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  • 1.
    Gustavsson, Jonatan
    Umeå University, Faculty of Social Sciences, Department of Psychology.
    Alterations in resting-state amplitude associated to cognitive impairments and chronic fatigue among TBI patients2019Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Traumatic brain injury (TBI) is the most common cause of injury to the human brain and one of the most common causes of disabilities. Following a TBI, the experience can vary greatly depending on the severity of the injury. Some of the patients with mild TBI make a full recovery without any consistent symptoms or disabilities, while many of the others, including moderately-to-severely injured, will experience long-term neuro-cognitive symptoms. Out of a range of symptoms, mental fatigue is one of the most common ones reported among TBI patients. Moreover, despite fatigue being widely recognised as a serious problem shared across many neurodegenerative diseases, the underlying mechanisms are unclear. This study utilized neuropsychological data and functional resting-state data to examine possible alterations in functional connectivity between post-traumatic brain injury fatigue (PTBIF) patients and healthy controls. Resting-state data from 54 PTBIF patients and 27 controls were used to analyse different dimensions of functional connectivity by combining independent component analysis (ICA) with fractional amplitude of low-frequency fluctuation analysis (fALFF). Neuropsychological data showed that PTBIF patients were impaired performance-wise compared to controls. Seventeen resting-state networks (RSNs) were identified by the ICA. However, a multivariate analysis did not yield any significant results. Nevertheless, the fALFF analysis yielded significant differences showing decreased amplitude in RSNs essential to cognitive functioning among the PTBIF patients compared to controls. Our results showed association between decreased fALFF, cognitive impairment and self-experienced fatigue, suggesting the usage of resting-state fALFF as biomarkers for underlying physiological causes of impairments.

  • 2.
    Gustavsson, Jonatan
    Umeå University, Faculty of Social Sciences, Department of Psychology.
    The effect of task relevancy in non-consciously retained information in working memory2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The relationship between cognitive processes and consciousness has been of interest for a long time in the science community. Recent studies showed that it’s possible to non-consciously retain information in working memory.  This study aimed to replicate previous findings, and to investigate the effect of task relevancy to the retention of non-conscious information. This study used a delayed-match-to-sample task with a cue manipulating the attention, and continuous flash suppression to render the perceptual experience non-conscious on 16 participants.  Analyses showed that cue validity affected the accuracy performance and response time for items reported not seen. Implications of study design, results and theories are deliberated in the discussion.

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CiteExportLink to result list
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  • apa
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  • modern-language-association-8th-edition
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  • Other style
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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