Taro Maeda

National Institute of Information and Communications Technology, Edo, Tokyo, Japan

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Publications (140)

  • Conference Paper · Mar 2016
  • Wataru Torii · Shinpei Fujimoto · Masahiro Furukawa · [...] · Taro Maeda
    Conference Paper · Jan 2016
  • [Show abstract] [Hide abstract] ABSTRACT: "The illusion of agency" arises when individuals look at own and other's hand motions alternately from a first person perspective (Takumi Yokosaka, 2014). Here, agency is a kind of cognition whereby people perceive both congruent movement (CM) and incongruent movement (IM) as a united, single, and continuous motion of one's own hand. The report says apparent motion (AM) perceived between CM and IM. Then, we consider there are two directional AM repeatedly (from own hand toward other's one and vice versa) and integration between the two occurs. So, to make AM occurrence denser despite, a CM-IM sequence lasts 250ms despite the former 500ms. And to prevent from interaction between the lasting time ratio of CM:IM and the two AM velocity difference, we used 1:1 despite the former 1:2. IM is a recorded movement of a gloved hand. We asked subject to keep his hand close to the IM. We experimented under three conditions below: (#1) CM lasts 125ms and IM does 125ms without black frame, (#2) 83ms black frame inserted after the sequence of 83ms CM and 83ms IM, (#3) after 83ms CM, two split 41ms-black frames were inserted before and after 83ms IM. As a result, the three in four subjects told the recorded movement is observed in each trial under the condition #1 and #3 while hardly did under #2. "The illusion of agency" was relatively observed under all condition. The fact that the CM and IM were not integrated as a single movement under #1 and #3 indicates the illusion was weaker than #2. Supposing the inserted black frame makes the AM slower, the two-AM-velocity difference is dominant. Therefore, the integrated difference yields the polarity of direction towards the other's hand. This seems to induce own hand's predicted position closer to the other's hand unconsciously. Meeting abstract presented at VSS 2015.
    Article · Sep 2015 · Journal of Vision
  • [Show abstract] [Hide abstract] ABSTRACT: Galvanic vestibular stimulation (GVS) can be applied to induce the feeling of directional virtual head motion by stimulating the vestibular organs electrically. Conventional studies used a two-pole GVS, in which electrodes are placed behind each ear, or a three-pole GVS, in which an additional electrode is placed on the forehead. These stimulation methods can be used to induce virtual head roll and pitch motions when a subject is looking upright. Here, we proved our hypothesis that there are current paths between the forehead and mastoids in the head and show that our invented GVS system using four electrodes succeeded in inducing directional virtual head motion around three perpendicular axes containing yaw rotation by applying different current patterns. Our novel method produced subjective virtual head yaw motions and evoked yaw rotational body sway in participants. These results support the existence of three isolated current paths located between the mastoids, and between the left and right mastoids and the forehead. Our findings show that by using these current paths, the generation of an additional virtual head yaw motion is possible.
    Article · May 2015 · Scientific Reports
  • [Show abstract] [Hide abstract] ABSTRACT: In developing wearable computing technology, it is often desirable to produce the sensation of tapping a virtual object in mid-air. Such a tapping sensation consists of not only tactile sensations at the fingertips but also force feedbacks to the musculoskeletal system. Therefore, physical interactions with objects ostensibly involve an integration of tactile sensations with force feedback to the musculoskeletal system when perceived objects are contacted. In this study, we propose a method that combines electro-tactile stimulation (ETS) for tactile receptors with functional electro-stimulation (FES) for the musculoskeletal system. The results of an experimental study show that simultaneous perception was reportedly obtained when ETS was delayed by 25 ms after FES when tapping a rigid virtual object.
    Article · Jan 2015
  • Ming Chang · Hiroyuki Iizuka · Yasushi Naruse · [...] · Taro Maeda
    Conference Paper · Jan 2015
  • Source
    Ming Chang · Hiroyuki Iizuka · Yasushi Naruse · [...] · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: Neurofeedback is a strong direct training method for brain function, wherein brain activity patterns are measured and displayed as feedback, and trainees try to stabilize the feedback signal onto certain desirable states to regulate their own mental states. Here, we introduce a novel neurofeedback method, using the mismatch negativity (MMN) responses elicited by similar sounds that cannot be consciously discriminated. Through neurofeedback training, without participants' attention to the auditory stimuli or awareness of what was to be learned, we found that the participants could unconsciously achieve a significant improvement in the auditory discrimination of the applied stimuli. Our method has great potential to provide effortless auditory perceptual training. Based on this method, participants do not need to make an effort to discriminate auditory stimuli, and can choose tasks of interest without boredom due to training. In particular, it could be used to train people to recognize speech sounds that do not exist in their native language and thereby facilitate foreign language learning.
    Full-text Article · Oct 2014 · Scientific Reports
  • Takumi Yokosaka · Hiroyuki Iizuka · Tomoko Yonemura · [...] · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: We report a novel illusion whereby people perceive both congruent and incongruent hand motions as a united, single, and continuous motion of one's own hand (i.e. a sense of agency). This arises when individuals watch congruent and incongruent hand motions alternately from a first person perspective. Despite an individual knowing that s/he is not performing the motion, this illusion still can arise. Although a sense of agency might require congruency between predicted and actual movements, united motion is incongruent with predicted movement because the motion contains oscillating movement which results from switching hand movement images. This illusion offers new insights into the integration mechanism of predicted and observed movements on agency judgment. We investigated this illusion from a subjective experience point of view and from a motion response point of view.
    Article · Aug 2014 · Scientific Reports
  • [Show abstract] [Hide abstract] ABSTRACT: The principle of glasses-free 3D displays (each eye sees a different image without wearing glasses) can create a fully natural sensation of depth. In conventional principles, lenticular lenses or parallax barriers are placed in front of an image source, such as a liquid crystal display, to allow it to show a stereoscopic image. A disadvantage of the technology is that the resolution of perceived images is limited by the diffraction at the lenticular lenses or parallax barrier. To overcome this limit, we improved the technique by using the human perceptual feature known as slit viewing. When a figure moves behind stationary narrow slits, observers can see the moving figure as an integrated whole, a phenomenon known as slit viewing.
    Article · Jul 2014
  • Ming Chang · Hiroyuki Iizuka · Yasushi Naruse · [...] · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: There are a lot of skills that it takes time for us to learn in our life. To be precise, it is not clear what and how to learn. For example, one of the biggest problems in the language learning is that learners cannot recognize novel sounds that do not exist in their native language, and it is difficult to gain a listening ability for these novel sounds [1]. Here, we developed a novel neurofeedback (NF) method, using the mismatch negativity (MMN) responses elicited by similar sounds, that can help people to unconsciously improve their auditory perceptual skills. In our method, the strength of the participants' MMN as a measure of perceptual discriminability is presented as visual feedback to provide a continuous, not binary, cue for learning. We found evidence that significant performance improvement for behavioral auditory discrimination and neurophysiological measure occurs unconsciously. Based on our findings, the method has great potential to provide effortless auditory perceptual training and develop an unconscious learning interface device.
    Conference Paper · Mar 2014
  • [Show abstract] [Hide abstract] ABSTRACT: This study reports that the effect of galvanic vestibular stimulation (GVS) can be enhanced by giving a countercurrent before the normal current stimulation in the forward direction. In order to investigate the effect of the countercurrent on GVS, we applied various kinds of amplitudes and durations of the countercurrent before the normal stimulation. The strength of the effect was measured by the subjective response and body sway. As a result, the enhancing effect by the countercurrent does not only appear in the objective response but also in the subjective reports and we found that the effect of the countercurrent was enhanced in response to the amount of charges of the countercurrent before normal stimulations. Our result implies that there is a capacitor on the current path that enhances the GVS effect by the countercurrent.
    Conference Paper · Dec 2013
  • Hiroyuki Iizuka · Hideyuki Ando · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: This study presents an extended dynamic neural network model of homeostatic adaptation as the first step toward constructing a model of mental imagery. In the homeostatic adaptation model, higher-level dynamics internally self-organized from sensorimotor dynamics are associated with desired behaviors. These dynamics are regenerated when drastic changes occur, which might break the internal dynamics. Due to the weak link between desired behavior and internal homeostasis in the original homeostatic adaptation model, adaptivity is limited. In this paper, we improve on the homeostatic adaptation model to create a stronger link between desired behavior and internal homeostasis by introducing a metabolic causation in a plasticity mechanism and show that it becomes more adaptive. Our results show that our model has three different time scales in the adaptive behaviors, which are discussed with our cognition and mental imagery.
    Article · Aug 2013 · Adaptive Behavior
  • [Show abstract] [Hide abstract] ABSTRACT: We propose a novel method to navigate one's head rotation and position when two persons perform cooperative work with wearing head-mounted display, which is called view-sharing system. It is necessary to synchronize and match their head motions between two persons. In this system, the head motion is transmitted and guided by the target-maker shown in the user's view. In a conventional method, the partner's head position was shown in the view as target marker. In this paper, the marker was modified in terms of two typical human motion patterns; changing point of view by moving one's head around the target object, and changing one's gaze point by turning the head. Our proposed method was evaluated with the head tracking task and showed the effectiveness.
    Conference Paper · Mar 2013
  • Tomohiro Amemiya · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: This paper describes the development of an application that uses sensors in a smartphone to estimate a user's chest compression motion in performing cardiopulmonary resuscitation (CPR). In our system, the smartphone measures the motion of chest compression with accelerometer sensors and provides an audiovisual and tactile feedback to conduct proper chest compression CPR. We evaluated our estimation algorithms while conducting chest compressions on a mannequin and compared the error between the estimated position and ground truth position.
    Conference Paper · Mar 2013
  • Hiroyuki Iizuka · Mika Sunagawa · Masataka Niwa · [...] · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: Our aim of this study is to investigate the possibility of estimating interruptibility from Electroencephalograms (EEG). We focus on contingent negative variation which is elicited in response to concentration. Our results support that our method could correctly detects the user's internal states such as just watching or actively remembering even the external situations were completely same and also CNV is elicited when controlling continuous motion.
    Conference Paper · Mar 2013
  • [Show abstract] [Hide abstract] ABSTRACT: As a low-cost information display in public spaces, we achieved a multi-slit display by the arrangement of LED columns. Multi-slits visually present an image pattern through columns of slits that are arranged several spaces wide. They cannot be perceived image by stop patterns, but they can be perceived by scroll patterns. In this paper, we experimentally show that stereoscopic vision is possible by presenting binocular parallax images that impart the beam direction from slits.
    Conference Paper · Mar 2013
  • Tomohiro Amemiya · Taro Maeda
    Article · Jan 2013 · Journal of Japan Society for Fuzzy Theory and Intelligent Informatics
  • Yoshito Kumakura · Yuki Hashimoto · Daisuke Kondo · [...] · Taro Maeda
    [Show abstract] [Hide abstract] ABSTRACT: When human exercises multi-degrees of freedom (DOF) motion, they just pay attention to only part of the body motion and can control the whole body motion. By consciously adjusting low-DOF movements, it is possible to induce multi-DOF motion, which is referred as a “knack” in the sport. Acquiring knacks can drastically improve multi-DOF motor skills by low-DOF information presentation, and it is also used in motor learning. We consider that “knack” is “what induces multi-DOF motion by low-DOF information presentation” and “what improves motor skills”. In this study, we investigated whether multi-DOF motion can be induced by single-DOF information presentation, that is sound frequency, and whether motor skills are improved through our human experiments.
    Conference Paper · Dec 2012
  • [Show abstract] [Hide abstract] ABSTRACT: When training for dance or sports, amateurs observe and mimic the physical exertion of experts to acquire skill by observing others. However, humans don't memorize consecutive operations, but instead make discrete divisions and memorize body movements. The posture that becomes a key from consecutive operations is removed and memorized for discretion in a process we call segmentation. The movement is reproduced by smooth interpolations between the clause and the clause memorized as segmentation. In the first experiment, we clarified the existence of this segmentation by showing video of smooth movements to participants who selected the segment/frame that became a key. We confirmed commonness in this segment selection. In experiment 2, to reflect the physical exertion that made the segmentation, the participants input force to force sensors by a control stick. We showed video of smooth movements to them and simultaneously input the force pattern that corresponds to the movement. The force pattern, which uniformly converges by such repetition, is different depending on each participant. We call this method the “extraction of segmented behavioral intention.” On the other hand, we can arbitrarily change the speed of the physical exertion by expanding and contracting the segments of the movement video that obtained the force pattern by “extraction of segmented behavioral intention.” Since the expanded and contracted pattern range at a certain speed even when the movement speed changed, we preserved the shape and the selected segments. However, the segment shape changes when the movement speed is constantly fast.
    Conference Paper · Sep 2012
  • [Show abstract] [Hide abstract] ABSTRACT: This study presents an experiment that integrates a semiotic investigation with a dynamical perspective on embodied social interactions. The primary objective is to study co-creativity of a communication system on the human-human nonverbal interaction. Throughout the experiment, the results of established communication system on uni- and bi-directional interactions are compared. Finally, the role of co-creativity in the evolution of communication systems will be discussed.
    Conference Paper · Sep 2012

Publication Stats

1k Citations


  • 2014
    • National Institute of Information and Communications Technology
      • Center for Information and Neural Networks
      Edo, Tokyo, Japan
  • 2008-2013
    • Osaka University
      • • Graduate School of Information Science and Technology
      • • Department of Bioinformatic Engineering
      Suika, Ōsaka, Japan
  • 2011
    • Le Centre de Recherche en Économie et Statistique
      Malakoff, Île-de-France, France
  • 2010
    • Osaka City University
      Ōsaka, Ōsaka, Japan
  • 2002-2008
    • NTT Communication Science Laboratories
      • Human Information Science Laboratory
      Kioto, Kyoto, Japan
    • Japan Science and Technology Agency (JST)
      Edo, Tōkyō, Japan
  • 1991-2008
    • The University of Tokyo
      • • Graduate School of Information Science and Technology
      • • Department of Medical Engineering
      • • Department of Mathematical Engineering and Information Physics
      • • Department of Mechanical Engineering
      Tokyo, Tokyo-to, Japan
  • 2007
    • NTT DATA Corporation
      Edo, Tōkyō, Japan