3,249 Hits in 6.0 sec

Integration of Simultaneous Resting-State EEG, fMRI, and Eye Tracker Methods to Determine and Verify EEG Vigilance Measure [article]

Ahmad Mayeli, Obada Al Zoubi, Masaya Misaki, Jennifer L. Stewart, Vadim Zotev, Qingfei Luo, Raquel Phillips, Stefan Fischer, Marcus Goetz, Martin P. Paulus, Hazem Refai, Jerzy Bodurka
2019 arXiv   pre-print
Moreover, FOBP also correlated with heart rate (r=0.255, p<0.001), as well as several brain regions in the anti-correlated network, including the bilateral insula and inferior parietal lobule.  ...  Concurrent electroencephalography and fMRI (EEG-fMRI) measurements are also widely used to study human brain with high spatial/temporal resolution.  ...  Figure 4 : 4 Association between frontal and occipital beta power (FOBP) and heart rate. The correlations between FOBP and heart rate are shown for each run and each subject.  ... 
arXiv:1912.04975v1 fatcat:gsrzkldtxjdhle4upimfavswdy

Categorized EEG Neurofeedback Performance Unveils Simultaneous fMRI Deep Brain Activation [chapter]

Sivan Kinreich, Ilana Podlipsky, Nathan Intrator, Talma Hendler
2012 Lecture Notes in Computer Science  
Comparing the two groups along with their parasympathetic Heart-Rate reactivity profile verified the relaxed state of the responders.  ...  Projection of responders variations in the T/A power to the fMRI whole brain maps revealed networks of correlated and inversely correlated activity reflecting induced relaxation, uniquely among responders  ...  Fourier transform of the heart rate reveals common high and low frequency peaks of the power spectrum.  ... 
doi:10.1007/978-3-642-34713-9_14 fatcat:i2ekfmqi4nckhiighysxjegjfy

An orderly sequence of autonomic and neural events at transient arousal changes [article]

Yameng Gu, Feng Han, LUCAS EUGENE SAINBURG, Margeaux M Schade, Orfeu M Buxton, Jeff H Duyn, Xiao Liu
2022 bioRxiv   pre-print
The temporal relationship between the various signals indicated combined neural and autonomic contribution to the fMRI signal, both of which involve widespread brain areas.  ...  To investigate this potential co-variation, we performed rsfMRI experiments while concurrently acquiring electroencephalography and autonomic indicator signals, including heart rate, respiratory depth,  ...  Thomas Beck and Dr. Josef Pfeuffer, Siemens AG, Healthcare Sector for providing us with the Advanced fMRI package WIP package. We would also like to thank Dr. Xiaoxiao Bai, Jack W.  ... 
doi:10.1101/2022.02.05.479238 fatcat:jnwrfvesfjdqpl25dvyaizyum4

Content-Free Awareness: EEG-fcMRI Correlates of Consciousness as Such in an Expert Meditator

Ulf Winter, Pierre LeVan, Tilmann L. Borghardt, Burak Akin, Marc Wittmann, Yeshe Leyens, Stefan Schmidt
2020 Frontiers in Psychology  
The neural correlates of CFA were characterized by a sharp decrease in alpha power and an increase in theta power as well as increases in functional connectivity in the DAN and decreases in the posterior  ...  The combination of high-resolution EEG and ultrafast fMRI enabled us to analyze the dynamic aspects of fMRI connectivity informed by EEG power analysis.  ...  We also expected increases in theta and alpha power and signs of deep relaxation in the heart-rate and breathing data.  ... 
doi:10.3389/fpsyg.2019.03064 pmid:32132942 pmcid:PMC7040185 fatcat:h4faa3kfpfepvc33fc35qvwhym

Multimodal Imaging of Dynamic Functional Connectivity

Enzo Tagliazucchi, Helmut Laufs
2015 Frontiers in Neurology  
Compared to MEG and EEG, fMRI has a relatively slow temporal sampling rate. With one measurement every 2 s (a typical value) a 10 min session would yield 300 data points.  ...  However, the indirect nature of fMRI measurements can hinder the interpretability of the results.  ...  No correlations were found between dynamic functional connectivity and fluctuations in heart rate/respiration/head motion (27) .  ... 
doi:10.3389/fneur.2015.00010 pmid:25762977 pmcid:PMC4329798 fatcat:g4babx4u2vautdvevlwomtwyku

Mapping the functional brain state of a world champion freediver in static dry apnea

Jitka Annen, Rajanikant Panda, Charlotte Martial, Andrea Piarulli, Guillaume Nery, Leandro R. D. Sanz, Juan M. Valdivia-Valdivia, Didier Ledoux, Olivia Gosseries, Steven Laureys
2021 Brain Structure and Function  
Compared to resting state at baseline, breath holding was characterized by increased EEG power and functional connectivity in the alpha band, along with decreased delta band connectivity. fMRI connectivity  ...  We evaluated the psychological and physiological adaptation and the functional cerebral changes using electroencephalography (EEG) and functional Magnetic Resonance Imaging (fMRI) to 6.5 min of dry static  ...  Spectral power in the delta (1-4 Hz), theta (4.1-8 Hz), alpha (8.1-13 Hz), beta (13.1-20 Hz) and gamma (20-45 Hz, (Steriade 2006 )) bands were estimated for bins of 0.5 Hz between 0.5 and 30 Hz, for each  ... 
doi:10.1007/s00429-021-02361-1 pmid:34420066 fatcat:6x6u4rekuzblhdjrgda6illjiy

Hemodynamic Correlates of Electrophysiological Activity in the Default Mode Network

Marco Marino, Giorgio Arcara, Camillo Porcaro, Dante Mantini
2019 Frontiers in Neuroscience  
We first detected the DMN from source reconstructed hdEEG data for multiple frequency bands, and we then mapped the correlation between temporal profile of hdEEG-derived DMN activity and fMRI-BOLD signals  ...  We suggest that simultaneous EEG-fMRI may represent a powerful tool to investigate the neurophysiological basis of human brain networks.  ...  ACKNOWLEDGMENTS The authors would like to thank Quanying Liu for assistance with the data collection.  ... 
doi:10.3389/fnins.2019.01060 pmid:31636535 pmcid:PMC6788217 fatcat:v3ate65mobdljgmwkgtzivjk5q

The neuronal associations of respiratory-volume variability in the resting state [article]

Sayedmohammad Shams, Pierre LeVan, Jean Chen
2020 bioRxiv   pre-print
The lag between RVT and EEG is consistent with previously reported values. However, an interesting finding is related to the polarity of the correlation between RVT and EEG.  ...  We hypothesize that (1) there is a significant relationship between EEG and RVT in multiple EEG bands, and (2) that this relationship varies by brain region.  ...  Acknowledgments This research is funded by the Canadian Institutes of Health Research (CIHR) and the Sandra Rotman Foundation. References  ... 
doi:10.1101/2020.10.01.322800 fatcat:e6syh2f2sjfkrjpb6zbpi4dwq4

Fear conditioning prompts sparser representations of conditioned threat in primary visual cortex

Siyang Yin, Ke Bo, Yuelu Liu, Nina Thigpen, Andreas Keil, Mingzhou Ding
2020 Social Cognitive and Affective Neuroscience  
Across acquisition trials, the rate of change in CS+-related alpha desynchronization was correlated with the rate of change in multivoxel pattern representations of CS+.  ...  In habituation, which preceded acquisition, and in extinction, the same two gratings were presented without US.  ...  Acknowledgements This work was supported by NIH grants R01MH097320 and R01 MH112558. Declaration of Interest The authors declare no conflicts of interest.  ... 
doi:10.1093/scan/nsaa122 pmid:32901822 pmcid:PMC7647380 fatcat:amo6v7bh4jgpbek2y3ywyin5ze

Fear conditioning prompts sparser representations of conditioned threat in primary visual cortex [article]

Siyang Yin, Ke Bo, Yuelu Liu, Nina Thigpen, Andreas Keil, Mingzhou Ding
2020 bioRxiv   pre-print
Across acquisition trials, the rate of change in CS+-related alpha desynchronization was correlated with the rate of change in multivoxel pattern representations of the CS+.  ...  In habituation, which preceded acquisition, and in final extinction, the same two gratings were presented without the US.  ...  The copyright holder for this preprint (which was not peer-reviewed) is the . doi: bioRxiv preprint  ... 
doi:10.1101/2020.01.16.909085 fatcat:etenw3hwgzcktimqfh5mqdfxra

The amplitude of the resting-state fMRI global signal is related to EEG vigilance measures

Chi Wah Wong, Valur Olafsson, Omer Tal, Thomas T. Liu
2013 NeuroImage  
In this study, we used simultaneously acquired fMRI and electroencephalographic (EEG) measures of resting-state activity to assess the relation between the fMRI global signal and EEG measures of vigilance  ...  between the default mode network and the task-positive network.  ...  In particular, we consider EEG measures of vigilance, defined as the ratio between power in the alpha band to the power in the delta and theta bands (Horovitz et al., 2008; Olbrich et al., 2009) .  ... 
doi:10.1016/j.neuroimage.2013.07.057 pmid:23899724 pmcid:PMC3815994 fatcat:yuhwhz63gzha7cgdjysbtfxjly

Reduced fMRI activity in response to salient stimuli in first-episode schizophrenia

K Brown, D Alexander, P Boord, P Das, G Flynn, C Galletly, E Gordon, A Harris, TJ Whitford, W Wong, L Williams
2006 Acta Neuropsychiatrica  
In this age group, heart rate and EEG power had a positive correlation across all frequency bands (delta, theta, alpha, beta r = +0.25, +0.20, +0.14, +0.19, respectively; n = 675, P < 0.001).  ...  EEG power was calculated in standard frequency bands, averaged across sites and correlated with average heart rate for each decade of the life span.  ...  In this age group, heart rate and EEG power had a positive correlation across all frequency bands (delta, theta, alpha, beta r = +0.25, +0.20, +0.14, +0.19, respectively; n = 675, P < 0.001).  ... 
doi:10.1017/s0924270800031008 pmid:27397258 fatcat:agy3povxcncgfabfoexfpliswq

Variations in the frequency and amplitude of resting-state EEG and fMRI signals in normal adults: The effects of age and sex [article]

Xiaole Zachary Zhong, Jean Chen
2020 bioRxiv   pre-print
We also found that the fMRI-EEG power ratio is higher in young adults than old adults. However, the mediation analysis shows the association between EEG and fMRI parameters in aging is negligible.  ...  This is the first study that examines both power and frequency of both resting EEG and fMRI signals in the same cohort.  ...  Acknowledgments The authors acknowledge funding support from the Canadian Institutes of Health Research (CIHR) and the Natural Sciences and Engineering Research Council of Canada (NSERC).  ... 
doi:10.1101/2020.10.02.323840 fatcat:y6yauwudtjgejgwwopwq46nluu

EEG Alpha Power Modulation of fMRI Resting-State Connectivity

René Scheeringa, Karl Magnus Petersson, Andreas Kleinschmidt, Ole Jensen, Marcel C.M. Bastiaansen
2012 Brain Connectivity  
The results show that when alpha power increases, BOLD connectivity between the primary visual cortex and occipital brain regions decreases and that the negative relation of the visual cortex with the  ...  Here we use simultaneously recorded EEG and fMRI to assess whether fMRI-based connectivity and frequency-specific EEG power are related.  ...  Acknowledgments We would like to thank Lennart Verhagen for helpful discussions and contributions to the analyses.  ... 
doi:10.1089/brain.2012.0088 pmid:22938826 pmcid:PMC3621304 fatcat:qnjqn63eebdrleugnf2ylcou4i

EEG-correlated fMRI of human alpha activity

H Laufs, A Kleinschmidt, A Beyerle, E Eger, A Salek-Haddadi, C Preibisch, K Krakow
2003 NeuroImage  
Here, we implemented continuous and simultaneous EEG/fMRI to identify BOLD signal changes related to spontaneous power fluctuations in the alpha rhythm (8 -12 Hz), the dominant EEG pattern during relaxed  ...  The relevance of these findings is discussed in view of the current theories on the generation and significance of the alpha rhythm and the related functional neuroimaging findings.  ...  ., and A.K. were funded by the Volkswagen Stiftung and K.K. by the Medical Faculty of the Johann Wolfgang Goethe-University, Frankfurt.  ... 
doi:10.1016/s1053-8119(03)00286-6 pmid:12948703 fatcat:uuxw2hnojnhxpdpuno2wrbh5ke
« Previous Showing results 1 — 15 out of 3,249 results