A Iwanami

Summary

Affiliation: University of Tokyo
Country: Japan

Publications

  1. ncbi request reprint P300 amplitude over temporal regions in schizophrenia
    Akira Iwanami
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Japan
    Eur Arch Psychiatry Clin Neurosci 252:1-7. 2002
  2. ncbi request reprint Effects of risperidone on event-related potentials in schizophrenic patients
    A Iwanami
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Japan
    Pharmacopsychiatry 34:73-9. 2001
  3. ncbi request reprint Event-related potentials and thought disorder in schizophrenia
    A Iwanami
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyoku, Tokyo, Japan
    Schizophr Res 42:187-91. 2000
  4. ncbi request reprint Impaired suppression of processing in schizophrenic patients suggested by ERPs obtained in a selective attention task
    S Kamio
    Department of Psychiatry, Tokyo Metropolitan Matsuzawa Hospital, 2-1-1 Kamikitazawa, Setagaya-ku, 156-0057, Tokyo, Japan
    Schizophr Res 49:213-21. 2001
  5. ncbi request reprint Shortening of N1 and P3 latencies in event-related potentials observed coincidentally with clinical improvement during nootropic medication in a demented patient: specific effect of nicergoline
    M Fukuda
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Japan
    Jpn J Psychiatry Neurol 46:919-25. 1992
  6. pmc Event-related potentials during a selective attention task with short interstimulus intervals in patients with schizophrenia
    A Iwanami
    Department of Psychiatry, Showa University School of Medicine, Tokyo, Japan
    J Psychiatry Neurosci 23:45-50. 1998
  7. pmc Voxel-based analysis of MRI reveals anterior cingulate gray-matter volume reduction in posttraumatic stress disorder due to terrorism
    H Yamasue
    Department of Neuropsychiatry and Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Proc Natl Acad Sci U S A 100:9039-43. 2003
  8. ncbi request reprint Auditory event-related potentials in panic disorder
    A Iwanami
    Department of Psychiatry, Showa University School of Medicine, Tokyo, Japan
    Eur Arch Psychiatry Clin Neurosci 247:107-11. 1997
  9. ncbi request reprint Brain lateralization for mismatch response to across- and within-category change of vowels
    K Kasai
    Departments of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
    Neuroreport 12:2467-71. 2001
  10. ncbi request reprint Relapse of panic disorder induced by a single intravenous methamphetamine injection
    A Iwanami
    Department of Psychiatry, Showa University School of Medicine, Tokyo, Japan
    J Anxiety Disord 11:113-6. 1997

Collaborators

Detail Information

Publications48

  1. ncbi request reprint P300 amplitude over temporal regions in schizophrenia
    Akira Iwanami
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Japan
    Eur Arch Psychiatry Clin Neurosci 252:1-7. 2002
    ....
  2. ncbi request reprint Effects of risperidone on event-related potentials in schizophrenic patients
    A Iwanami
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Japan
    Pharmacopsychiatry 34:73-9. 2001
    ..These findings suggest that risperidone may speed the information processing in schizophrenic patients, contributing to the improvement of cognitive functions...
  3. ncbi request reprint Event-related potentials and thought disorder in schizophrenia
    A Iwanami
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyoku, Tokyo, Japan
    Schizophr Res 42:187-91. 2000
    ..These results suggest that a reduction in P300 amplitude is associated with a fundamental impairment of information processing in schizophrenic patients...
  4. ncbi request reprint Impaired suppression of processing in schizophrenic patients suggested by ERPs obtained in a selective attention task
    S Kamio
    Department of Psychiatry, Tokyo Metropolitan Matsuzawa Hospital, 2-1-1 Kamikitazawa, Setagaya-ku, 156-0057, Tokyo, Japan
    Schizophr Res 49:213-21. 2001
    ..Significant between-group differences were obtained specifically in the right ear attended condition, suggesting impaired suppression of processing in schizophrenics mediated in the left hemisphere...
  5. ncbi request reprint Shortening of N1 and P3 latencies in event-related potentials observed coincidentally with clinical improvement during nootropic medication in a demented patient: specific effect of nicergoline
    M Fukuda
    Department of Neuropsychiatry, Faculty of Medicine, University of Tokyo, Japan
    Jpn J Psychiatry Neurol 46:919-25. 1992
    ..Such a longitudinal study design was considered to be useful for quantifying and objectively comparing effects of various nootropics noninvasively...
  6. pmc Event-related potentials during a selective attention task with short interstimulus intervals in patients with schizophrenia
    A Iwanami
    Department of Psychiatry, Showa University School of Medicine, Tokyo, Japan
    J Psychiatry Neurosci 23:45-50. 1998
    ..To study selective attention in schizophrenia by examining event-related potentials during a dichotic listening task with short interstimulus intervals (ISIs)...
  7. pmc Voxel-based analysis of MRI reveals anterior cingulate gray-matter volume reduction in posttraumatic stress disorder due to terrorism
    H Yamasue
    Department of Neuropsychiatry and Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Proc Natl Acad Sci U S A 100:9039-43. 2003
    ....
  8. ncbi request reprint Auditory event-related potentials in panic disorder
    A Iwanami
    Department of Psychiatry, Showa University School of Medicine, Tokyo, Japan
    Eur Arch Psychiatry Clin Neurosci 247:107-11. 1997
    ..The two groups did not differ significantly in P3 latency and amplitude. The larger N1 and N2 amplitudes in the PD patients are suggestive of alteration of early information processing in PD...
  9. ncbi request reprint Brain lateralization for mismatch response to across- and within-category change of vowels
    K Kasai
    Departments of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
    Neuroreport 12:2467-71. 2001
    ..Thus, the relative contribution of the left auditory cortex in the preattentive speech processing may occur only at the level of perception of the vowel across-category change...
  10. ncbi request reprint Relapse of panic disorder induced by a single intravenous methamphetamine injection
    A Iwanami
    Department of Psychiatry, Showa University School of Medicine, Tokyo, Japan
    J Anxiety Disord 11:113-6. 1997
    ..Soon after an intravenous injection of methamphetamine, she had a relapse of panic disorder, and depression and agoraphobia developed. Psychotropic medication was not fully effective...
  11. ncbi request reprint 1H-MR spectroscopy and gray matter volume of the anterior cingulate cortex in schizophrenia
    H Yamasue
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Neuroreport 13:2133-7. 2002
    ..These results provide further support to the idea that the measures of H-MRS indicate not only neuronal loss but also neuronal dysfunction in schizophrenia...
  12. ncbi request reprint Electrophysiological indices associated with social functioning outcome in schizophrenia: a 5-year follow-up study
    Keiko Maeda
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Bunkyo ku, Tokyo 113 8655, Japan
    Neurosci Res 51:215-8. 2005
    ..N2b amplitude, an electrophysiological index of orienting response, may be associated with longitudinal social functioning outcome in schizophrenia...
  13. ncbi request reprint Association between lower P300 amplitude and smaller anterior cingulate cortex volume in patients with posttraumatic stress disorder: a study of victims of Tokyo subway sarin attack
    Tsuyoshi Araki
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Tokyo 113 8655, Japan
    Neuroimage 25:43-50. 2005
    ..These results provide the first evidence that electrophysiological deficits of controlled attention observed in patients with PTSD may be linked to underlying brain morphological abnormalities...
  14. ncbi request reprint Support for relationship between serum cholinesterase and post-traumatic stress disorder; 5-year follow-ups of victims of the Tokyo subway sarin poisoning
    Mamoru Tochigi
    Neurosci Res 52:129-31. 2005
  15. ncbi request reprint Delayed automatic detection of change in speech sounds in adults with autism: a magnetoencephalographic study
    Kiyoto Kasai
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, 113 8655 Tokyo, Japan
    Clin Neurophysiol 116:1655-64. 2005
    ..e. automatic change detection of speech and non-speech sounds, using magnetoencephalographic recording of mismatch response elicited by change in vowels and tones...
  16. ncbi request reprint Confirmation of a relationship between reduced auditory P300 amplitude and thought disorder in schizophrenia
    Kenji Kirihara
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyoku, Tokyo 113 8655, Japan
    Schizophr Res 80:197-201. 2005
    ..These results further suggest that electrophysiological abnormalities of information processing may underlie positive thought disorder in schizophrenia...
  17. ncbi request reprint Post-traumatic stress disorder symptoms in victims of Tokyo subway attack: a 5-year follow-up study
    Toshiyuki Ohtani
    Department of Psychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
    Psychiatry Clin Neurosci 58:624-9. 2004
    ..A significant correlation between the total score of Impact of Event Scale-Revised (IES-R) and CAPS was found, indicating that IES-R is a useful tool for evaluating PTSD...
  18. ncbi request reprint Brain electric activity for active inhibition of auditory irrelevant information
    Tsuyoshi Araki
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Neurosci Lett 374:11-6. 2005
    ..These results suggest that auditory selective attention process involves not only focusing attention on relevant information, but also inhibitory processing of irrelevant information mediated by the frontal cortex...
  19. ncbi request reprint Perospirone in the treatment of schizophrenia: effect on verbal memory organization
    Tsuyoshi Araki
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Prog Neuropsychopharmacol Biol Psychiatry 30:204-8. 2006
    ..Negative symptoms and extrapyramidal side effects were also ameliorated after switching to perospirone. The distinct cognitive enhancement profile of perospirone may be attributable to its partial 5-HT1A agonist action...
  20. ncbi request reprint Comparison between mismatch negativity amplitude and magnetic mismatch field strength in normal adults
    Noriko Kudo
    Department of Cognitive and Information Sciences, Graduate School of Humanities, Chiba University, Chiba, Japan
    Biol Psychol 71:54-62. 2006
    ..To further clarify the differential significance of recording MMN/MMF may be important to establish MMN/MMF as clinical indices of individual ability of preattentive stage of auditory processing...
  21. ncbi request reprint Increased positive thought disorder with illness duration in patients with schizophrenia
    Keiko Maeda
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Bunkyo ku, Tokyo, Japan
    Psychiatry Clin Neurosci 61:687-90. 2007
    ..TDI scores were not associated with verbal memory or executive functioning. These results indicate an ongoing worsening of positive thought disorder through the course of illness in schizophrenia...
  22. ncbi request reprint Electrophysiological abnormalities of spatial attention in adults with autism during the gap overlap task
    Yuki Kawakubo
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Tokyo, Japan
    Clin Neurophysiol 118:1464-71. 2007
    ..We evaluated event-related potentials (ERPs) elicited by attentional disengagement in individuals with autism...
  23. ncbi request reprint Phonetic mismatch negativity predicts social skills acquisition in schizophrenia
    Yuki Kawakubo
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Psychiatry Res 152:261-5. 2007
    ..Although preliminary, these results suggest that phonetic MMN could be an index of social skills acquisition in patients with schizophrenia...
  24. ncbi request reprint Reduced planum temporale volume and delusional behaviour in patients with schizophrenia
    Syudo Yamasaki
    Department of Rehabilitation, Graduate School of Medicine, The University of Tokyo, Tokyo, 113 8655, Japan
    Eur Arch Psychiatry Clin Neurosci 257:318-24. 2007
    ....
  25. ncbi request reprint Human brain structural change related to acute single exposure to sarin
    Hidenori Yamasue
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
    Ann Neurol 61:37-46. 2007
    ....
  26. ncbi request reprint Auditory P300 latency prolongation with age in schizophrenia: gender and subcomponent effects
    Tsuyoshi Araki
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Schizophr Res 88:217-21. 2006
    ..Our findings may provide evidence for progressive change in the brain function in schizophrenia, and this change may be slower in female than male patients. P3b may serve as a more sensitive index for cognitive decline than P3a...
  27. ncbi request reprint The effect of perospirone on auditory P300 in schizophrenia: a preliminary study
    Tsuyoshi Araki
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Japan
    Prog Neuropsychopharmacol Biol Psychiatry 30:1083-90. 2006
    ..These results suggest that clinical improvement in response to perospirone in some patients may, at least in part, be mediated through cognitive change indexed by P300 in chronic schizophrenia...
  28. ncbi request reprint Voxel-based diffusion tensor analysis reveals aberrant anterior cingulum integrity in posttraumatic stress disorder due to terrorism
    Osamu Abe
    Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Psychiatry Res 146:231-42. 2006
    ..The present study demonstrated further evidence of abnormalities of both the ACC, a structure that is pivotally involved in attention, emotional regulation, and fear conditioning, and of subjacent white matter in the pathology of PTSD...
  29. ncbi request reprint Localized volume reduction in prefrontal, temporolimbic, and paralimbic regions in schizophrenia: an MRI parcellation study
    Hidenori Yamasue
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo, Tokyo 113 8655, Japan
    Psychiatry Res 131:195-207. 2004
    ..These findings indicate the importance of ACG abnormalities in the pathophysiology of schizophrenia...
  30. ncbi request reprint Executive and prefrontal dysfunction in unipolar depression: a review of neuropsychological and imaging evidence
    Mark A Rogers
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1, Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Neurosci Res 50:1-11. 2004
    ..However, the limited number of such studies conducted to date means that conclusions must be tentative and further studies employing this combined approach may be of great value...
  31. ncbi request reprint Abnormal association between reduced magnetic mismatch field to speech sounds and smaller left planum temporale volume in schizophrenia
    Hidenori Yamasue
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Bunkyo, Tokyo 113 8655, Japan
    Neuroimage 22:720-7. 2004
    ..These results suggest that structural abnormalities of the planum temporale may underlie the functional abnormalities of fundamental language-related processing in schizophrenia...
  32. ncbi request reprint Do high or low doses of anxiolytics and hypnotics affect mismatch negativity in schizophrenic subjects? An EEG and MEG study
    Kiyoto Kasai
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Clin Neurophysiol 113:141-50. 2002
    ....
  33. ncbi request reprint No effect of gender on tonal and phonetic mismatch negativity in normal adults assessed by a high-resolution EEG recording
    Kiyoto Kasai
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, 113 8655, Tokyo, Japan
    Brain Res Cogn Brain Res 13:305-12. 2002
    ....
  34. ncbi request reprint Impaired cortical network for preattentive detection of change in speech sounds in schizophrenia: a high-resolution event-related potential study
    Kiyoto Kasai
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Japan
    Am J Psychiatry 159:546-53. 2002
    ..The goal in this study was to obtain an electrophysiological index of preattentive detection of change in speech sounds by schizophrenic patients...
  35. ncbi request reprint Neuroanatomy and neurophysiology in schizophrenia
    Kiyoto Kasai
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
    Neurosci Res 43:93-110. 2002
    ..Finally, we addressed the issue of the heterogeneity of schizophrenia from the neurobiological perspective, in relation to the neuroanatomical and neurophysiological measures...
  36. ncbi request reprint The effects of benzodiazepines on event-related potential indices of automatic and controlled processing in schizophrenia: a preliminary report
    Tadashi Murakami
    Department of Neuropsychiatry, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan
    Prog Neuropsychopharmacol Biol Psychiatry 26:651-61. 2002
    ..This suggested that benzodiazepines induce delayed stimulus classification processing in schizophrenic patients...
  37. ncbi request reprint Psychophysiological index during auditory selective attention correlates with visual continuous performance test sensitivity in normal adults
    Kiyoto Kasai
    Department of Psychiatry, Harvard Medical School, Brockton VA Medical Center, Department of Psychiatry 116A, 940 Belmont Street Brockton, Boston, MA 02301, USA
    Int J Psychophysiol 45:211-25. 2002
    ..This finding suggests that the controlled deviance detection process was related to DSCPT performance...
  38. ncbi request reprint Serum cholesterol, uric acid and cholinesterase in victims of the Tokyo subway sarin poisoning: a relation with post-traumatic stress disorder
    Mamoru Tochigi
    Department of Psychiatry, Haryugaoka Hospital, Fukushima, Japan
    Neurosci Res 44:267-72. 2002
    ..02, t-test). This might partly reflect a long-term remnant effect of sarin intoxication, although an effect of the psychological experience could not be totally excluded...
  39. ncbi request reprint Neuromagnetic correlates of impaired automatic categorical perception of speech sounds in schizophrenia
    Kiyoto Kasai
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Schizophr Res 59:159-72. 2003
    ..The language-related dysfunction in schizophrenic patients may be present at the early stage of auditory processing of relatively simple stimuli such as phonemes, and not just at stages involving higher order semantic processes...
  40. ncbi request reprint Activation of the prefrontal cortex to trauma-related stimuli measured by near-infrared spectroscopy in posttraumatic stress disorder due to terrorism
    Koji Matsuo
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
    Psychophysiology 40:492-500. 2003
    ..Significantly enhanced SCR was also observed in the victims with PTSD during trauma-related stimuli. The findings suggest that measurement of cerebral hemodynamic response by NIRS is useful for psychophysiological assessment of PTSD...
  41. ncbi request reprint Drug-induced parkinsonism in relation to choline-containing compounds measured by 1H-MR spectroscopy in putamen of chronically medicated patients with schizophrenia
    Hidenori Yamasue
    Department of Neuropsychiatry, University of Tokyo, Tokyo, Japan
    Int J Neuropsychopharmacol 6:353-60. 2003
    ..These results suggest a potential of 1H-MRS as a non-invasive monitoring method of neurobiological correlates of EPS associated with neuroleptic treatments in patients with schizophrenia...
  42. ncbi request reprint Effects of corollary discharge on event-related potentials during selective attention task in healthy men and women
    Noriko Kudo
    Okanoya Laboratory, Department of Cognitive and Information Sciences, Graduate School of Humanities, Chiba University, 1 33 Yayoi cho, Inage Ku, Chiba 263 8522, Japan
    Neurosci Res 48:59-64. 2004
    ..These results suggest that the effect of corollary discharge on auditory ERPs is limited to the perceptual stage of information processing in healthy men and women...
  43. ncbi request reprint Spatial attention in individuals with pervasive developmental disorders using the gap overlap task
    Yuki Kawakubo
    Doctoral Degree Program of Disability Sciences, University of Tsukuba, 1 1 1 Tennodai, Tsukuba, Ibaraki, 305 8572, Japan
    Psychiatry Res 125:269-75. 2004
    ..We conclude that individuals with PDD have deficiencies in attentional engagement. Moreover, our study suggests that analysis of the express saccade will be useful in further examinations of attentional processes in PDD...
  44. ncbi request reprint Verbal and procedural memory in schizophrenia with milder symptoms: implications for psychosocial intervention
    Akira Watanabe
    Schizophr Res 53:263-5. 2002
  45. ncbi request reprint [Treatment algorithms for mood disorders]
    Akihiko Oshima
    Department of Psychiatry, Tatebayashi Kosei Hospital, 262 1, Narushima cho, Tatebayashi, 374 8533 Japan
    Nihon Shinkei Seishin Yakurigaku Zasshi 23:155-9. 2003
    ..They pointed out the potential for every clinician to use the current algorithms, which are rather rough, in a way that reflects his or her individuality and in close interaction with patients...
  46. ncbi request reprint Hypoactivation of the prefrontal cortex during verbal fluency test in PTSD: a near-infrared spectroscopy study
    Koji Matsuo
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
    Psychiatry Res 124:1-10. 2003
    ..The 'frontal dysfunction' observed in subjects with PTSD may be a secondary phenomenon to reduced attentional capacity...
  47. ncbi request reprint Smoking habits in Japanese patients with schizophrenia
    Takeyuki Mori
    Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
    Psychiatry Res 120:207-9. 2003
    ..Variables associated with smoking were also different from those reported in the Western literature. Different cultural backgrounds may underlie the differing results in Western and Japanese populations...
  48. ncbi request reprint Season of birth in Japanese patients with schizophrenia
    Masahiko Tatsumi
    Department of Psychiatry, Showa University Fujigaoka Hospital, Kanagawa, Japan
    Schizophr Res 54:213-8. 2002
    ..More significant seasonality of birth in male patients than in female patients might be related to more susceptibility to pre- or perinatal disturbances in neurodevelopment in males than in females...