Research Topics
| A A IoannidesSummaryAffiliation: RIKEN Brain Science Institute Country: Japan Publications
| Collaborators
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Detail Information
Publications
Timing and connectivity in the human somatosensory cortex from single trial mass electrical activityAndreas A Ioannides
Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, 2 1 Hirosama, Wako Shi, Saitama 351 0198, Japan
Hum Brain Mapp 15:231-46. 2002..We observe in one set of trials sequential activation from SI to SII and insula with onset of SII at 60 msec, whereas in the other set simultaneous early co-activations of the same two areas...
MEG identifies dorsal medial brain activations during sleepAndreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Wakoshi, Saitama, 351 0198, Japan
Neuroimage 44:455-68. 2009....- Magnetoencephalography (MEG)Andreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Saitama, Japan
Methods Mol Biol 489:167-88. 2009..The estimates of brain activity derived from MEG can therefore be used to study mechanisms and processes that support normal brain function in humans and help us understand why, when and how they fail... - Attention modulates earliest responses in the primary auditory and visual corticesVahe Poghosyan
Laboratory for Human Brain Dynamics, AAI Scientific Cultural Services Ltd, Office 501, Galaxias Building Block A, 33 Arch Makarios III Avenue, 1065 Nicosia, Cyprus
Neuron 58:802-13. 2008..Furthermore, we reproduced our findings using ECD modeling guided by the results of distributed source analysis and suggest a reason why earlier studies using ECD analysis failed to identify the modulation of earliest V1 activity... - Stimulus-contrast-induced biases in activation order reveal interaction between V1/V2 and human MT+Masaki Maruyama
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, 2 1 Hirosawa, Wakoshi, Saitama 351 0198, Japan
Hum Brain Mapp 30:147-62. 2009..The results also suggest that feedback from hMT+ for low-contrast stimuli compensates for unresolved processing in V1/V2 when the input of a visual image is weak... - Coupling of regional activations in a human brain during an object and face affect recognition taskA A Ioannides
Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako Shi, Saitama, Japan
Hum Brain Mapp 11:77-92. 2000.... - Imaging cerebellum activity in real time with magnetoencephalographic dataAndreas A Ioannides
Laboratory for Human Brain Dynamics, Brain Science Institute BSI, RIKEN, 2 1 Hirosawa, Wako Shi, Saitama, 351 0198, Japan
Prog Brain Res 148:139-50. 2005..The ability of MFT to identify cerebellar, brainstem and cortical activations in real time can add new insights about dynamics of brain activity to the recent findings about cerebellar function from PET and fMRI... - Real-time neural activity and connectivity in healthy individuals and schizophrenia patientsAndreas A Ioannides
Laboratory for Human Brain Dynamics, BSI, RIKEN, 2 1 Hirosawa, Wako Shi, Saitama, 351 0198, Japan
Neuroimage 23:473-82. 2004..In schizophrenic subjects, no such well-defined stages of processing were observed. Instead, the activations, although strong were poorly linked to each other, managing only isolated links between pairs of areas... - MEG tomography of human cortex and brainstem activity in waking and REM sleep saccadesAndreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, 2 1 Hirosawa, Wako Shi, Saitama 351 0198, Japan
Cereb Cortex 14:56-72. 2004..An orbitofrontal-amygdalo-parahippocampal-pontine sequence, possibly related to emotional activation during REM sleep, was identified in the last 100 ms leading to the REM saccade, but not linked to saccade initiation... - Single-trial variability in early visual neuromagnetic responses: an explorative study based on the regional activation contributing to the N70m peakN A Laskaris
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, Wako Shi, Saitama 351 0198, Japan
Neuroimage 20:765-83. 2003..Our results suggest a state-dependent response with a wide range of characteristic time scales and indicate the ongoing activity as a marker of the responsiveness state... - Magnetoencephalographic evidence of the interhemispheric asymmetry in echoic memory lifetime and its dependence on handedness and genderAndreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, 2 1 Hirosawa, Wako Shi, Saitama, 351 0198, Japan
Neuroimage 19:1061-75. 2003..The identified multiple neural delay lines and their laterality may provide a link between macroneuronal activity and left hemisphere specialization for processing linguistic material... - Real time human brain function: observations and inferences from single trial analysis of magnetoencephalographic signalsA A Ioannides
Laboratory for Human Brain Dynamics, Brain Science Institute BSI, RIKEN, 2 1 Hirosawa, Wako Shi, Saitama, 351 0198, Japan
Clin Electroencephalogr 32:98-111. 2001..Some new, but not all that unexpected, findings also emerge from the analysis... - Real time processing of affective and cognitive stimuli in the human brain extracted from MEG signalsA A Ioannides
Lab for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako Shi, Saitama, Japan
Brain Topogr 13:11-9. 2000..The last step produced statistically significant increases in occipital and inferior ventral cortex between 100 and 200 ms compared to a prestimulus baseline... - Consistent and precise localization of brain activity in human primary visual cortex by MEG and fMRIF Moradi
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute (BSI, Wako-shi, Saitama 351-0198, Japan
Neuroimage 18:595-609. 2003..The beginning of the next wave of activations (M70) was also marked by a brief V1 activation, mainly between 50 and 60 ms. The mean separation between V1 activation centers identified by fMRI and the earliest MEG activation was 3-5 mm... - Dynamics of brain activity in motor and frontal cortical areas during music listening: a magnetoencephalographic studyMihai Popescu
Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako, Saitama 351-0198, Japan
Neuroimage 21:1622-38. 2004..These correlations showed distinct laterality depending on how the musical performance deviated from the strict tempo of the music score, that is, depending on the musical expression... - Neural correlates of priming on occluded figure interpretation in human fusiform cortexL C Liu
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, 2 1 Hirosawa, Wakoshi, Saitama 351 0198, Japan
Neuroscience 141:1585-97. 2006.... - Contribution of the human superior parietal lobule to spatial selection process: an MEG studyT Shibata
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, 2 1 Hirosawa, Wako Shi, 351 0198, Saitama, Japan
Brain Res 897:164-8. 2001..Our results suggest that the human SPL plays a role in the spatial selection in a visuomotor task similar to that identified recently in monkeys... - The human primary somatosensory cortex response contains components related to stimulus frequency and perception in a frequency discrimination taskL C Liu
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, 2 1 Hirosawa, Wako Shi, Saitama 351 0198, Japan
Neuroscience 121:141-54. 2003..Our results suggest that SI is involved with the analysis of an input frequency and related to perception and decision at different latencies... - Early (N70m) neuromagnetic signal topography and striate and extrastriate generators following pattern onset quadrant stimulationA Tzelepi
Laboratory for Human Brain Dynamics, RIKEN, Wako-shi, 351-01, Japan
Neuroimage 13:702-18. 2001..Extrastriate generators in V5 and the human homologue of V6, which were variable across run repetitions at N70m, settled to highly reproducible activations between 100 and 200 ms... - Exploratory data analysis of evoked response single trials based on minimal spanning treeN A Laskaris
Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako-shi 351-01, Japan
Clin Neurophysiol 112:698-712. 2001.... - Spatiotemporal dynamics and connectivity pattern differences between centrally and peripherally presented facesLichan Liu
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute (BSI, 2-1 Hirosawa, Wakoshi, Saitama, 351-0198, Japan
Neuroimage 31:1726-40. 2006.... 
Wired for her face? Male attentional bias for female facesYuka Okazaki
Brain Science Institute, Wako Shi, Saitama, Japan
Brain Topogr 23:14-26. 2010..These results suggest that within the male brain, female face stimuli are more resilient to suppression than male faces, once attention is drawn to the part of the visual field where the face appears...- Semantic geodesic maps: a unifying geometrical approach for studying the structure and dynamics of single trial evoked responsesN A Laskaris
Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako-shi 351-0198, Japan
Clin Neurophysiol 113:1209-26. 2002..Finally our results provide evidence for interhemispheric binding in the (4-8 Hz) range and dynamical coupling at faster time scales... - Functional specialization and dynamic resource allocation in visual cortexGijs Plomp
Brain Science Institute, RIKEN, Wako Shi, Japan
Hum Brain Mapp 31:1-13. 2010..The contrasting stimulus-evoked effects in the right and left FG show that the former area is sensitive to task demands irrespective of stimulus content, whereas the left FG is sensitive to stimulus content irrespectively of task demand... - Modulus and direction of the neural current vector identify distinct functional connectivity modes between human MT+ areasMasaki Maruyama
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, 2 1 Hirosawa, Wakoshi, Saitama 351 0198, Japan
J Neurosci Methods 192:34-48. 2010..The temporal patterns of modulus and directional connectivity were different at low contrast, but similar to those at high contrast. We conclude that the modulus and direction indicate distinct functional connectivity modes... - Localization of individual area neuronal activityN Hironaga
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, Wako Shi, Saitama 351 0198, Japan
Neuroimage 34:1519-34. 2007..We show that LIANA provides almost identical results with each ICA method despite the fact that each method yields different individual components... - Widely distributed magnetoencephalography spikes related to the planning and execution of human saccadesAndreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Wakoshi, Saitama 351 0198, Japan
J Neurosci 25:7950-67. 2005..Cues providing partial information initiated competing motor programs for as yet undecided future actions that were maintained until cues with new information resolved the uncertainty... - MEG study of short-term plasticity following multiple digit frequency discrimination training in humansLichan Liu
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, 2 1 Hirosawa, Wakoshi, Saitama, Japan
Brain Topogr 16:239-43. 2004..Our results suggest that short-term plasticity is associated with changes in timing and interaction between cortical areas... - Dynamic functional connectivityAndreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, 2 1 Hirosawa, Wakoshi, Saitama, Japan 351 0198
Curr Opin Neurobiol 17:161-70. 2007..As shown at the end of this review, a correspondence principle can be formulated to guide the interpretation across network levels and to relate nodes to well defined anatomical entities... - Brain activation sequences following electrical limb stimulation of normal and paraplegic subjectsAndreas A Ioannides
Laboratory for Human Brain Dynamics, Brain Science Institute (BSI, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
Neuroimage 16:115-29. 2002.... - Effects of attention and arousal on early responses in striate cortexVahe Poghosyan
Laboratory for Human Brain Dynamics, BSI, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan
Eur J Neurosci 22:225-34. 2005..Even before the striate cortex, activity of the right inferior parietal lobule was modulated by attention, suggesting this region as a candidate for mediating attentional signals to the striate cortex... - The "mosaic stage" in amodal completion as characterized by magnetoencephalography responsesGijs Plomp
RIKEN Brain Science Institute (BSI, Saitama, Japan
J Cogn Neurosci 18:1394-405. 2006.... - Magnetoencephalography as a research tool in neuroscience: state of the artAndreas A Ioannides
Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Saitama, Japan
Neuroscientist 12:524-44. 2006..In this view, normal brain function is seen as a cascade of extremely fast events and the unfolding of specialized processes, segregated in space and time and organized into well-defined stages of processing... - MEG's ability to localise accurately weak transient neural sourcesChristos Papadelis
Laboratory for Human Brain Dynamics, Brain Science Institute BSI, RIKEN, 2 1 Hirosawa, Wako Shi, Saitama 351 0198, Japan
Clin Neurophysiol 120:1958-70. 2009..To investigate the accurate localisation of weak, transient, neural sources under conditions of varying difficulty... - Precise mapping of early visual responses in space and timeVahe Poghosyan
Laboratory for Human Brain Dynamics, BSI, RIKEN, 2 1 Hirosawa, Wako Shi, Saitama, 351 0198, Japan
Neuroimage 35:759-70. 2007..These results show for the first time in humans, significantly shorter onset latencies in V1 for peripheral than parafoveal VF stimulations... - Clustering of early cortical responses to median nerve stimulation from average and single trial MEG and EEG signalsOvidiu F Zainea
Department of Physiology, Medical School, University of Patras, Patras, Greece
Brain Topogr 17:219-36. 2005..These indices can be based on average signals, as is routinely done with clinical EEG, but it could also rely on hitherto little utilized measures of ST variability... - Surface visualization of electromagnetic brain activityAlexandra Badea
Department of Physiology, Medical School, University of Patras, Panepistimioupolis, 26500 Rio-Patras, Greece
J Neurosci Methods 127:137-47. 2003..Integrating and visualizing complementary functional data into a single environment helps evaluating analysis and understanding structure/function relationships in normal and diseased brain...