A A Ioannides

Summary

Affiliation: RIKEN Brain Science Institute
Country: Japan

Publications

  1. ncbi request reprint Timing and connectivity in the human somatosensory cortex from single trial mass electrical activity
    Andreas 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
  2. doi request reprint MEG identifies dorsal medial brain activations during sleep
    Andreas A Ioannides
    Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Wakoshi, Saitama, 351 0198, Japan
    Neuroimage 44:455-68. 2009
  3. doi request reprint Magnetoencephalography (MEG)
    Andreas A Ioannides
    Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Saitama, Japan
    Methods Mol Biol 489:167-88. 2009
  4. doi request reprint Attention modulates earliest responses in the primary auditory and visual cortices
    Vahe 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
  5. ncbi request reprint 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
  6. ncbi request reprint Coupling of regional activations in a human brain during an object and face affect recognition task
    A A Ioannides
    Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako Shi, Saitama, Japan
    Hum Brain Mapp 11:77-92. 2000
  7. ncbi request reprint Imaging cerebellum activity in real time with magnetoencephalographic data
    Andreas 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
  8. ncbi request reprint Real-time neural activity and connectivity in healthy individuals and schizophrenia patients
    Andreas A Ioannides
    Laboratory for Human Brain Dynamics, BSI, RIKEN, 2 1 Hirosawa, Wako Shi, Saitama, 351 0198, Japan
    Neuroimage 23:473-82. 2004
  9. ncbi request reprint MEG tomography of human cortex and brainstem activity in waking and REM sleep saccades
    Andreas 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
  10. ncbi request reprint Single-trial variability in early visual neuromagnetic responses: an explorative study based on the regional activation contributing to the N70m peak
    N A Laskaris
    Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, Wako Shi, Saitama 351 0198, Japan
    Neuroimage 20:765-83. 2003

Detail Information

Publications37

  1. ncbi request reprint Timing and connectivity in the human somatosensory cortex from single trial mass electrical activity
    Andreas 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...
  2. doi request reprint MEG identifies dorsal medial brain activations during sleep
    Andreas A Ioannides
    Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute, Wakoshi, Saitama, 351 0198, Japan
    Neuroimage 44:455-68. 2009
    ....
  3. doi request reprint 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...
  4. doi request reprint Attention modulates earliest responses in the primary auditory and visual cortices
    Vahe 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...
  5. ncbi request reprint 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...
  6. ncbi request reprint Coupling of regional activations in a human brain during an object and face affect recognition task
    A A Ioannides
    Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako Shi, Saitama, Japan
    Hum Brain Mapp 11:77-92. 2000
    ....
  7. ncbi request reprint Imaging cerebellum activity in real time with magnetoencephalographic data
    Andreas 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...
  8. ncbi request reprint Real-time neural activity and connectivity in healthy individuals and schizophrenia patients
    Andreas 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...
  9. ncbi request reprint MEG tomography of human cortex and brainstem activity in waking and REM sleep saccades
    Andreas 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...
  10. ncbi request reprint Single-trial variability in early visual neuromagnetic responses: an explorative study based on the regional activation contributing to the N70m peak
    N 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...
  11. ncbi request reprint Magnetoencephalographic evidence of the interhemispheric asymmetry in echoic memory lifetime and its dependence on handedness and gender
    Andreas 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...
  12. ncbi request reprint Real time human brain function: observations and inferences from single trial analysis of magnetoencephalographic signals
    A 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...
  13. ncbi request reprint Real time processing of affective and cognitive stimuli in the human brain extracted from MEG signals
    A 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...
  14. ncbi request reprint Consistent and precise localization of brain activity in human primary visual cortex by MEG and fMRI
    F 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...
  15. ncbi request reprint Dynamics of brain activity in motor and frontal cortical areas during music listening: a magnetoencephalographic study
    Mihai 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...
  16. ncbi request reprint Neural correlates of priming on occluded figure interpretation in human fusiform cortex
    L 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
    ....
  17. ncbi request reprint Contribution of the human superior parietal lobule to spatial selection process: an MEG study
    T 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...
  18. ncbi request reprint The human primary somatosensory cortex response contains components related to stimulus frequency and perception in a frequency discrimination task
    L 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...
  19. ncbi request reprint Early (N70m) neuromagnetic signal topography and striate and extrastriate generators following pattern onset quadrant stimulation
    A 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...
  20. ncbi request reprint Exploratory data analysis of evoked response single trials based on minimal spanning tree
    N A Laskaris
    Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako-shi 351-01, Japan
    Clin Neurophysiol 112:698-712. 2001
    ....
  21. ncbi request reprint Spatiotemporal dynamics and connectivity pattern differences between centrally and peripherally presented faces
    Lichan Liu
    Laboratory for Human Brain Dynamics, RIKEN Brain Science Institute BSI, 2 1 Hirosawa, Wakoshi, Saitama, 351 0198, Japan
    Neuroimage 31:1726-40. 2006
    ....
  22. pmc Wired for her face? Male attentional bias for female faces
    Yuka 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...
  23. ncbi request reprint Semantic geodesic maps: a unifying geometrical approach for studying the structure and dynamics of single trial evoked responses
    N A Laskaris
    Laboratory for Human Brain Dynamics, Brain Science Institute, RIKEN, Wako Shi 351 0198, Japan
    Clin Neurophysiol 113:1209-26. 2002
    ..The approach is based on conceptually simple geometrical ideas and enables the convergence of pattern analysis and non-linear time series analysis...
  24. doi request reprint Functional specialization and dynamic resource allocation in visual cortex
    Gijs 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...
  25. doi request reprint Modulus and direction of the neural current vector identify distinct functional connectivity modes between human MT+ areas
    Masaki 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...
  26. ncbi request reprint Localization of individual area neuronal activity
    N 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...
  27. ncbi request reprint Widely distributed magnetoencephalography spikes related to the planning and execution of human saccades
    Andreas 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...
  28. ncbi request reprint MEG study of short-term plasticity following multiple digit frequency discrimination training in humans
    Lichan 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...
  29. ncbi request reprint Dynamic functional connectivity
    Andreas 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...
  30. ncbi request reprint Brain activation sequences following electrical limb stimulation of normal and paraplegic subjects
    Andreas 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
    ....
  31. ncbi request reprint Effects of attention and arousal on early responses in striate cortex
    Vahe 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...
  32. ncbi request reprint The "mosaic stage" in amodal completion as characterized by magnetoencephalography responses
    Gijs Plomp
    RIKEN Brain Science Institute BSI, Saitama, Japan
    J Cogn Neurosci 18:1394-405. 2006
    ....
  33. ncbi request reprint Magnetoencephalography as a research tool in neuroscience: state of the art
    Andreas 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...
  34. doi request reprint MEG's ability to localise accurately weak transient neural sources
    Christos 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...
  35. ncbi request reprint Precise mapping of early visual responses in space and time
    Vahe 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...
  36. ncbi request reprint Clustering of early cortical responses to median nerve stimulation from average and single trial MEG and EEG signals
    Ovidiu 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...
  37. ncbi request reprint Surface visualization of electromagnetic brain activity
    Alexandra 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...