• A brain structural hub of interhemispheric information integration for apparent motion perception.
    with Hiroaki Mano and Kazuhisa Niki
    Cerebral Cortex 2012 (22): 337. 2012.
    We investigated the key anatomical structures mediating interhemispheric integration during the perception of apparent motion across the retinal midline. Previous studies of commissurotomized patients suggest that subcortical structures mediate interhemispheric transmission but the specific regions involved remain unclear. Here, we exploit interindividual variations in the propensity of normal subjects to perceive horizontal motion, in relation to vertical motion. We characterize these differenc…Read more
  • Neural processes for intentional control of perceptual switching: An MEG study.
    with Keichi Kitajo and Tsunehiro Takeda
    Human Brain Mapping 32 (3): 397. 2011.
    This article reports an interesting link between the psychophysical property of intentional control of perceptual switching and the underlying neural activities. First, we revealed that the timing of perceptual switching for a dynamical dot quartet can be controlled by the observers' intention, without eye movement. However, there is a clear limitation to this control, such that each animation frame of the stimulus must be presented for a sufficiently long time length; in other words, the freque…Read more
  • Functional modulation of power-law distribution in visual perception.
    with Takashi Owaki, Kaoru Amano, Keichi Kitajo, and Tsunehiro Takeda
    Physical Review E 75 (75): 051902. 2007.
    Neuronal activities have recently been reported to exhibit power-law scaling behavior. However, it has not been demonstrated that the power-law component can play an important role in human perceptual functions. Here, we demonstrate that the power spectrum of magnetoencephalograph recordings of brain activity varies in coordination with perception of subthreshold visual stimuli. We observed that perceptual performance could be better explained by modulation of the power-law component than by mod…Read more
  • Global mapping of the whole-brain network underlining binocular rivalry.
    with Kazuhisa Niki
    Brain Connectivity 3 (2): 212. 2013.
    We investigated how the structure of the brain network relates to the stability of perceptual alternation in binocular rivalry. Historically, binocular rivalry has provided important new insights to our understandings in neuroscience. Although various relationships between the local regions of the human brain structure and perceptual switching phenomena have been shown in previous researches, the global organization of the human brain structural network relating to this phenomenon has not yet be…Read more
  • The brain is a very complex structure. Over the past several decades, many studies have aimed to understand how various non-uniform variables relate to each other. The current study compared the whole-brain network organization and global spatial distribution of cell densities in the monkey brain. Wide comparisons between 27 graph theoretical measures and cell densities revealed that only participation coefficients (PCs) significantly correlated with cell densities. Interestingly, PCs did not sh…Read more