Filters








154 Hits in 13.4 sec

Learning Acts on Distinct Processes for Visual Form Perception in the Human Brain

S. D. Mayhew, S. Li, Z. Kourtzi
2012 Journal of Neuroscience  
Here we take advantage of the complementary high spatial and temporal resolution of simultaneous EEG-fMRI to identify the learning-dependent changes in spatiotemporal brain patterns that mediate enhanced  ...  Similarly, we measured the choices of a pattern classifier when predicting each stimulus from EEG-fMRI signals.  ...  Figure 3 . 3 Single-trial EEG-informed fMRI analysis.  ... 
doi:10.1523/jneurosci.2033-11.2012 pmid:22262876 pmcid:PMC6621143 fatcat:uzbtbimvtner3kbnofgh556x3a

"Seeing" electroencephalogram through the skull: imaging prefrontal cortex with fast optical signal

Andrei V. Medvedev, Jana M. Kainerstorfer, Sergey V. Borisov, Amir H. Gandjbakhche, John VanMeter
2010 Journal of Biomedical Optics  
Correlation between FOS and EEG even in single trials provides further evidence that at least some FOS components "reflect" electrical brain processes directly.  ...  The data provide evidence for the early involvement of prefrontal cortex in rapid object recognition.  ...  to the blood oxygenation level dependent (BOLD) signal measured by functional magnetic resonance imaging (fMRI).  ... 
doi:10.1117/1.3505007 pmid:21198150 pmcid:PMC3003719 fatcat:c4vfwnbg2zaynehchzvs6w7jhq

Distinct visuo-motor brain dynamics for real-world objects versus planar images

Francesco Marini, Katherine A. Breeding, Jacqueline C. Snow
2019 NeuroImage  
Event-related potentials (ERPs) revealed a transient, early occipital negativity for real objects (versus images), likely reflecting 3-D stereoscopic differences, and a late sustained parietal amplitude  ...  Ultimately, we aim to generalize and translate scientific knowledge to the real world, yet current understanding of human visual perception is based predominantly on studies of two-dimensional (2-D) images  ...  .); the National Eye Institute of the National Institutes of Health (grant number R01EY026701 to J.C.S.); and the National Institute of General Medical Sciences of the National Institutes of Health (grant  ... 
doi:10.1016/j.neuroimage.2019.02.026 pmid:30776529 pmcid:PMC6536332 fatcat:w6anizvf6fg6rojqpmu2izw2lu

Neural Mechanisms of Rapid Sensitivity to Syntactic Anomaly

Albert E. Kim, Phillip M. Gilley
2013 Frontiers in Psychology  
Independent components analysis revealed three sources within the ERP signal whose functional dynamics were consistent with predictive processing and early responses to syntactic anomaly.  ...  Distributed neural source modeling (sLORETA) of these early active sources produced a candidate network for early responses to words during reading in the right posterior occipital, left occipital-temporal  ...  Concurrent effects of lexical status and letter-rotation during early stage visual word recognition: evidence from ERPs. Brain Res. 1468, 52-62. Kuperberg, G. R., Holcomb, P.  ... 
doi:10.3389/fpsyg.2013.00045 pmid:23515395 pmcid:PMC3600774 fatcat:rxr574a6ercnrdhfy5a74od54m

Electrophysiological Events Related to Top-Down Contrast Sensitivity Control

BV Misic, BA Schneider, S de la Rosa, C Alain, AR McIntosh
2009 NeuroImage  
of the members of the McIntosh Lab and the Rotman Research Institute ERP Lab for providing a stimulating environment.  ...  Finally, I would like to thank the University of Toronto Department of Psychology and the Government of Canada for their financial support during my studies.  ...  In these studies, the 'response' variable is the hemodynamic or blood-oxygen-level dependent (BOLD) signal that depends on the activity of many neurons.  ... 
doi:10.1016/s1053-8119(09)70033-3 fatcat:u3ntbnbtb5elpjyf6q5tmmfi2y

Modeling & Analysis

2003 NeuroImage  
Abstract [Background] We have advocated the use of 3D virtual reality Talairach modeling (VRTM) for topographic mapping of EEG/ERP activation and tomographic registration of PET/fMRI responses based on  ...  Huettel et. al. showed that the second face in a pair of identical faces presented 6s apart elicited a BOLD signal that was only about 70% of the magnitude obtained from individual faces presented at ISI  ...  In this small group of patients the temporal distribution of EEG events did not appear to be the main determinant of significant BOLD responses.  ... 
doi:10.1016/s1053-8119(05)70006-9 fatcat:zff2suxcofbxvetfrwfwcxi3zm

Early ERPs to faces: aging, luminance, and individual differences

Magdalena M. Bieniek, Luisa S. Frei, Guillaume A. Rousselet
2013 Frontiers in Psychology  
Overall, our results strongly suggest that early ERPs to faces (<200 ms) are delayed by aging and that these delays are of cortical, rather than optical origin.  ...  Our results also demonstrate that even late ERPs to faces are modulated by low-level factors.  ...  Lesley Mackay and Christina Xanthi Moustaka were supported by a summer scholarship from the University of Glasgow Settlement charity.  ... 
doi:10.3389/fpsyg.2013.00268 pmid:23717297 pmcid:PMC3653118 fatcat:pukkj2i4xfbd7dk3tubplmncpu

Physiological basis and image processing in functional magnetic resonance imaging: neuronal and motor activity in brain

Rakesh Sharma, Avdhesh Sharma
2004 BioMedical Engineering OnLine   retracted
Functional magnetic resonance imaging (fMRI) is recently developing as imaging modality used for mapping hemodynamics of neuronal and motor event related tissue blood oxygen level dependence (BOLD) in  ...  This review article summarizes the physiological basis of fMRI signal, its origin, contrast enhancement, physical factors, anatomical labeling by segmentation, registration approaches with examples of  ...  A solid line indicates a mean signal change across ten trials shown as dots. The transient signal change timelocked to EMG offset was observable even in single trial (see panel B).  ... 
doi:10.1186/1475-925x-3-13 pmid:15125779 pmcid:PMC419711 fatcat:dcn2cgkgyrfspboticb2qyswmy

Recovery of stereopsis in human adults with strabismus through perceptual learning

J. Ding, D. Levi
2010 Journal of Vision  
Locations of 1st and 2nd order objects are represented in the same way but at different times, as revealed by single-trial decoding of EEG signals R Chakravarthi 1 , T Carlson 2 , J Chaffin 1 , J Turret  ...  Here, we simultaneously recorded eye-movements and electroencephalographic (EEG) signals of Westerners and Easterners during face identification of learnt identities.  ...  The resulting shape depends on the phase relationship between the two components and was either in-phase (one peak of each component aligned), out-of-phase (one peak and trough aligned) or intermediate  ... 
doi:10.1167/10.7.1124 fatcat:w3a4vu2hybhcvjwfqrryzzilbi

Temporo-frontal phase synchronization supports hierarchical network for mismatch negativity

Shannon E. MacLean, Lawrence M. Ward
2014 Clinical Neurophysiology  
I remain deeply indebted to Lawrence Ward, my supervisor, for his wisdom, compassion, generosity, and patience. As well, for their guidance and generous donation of their time, I am  ...  ACKNOWLEDGEMENTS This work was generously supported by NSERC: a Discovery Grant awarded to Lawrence Ward and a Post Graduate Scholarship Doctoral awarded to Shannon MacLean.  ...  Combining EEG/MEG and fMRI to reveal the spatiotemporal character of neural sources is one approach that has been untaken to address the limitations inherent in each technique alone; however, the assumption  ... 
doi:10.1016/j.clinph.2013.12.109 pmid:24508191 fatcat:dk4nlpjtubgibnyu3ljgpa6ixq

Abstracts of the 16th Annual Meeting of The Israel Society for Neuroscience: Eilat, Israel, November 25–27, 2007

2007 Neural Plasticity  
poster presentations, and the program of the meeting is mainly based on the 338 received abstracts which are published in this volume.  ...  Since then, the society holds its annual meeting every year in Eilat usually during December.  ...  The effects of music background on sleep efficiency, anxiety and depression in Schizophrenia patients  ... 
doi:10.1155/2007/30585 pmid:25148070 pmcid:PMC2366074 fatcat:u4tjfw6shnaxpnzwezieeiqnpm

Crowding is similar for eye movements and manual responses

F. Yildirim, F. W. Cornelissen
2014 Journal of Vision  
Women with premenstrual syndrome (PMS) symptoms, compared to non-symptomatic controls both on or off monophasic oral contraceptives, show asymmetric horizontal smooth pursuit amplitudes during their late  ...  global confidence across multiple trials of a visual task Alan L F Lee, Vincent de Gardelle, Pascal Mamassian 43.531 Action Encoding and Recognition based on Multi-Scale Spatial-Temporal Natural Action  ... 
doi:10.1167/14.10.789 fatcat:uxwzbzfhbjc3ddyfhbs2ilr4qe

Abstracts Presented at the Thirty–Fourth Annual International Neuropsychological Society Conference, February 1–4, 2006, Boston, Massachussetts, USA

2006 Journal of the International Neuropsychological Society  
With the exception of CVLT-II recognition, SCZ and PMI groups did not significantly differ on neuropsychological test performance.  ...  Participants underwent fMRI during the Arrows inhibition task.  ...  In this context, it is crucial that valid and reliable approaches for evaluating BOLD signals during fMRI studies are established.  ... 
doi:10.1017/s1355617706069918 fatcat:cy3cbwlgrvccfnn6w7inplceni

Abstracts Presented at the International Neuropsychological Society, the Swiss Neuropshchological Society (SVNP), and the German Neuropsychological Society (GNP) Meeting, July 26–30, 2006, Zurich, Switzerland

2006 Journal of the International Neuropsychological Society  
4 group exhibited both a increase in the extent of the cortex activated during recall and a larger BOLD signal amplitude.  ...  The lower HHb level will lead to a general increase in the BOLD signal amplitude.  ...  Functional MRI uses the blood oxygenation dependent (BOLD) signal as an internal contrast agent.  ... 
doi:10.1017/s1355617706069955 fatcat:weo5fxgnqja2tlehcvrqmenrqe

Abstracts of the 20th European Conference on Eye Movements, 18-22 August 2019, in Alicante (Spain)

Susana Martinez-Conde, Luis Martinez-Otero, Albert Compte, Rudolf Groner
2019 Journal of Eye Movement Research  
This document contains all abstracts of the 20th European Conference on Eye Movements, August 18-22, 2019, in Alicante, Spain Video stream "Glimpses at 20th ECEM": https://vimeo.com/user43478756.  ...  Reward was calculated as a fraction of the maximum depending on the performance (accuracy and speed).  ...  Results: We observed improved performance on incentivized trials (more so for reward than penalty) looking at peak velocity and reaction times.  ... 
doi:10.16910/jemr.12.7.1 pmid:33828763 pmcid:PMC7917478 fatcat:wqzwn552cndsnablyikzx3og5e
« Previous Showing results 1 — 15 out of 154 results