Brain Topography
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Improved Selectivity in 7 T Digit Mapping Using VASO-CBV
Brain Topography - Tập 36 - Trang 23-31 - 2022
Functional magnetic resonance imaging (fMRI) at Ultra-high field (UHF, ≥ 7 T) benefits from significant gains in the BOLD contrast-to-noise ratio (CNR) and temporal signal-to-noise ratio (tSNR) compared to conventional field strengths (3 T). Although these improvements enabled researchers to study the human brain to unprecedented spatial resolution, the blood pooling effect reduces the spatial spe...... hiện toàn bộ
Advances in neuromagnetic instrumentation and studies of spontaneous brain activity
Brain Topography - Tập 2 - Trang 129-139 - 1989
Rapid progress in neuromagnetic technology has been achieved during the past two years with the introduction of a method for accurately indicating magnetic sensor locations with respect to a head-based coordinate system and the advent of refrigerator-cooled sensors and larger arrays of sensors. These make possible the real-time monitoring of evoked activity at several widely separated locations ov...... hiện toàn bộ
Theta rhythms: State of consciousness
Brain Topography - - 1990
The role of midline frontal theta in human is discussed, with reference to its relation on consciousness. Clinical observations of the appearance of this theta activity under various conditions are reviewed. These include simulated diving, brain tumour, chemical intoxication, exercise, mental calculation, sleep and meditation. The mechanism of generation of this frontal midline theta activity is d...... hiện toàn bộ
Processing of Syntactic Information Monitored by Brain Surface Current Density Mapping Based on MEG
Brain Topography - Tập 12 - Trang 75-87 - 1999
The cortical network subserving language processing is likely to exhibit a high spatial and temporal complexity. Studies using brain imaging methods, like fMRI or PET, succeeded in identifying a number of brain structures that seem to contribute to the processing of syntactic structures, while their dynamic interaction remains unclear due to the low temporal resolution of the methods. On the other...... hiện toàn bộ
Comparison of an 8-Channel and a 32-Channel Coil for High-Resolution fMRI at 7 T
Brain Topography - Tập 27 - Trang 209-212 - 2013
Multi-channel receive array rf-coils have become widely available for fMRI. The improved SNR and possibility of acquisition acceleration through parallel imaging are especially beneficial for high-resolution studies. In this study, an 8-channel and a 32-channel coil were compared in a high-resolution finger tapping fMRI experiment at 7 T. 1.3 mm3 resolution data acquired with the 32-channel coil p...... hiện toàn bộ
Accounting for Heterogeneity: Mixed-Effects Models in Resting-State EEG Data in a Sample of Tinnitus Sufferers
Brain Topography - Tập 33 - Trang 413-424 - 2020
In neuroscience, neural oscillations and other features of brain activity recorded by electroencephalography (EEG) are typically statistically assessed on the basis of the study’s population mean to identify possible blueprints for healthy subjects, or subjects with diagnosable neurological or psychiatric disorders. Despite some inter-individual similarities, there is reason to believe that a disc...... hiện toàn bộ
fMRIflows: A Consortium of Fully Automatic Univariate and Multivariate fMRI Processing Pipelines
Brain Topography - Tập 36 - Trang 172-191 - 2022
How functional magnetic resonance imaging (fMRI) data are analyzed depends on the researcher and the toolbox used. It is not uncommon that the processing pipeline is rewritten for each new dataset. Consequently, code transparency, quality control and objective analysis pipelines are important for improving reproducibility in neuroimaging studies. Toolboxes, such as Nipype and fMRIPrep, have docume...... hiện toàn bộ
Scalp Topography of the Spontaneous K-Complex and of Delta-Waves in Human Sleep
Brain Topography - Tập 15 - Trang 43-49 - 2002
Objective: Together with spindles, K-complexes are well known hallmarks of stage 2 sleep (S2). However, little is known about their topographical distribution in comparison to delta-waves and to K-complexes superimposed by spindles. Patients and methods: In this study, the topographical distribution of spontaneous K-complexes and delta-waves in S2 and delta-waves in stage 4 sleep (S4) in 10 health...... hiện toàn bộ
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