of the fifth digit in habitual activity on the basis of three postmedieval Dutch populations. Second, it investigates habitual activity and occupation among the individuals that belonged to these communities to gain a better understanding of the lives led by people in the post-medieval Netherlands. In order to achieve those goals, the study analyses activity patterns among hand entheses through the “Validated Entheses-based Reconstruction of Activity” (VERA) method. The method is applied to 3D scans of the hand bones of 43 adult individuals. Multivariate statistics, including principal component analysis, are used for the analysis of the entheseal attachment sizes. The analysis showed that the muscles of the fifth ray are recruited in both precision and power grips in different capacities. It suggests that the fifth ray is an important supporting structure that aids in the execution of power and precision grips through its opposing position to the thumb. It is also used to provide stability by pulling it towards the other fingers. The results of this study support the assumption that the fifth ray of the hand plays a crucial role in everyday manual activity. They also suggest that a deeper understanding of its role could provide additional insights into different kinds of grasping activities in the past. The analysis further showed that the three different groups exhibit different activity patterns. The lower-class urban individuals or Arnhem exhibit a trend towards more intense power grasping, while the higher-class urban individuals from Zwolle showed a tendency for precision grasping activity. This is consistent with historical records that suggest the Zwolle individuals had worked as merchants, investors, and in similar professions, while the working poor in the city of Arnhem were probably working in factories and in the local tobacco production. The individuals from the rural community of Middenbeemster fell somewhat surprisingly in the middle of the other two groups, with a sizeable number of individuals exhibiting precision gripping patterns. This suggests that, despite this community having mainly revolved around dairy farming, individual life experiences were likely quite varied. Future analyses of the fifth ray should expand on the groundwork laid in this study by increasing the sample size, looking into individuals from different contexts and time periods, and looking into potential connections between the fifth ray and the fourth ray, wrist, and forearm.Show less
My thesis analyses the relationship between the Capuchin missionaries of the "Missio Antiqua" and the Portuguese colonial empire between the seventeenth and eighteenth century.
