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- Noreika, Valdas, et al.
(författare)
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Modulating dream experience : Noninvasive brain stimulation over the sensorimotor cortex reduces dream movement
- 2020
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Ingår i: Scientific Reports. - : Springer. - 2045-2322. ; 10:1
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Tidskriftsartikel (refereegranskat)abstract
- Recently, cortical correlates of specific dream contents have been reported, such as the activation of the sensorimotor cortex during dreamed hand clenching. Yet, despite a close resemblance of such activation patterns to those seen during the corresponding wakeful behaviour, the causal mechanisms underlying specific dream contents remain largely elusive. Here, we aimed to investigate the causal role of the sensorimotor cortex in generating movement and bodily sensations during REM sleep dreaming. Following bihemispheric transcranial direct current stimulation (tDCS) or sham stimulation, guided by functional mapping of the primary motor cortex, naive participants were awakened from REM sleep and responded to a questionnaire on bodily sensations in dreams. Electromyographic (EMG) and electroencephalographic (EEG) recordings were used to quantify physiological changes during the preceding REM period. We found that tDCS, compared to sham stimulation, significantly decreased reports of dream movement, especially of repetitive actions. Other types of bodily experiences, such as tactile or vestibular sensations, were not affected by tDCS, confirming the specificity of stimulation effects to movement sensations. In addition, tDCS reduced EEG interhemispheric coherence in parietal areas and affected the phasic EMG correlation between both arms. These findings show that a complex temporal reorganization of the motor network co-occurred with the reduction of dream movement, revealing a link between central and peripheral motor processes and movement sensations of the dream self. tDCS over the sensorimotor cortex interferes with dream movement during REM sleep, which is consistent with a causal contribution to dream experience and has broader implications for understanding the neural basis of self-experience in dreams. © 2020, The Author(s).
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| 2. |
- Rahman, M., et al.
(författare)
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The Ameliorating Effects Of Zingiber Zerumbet Linn On Sodium Arsenite-Induced Changes Of Blood Indices In Experimental Mice
- 2012
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Ingår i: Life Sciences and Medicine Research. - : Aston Journals. - 1948-7886. ; , s. LSMR-41-
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to evaluate the protective effect of Zingiber zerumbet Linn powder on sodium arsenite-induced changes of blood indices in experimental mice. Swiss albino male mice were divided into four groups. The first group was used as control, while the second, third and fourth groups were treated with Z. zerumbet (L.) powder, sodium arsenite and Z. zerumbet (L.) powder plus sodium arsenite, respectively. Animals (third and fourth groups) were exposed to sodium arsenite at a dose of 10 mg/kg body weight/day for 12 weeks. Exposure to sodium arsenite revealed a significant (p < 0.05) increase of serum urea, uric acid, triglyceride (TG), glucose levels and alkaline phosphatase (ALP) activity. Serum butyryl cholinesterase (BChE) activity significantly (p < 0.05) decreased in sodium arsenite-treated group as compared with control group. Interestingly, food supplemented with Z. zerumbet (L.) (50 mg/kg body weight/day) showed protective effect against sodium arsenite-induced increase of serum urea, uric acid and TG levels except serum glucose levels. Moreover, Z. zerumbet (L.) also abrogated the sodium arsenite-induced changes of BChE and ALP activities. Therefore, the ameliorating effects of Z. zerumbet (L.) on sodium arsenite-treated mice suggested the future application of Z. zerumbet (L.) to reduce or prevent arsenic toxicity in human.
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