Neuroimage
January 17, 2008
Andrew C.N. Chen, Weijia Feng, Huixuan Zhao et al.
261 citations
Eyes-closed (EC) and eyes-open (EO) are essential behaviors in mammalians, including man. At resting EC-EO state, brain activity in the default mode devoid of task-demand has recently been established in fMRI. However, the corresponding comprehensive electrophysiological conditions are little known even though EEG has been recorded in humans for nearly 80 years. In this study, we examined the...
International Journal of Psychophysiology
July 13, 2007
René Scheeringa, Marcel C.M. Bastiaansen, Karl Magnus Petersson et al.
415 citations
We used simultaneously recorded EEG and fMRI to investigate in which areas the BOLD signal correlates with frontal theta power changes, while subjects were quietly lying resting in the scanner with their eyes open. To obtain a reliable estimate of frontal theta power we applied ICA on band-pass filtered (2-9 Hz) EEG data. For each subject we selected the component that best matched the...
Shang Zhang, Haoyu Li, Junyao Wang et al.
preprint
Background: Mild cognitive impairment (MCI) is a critical stage in the Alzheimer's disease continuum, yet accessible biomarkers reflecting both peripheral pathology and central network dysfunction are insufficient. This study investigated whether default mode network (DMN) functional connectivity correlates with plasma phosphorylated tau 217 (p-Tau217) in MCI patients.Methods: Thirty‑two MCI...
Charlotte Murphy, Elizabeth Jefferies, Shirley-Ann Rueschemeyer et al.
preprint
Abstract: The default mode network supports a variety of mental operations such as semantic processing, episodic memory retrieval, mental time travel and mind-wandering, yet the commonalities between these functions remains unclear. One possibility is that this system supports cognition that is independent of the immediate environment; alternatively or additionally, it might support...
Christiane Oedekoven, James L. Keidel, Stuart Anderson et al.
preprint
Despite their severely impaired episodic memory, individuals with amnesia are able to comprehend ongoing events. Online representations of a current event are thought to be supported by a network of regions centred on the posterior midline cortex (PMC). By contrast, episodic memory is widely believed to be supported by interactions between the hippocampus and these cortical regions. In this MRI...
Hannes Almgren, Frederik van de Steen, Simone Kühn et al.
preprint
Abstract: Dynamic causal modelling (DCM) for resting state fMRI – namely spectral DCM – is a recently developed and widely adopted method for inferring effective connectivity in intrinsic brain networks. Most research applying spectral DCM has focused on group-averaged connectivity within large-scale intrinsic brain networks; however, the consistency of subject- and session-specific estimates...
Yang Hu, Jijun Wang, Chunbo Li et al.
preprint
Abstract: A brain network consisting of two key parietal nodes, the precuneus and the posterior cingulate cortex, has emerged from recent fMRI studies. Though it is anatomically adjacent to and spatially overlaps with the default mode network (DMN), its function has been associated with memory processing, and it has been referred to as the parietal memory network (PMN). Independent component...
Parnesh Raniga, Bryan Paton, Gary F. Egan
preprint
Abstract: In order to better understand dysfunction in dementia and psychiatric illnesses, the underlying neuronal systems that give rise to normal memory and cognitive processes need to be better understood. Based on electrophysiological recordings in animals, theta oscillations have been proposed as an intrinsic mechanism for the orchestration of memory functions, especially episodic and...
Jun Miyata, Akihiko Sasamoto, Takahiro Ezaki et al.
preprint
Abstract: Background and hypothesis: While the conservatism bias refers to the human need for more evidence for decision-making than rational thinking expects, people with schizophrenia and delusion require less evidence, known as the jumping to conclusions (JTC) bias. The midbrain-striatal aberrant salience of schizophrenia is postulated to form delusion; however, the association between...
Ben J. Harrison, Christopher G. Davey, Hannah S. Savage et al.
preprint
Abstract: The brain’s ‘default mode network’ (DMN) enables flexible switching between internally and externally focused cognition. Precisely how this modulation occurs is not well understood, although may involve key subcortical mechanisms, including hypothesized influences from the basal forebrain (BF) and mediodorsal thalamus (MD). Here, we used ultra-high field (7T) functional magnetic...