Regular ArticleSingle-Trial Variability in Event-Related BOLD Signals
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2022, Brain ResearchCitation Excerpt :Hanakawa et al. (2008) also revealed that ME mainly activated the primary motor cortex and primary and secondary sensory cortices; MI performance mainly activated the premotor area, pre-SMA, and frontal eye fields. Although ICA has proven capable of separating neuroimaging data, such as the EEG and fMRI, into independent EEG sources and independent blood oxygenation level-dependent processes, respectively (McKeown et al., 1998; Jung et al., 2000; Duann et al., 2002), the ICA decomposition result can be widely influenced by the data variance included in the decomposition process. Therefore, decomposing the combined EEG data obtained with the three motor conditions combined may first limit the ICA decomposition to find only one independent mu component for all three motor conditions.
Noxious pressure stimulation demonstrates robust, reliable estimates of brain activity and self-reported pain
2020, NeuroImageCitation Excerpt :Reliability estimates were only slightly lower for left- and right-hand stimulation considered separately. Whilst increasing the quantity of stimuli has the potential to increase power (Huettel and McCarthy, 2001) and intersession reliability, as observed here, it can additionally introduce fluctuations in BOLD response (Duann et al., 2002) that would add variability and decrease reliability as well as contribute to habituation or sensitisation. The problem of response adaptation and habituation occurs in all sensory modalities (Thompson and Spencer, 1966), but is additionally difficult to avoid in experimental pain studies where participants are aware of the ethical responsibilities of the experimenter to ‘do no harm’ (https://www.iasp-pain.org/Education/Content.aspx?ItemNumber=1213).
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