Kazuo Hiraki - Academia.edu (original) (raw)

Papers by Kazuo Hiraki

電子情報通信学会技術研究報告 Nlp 非線形問題, Feb 7, 1997

認知科学 Cognitive Studies Bulletin of the Japanese Cognitive Science Society, Sep 1, 2012

Frontiers in Robotics and AI

Brain Sciences

Appropriately handling and switching exploration of novel knowledge and exploitation of existing ... more Appropriately handling and switching exploration of novel knowledge and exploitation of existing knowledge is a fundamental element of genuine innovation in society. Moreover, a mounting number of studies have suggested that such “ambidexterity” is associated not only with organizational performance but also with the human brain. Among these reports, however, there have not been any definitive MRI-based parameters that objectively and easily evaluate such ambidexterity. Therefore, an MRI-based index derived from gray matter volume, called the gray-matter brain healthcare quotient (GM-BHQ), was used to measure the association between ambidexterity and the entire human brain. For this purpose, 200 healthy adults were recruited as subjects to undergo structural T1-weighted imaging and to answer multiple psychological questionnaires. Ambidexterity was evaluated using two scales: the Curiosity and Exploration Inventory II and the Short Grit Scale, as exploration–exploitation indicators o...

Social neuroscience, Jan 22, 2018

External feedback plays an important role in adapting to the environment; however, feedback proce... more External feedback plays an important role in adapting to the environment; however, feedback processing in preschoolers has not been fully understood. The present event-related brain potential (ERP) study sought to understand the influence of parental presence with encouragement on feedback processing by focusing on reward positivity (RewP: mean amplitude between 200-350 ms). Five-year-old children (N = 21) completed an animal search task both alone (the alone condition) and with a parent who offered words of encouragement (the with a parent condition). ERPs were recorded while they received negative and positive feedback. We found a larger RewP amplitude in response to positive feedback in the with a parent condition relative to in the alone condition. In addition, differences in RewP between positive and negative feedback were only observed in the with a parent condition. These findings suggest that everyday parental encouragement has the potential to promote differential positive ...

Journal of the Robotics Society of Japan

Scientific reports, Nov 29, 2016

Though recent studies have elucidated the earliest mechanisms of processing in multisensory integ... more Though recent studies have elucidated the earliest mechanisms of processing in multisensory integration, our understanding of how multisensory integration of more sustained and complicated stimuli is implemented in higher-level association cortices is lacking. In this study, we used magnetoencephalography (MEG) to determine how neural oscillations alter local and global connectivity during multisensory integration processing. We acquired MEG data from 15 healthy volunteers performing an audio-visual speech matching task. We selected regions of interest (ROIs) using whole brain time-frequency analyses (power spectrum density and wavelet transform), then applied phase amplitude coupling (PAC) and imaginary coherence measurements to them. We identified prominent delta band power in the temporal pole (TP), and a remarkable PAC between delta band phase and beta band amplitude. Furthermore, imaginary coherence analysis demonstrated that the temporal pole and well-known multisensory areas ...

Brain and cognition, Apr 1, 2017

When near-infrared spectroscopy (NIRS) is used to measure emotion-related cerebral blood flow (CB... more When near-infrared spectroscopy (NIRS) is used to measure emotion-related cerebral blood flow (CBF) changes in the prefrontal cortex regions, the functional distinction of CBF changes is often difficult because NIRS is unable to measure neural activity in deeper brain regions that play major roles in emotional processing. The CBF changes could represent cognitive control of emotion and emotional responses to emotional materials. Supposing that emotion-related CBF changes in the prefrontal cortex regions during distraction are emotional responses, we examined whether oxygenated hemoglobin (oxyHb) decreases. Attention-demanding tasks cause blood flow decreases, and we thus compared the effects of visually paced tapping with different tempos, on distraction. The results showed that the oxyHb level induced by emotional stimulation decreased with fast-tempo tapping significantly more than slow-tempo tapping in ventral medial prefrontal cortex regions. Moreover, a Global-Local task follow...

Journal of Human-Robot Interaction, 2015

Proceedings of the 1997 IEEE/RSJ International Conference on Intelligent Robot and Systems. Innovative Robotics for Real-World Applications. IROS '97, 2000

Proceedings of 1993 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS '93), 2000

Infant Behavior and Development, Apr 30, 2008

Proceedings of the 15th International Joint Conference on Artifical Intelligence Volume 1, Aug 23, 1997