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(PDF) Sleep, Waking and Neurobehavioural Performance

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Added on  2019-11-20

(PDF) Sleep, Waking and Neurobehavioural Performance

   Added on 2019-11-20

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To what extent is the state instability hypothesis supported by the study? The hypothesis postulates that state instability is associated with an increase in sleep driveand it leads to variable neurobehavioral performances. The research fails to support thehypothesis. The study illustrated the application of functional magnetic resonance imaging toanalyze the function of adult working memory. It attempted to show association betweenmanipulation and maintenance tasks after sleep deprivation with their response time. Theresults established link between better performances to the more complex task and alsoshowed activation of the cortical regions of the parietal, frontal and thalamic regions of thebrain. It did not utilize any parameter to depict degradation in waking state function due toattention lapses after sleep deprivation. Thus, the study failed to establish how cognitive skilldeficits accounted for an increase in performance variability. It did not illustrate the multipleneurobiological mechanisms that govern interaction between states of sleep and wakefulness.Thus, it did not support the hypothesis.To what extent is the prefrontal cortex impairment hypothesis supported?This hypothesis states that sleep deprivation creates negative effects on cognitiveperformance and alertness and this is related to brain activity and function decrease inthalamic and prefrontal cortex activity. These regions are involved high cognitive skills,alertness and attention. The study investigated the interaction between task complexities andactivation of prefrontal cortex regions in the brain. It assessed the domain of workingmemory and tried to correlate between decline in cognitive skills and physiological changesin prefrontal cortex after sleep deprivation. It focussed on task complexity in terms ofmaintenance and manipulation. This research predicted that manipulation would lead to anincrease in parietal and prefrontal activation in case of manipulation when compared tomaintenance states. Simpler tasks are generally expected to be less affected than moderately
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