研究者詳細 - 我妻　広明

論文 - 我妻　広明

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Cultivated microorganisms control a real robot: A model of dynamical coupling between internal growth and robot movement 査読有り国際誌

Wagatsuma H.

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 5506 LNCS ( PART 1 ) 1087 - 1094 2009年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In biological systems, internal microorganisms adaptively survive but often serve necessary functions to the host, such as energy production by mitochondria as symbiosis. On the other hand, malignant germs have a parasitic relationship with the host and provide no benefit. A significant property that distinguishes healthy symbioses and malignant parasites is reproduction speed, or pace. For example, the rapid reproduction of influenza viruses destructs the host system, resulting in death. This study explored the necessary temporal property to establish a healthy relationship with the host under conditions where internal organisms have individual life spans. We propose a simple model of microorganisms, which are distributed spatially as colonial organizations undergoing temporal evolution and hypothesize that a self-consistent rhythm generated in collective behavior that is functionally coupled with the temporal global property of the host system is critical. To investigate the real-time coordination capability, an experimental framework with a mobile robot moving in the real world was used. As the on-line system, the microorganism model controls this robot. In this model, microorganisms expanded spatially and had colonial and power law distributions through time evolution. The neighboring distances, which are crucial for reproduction speed and are globally modulated by the size of the whole living area, are plastically changed to exhibit a rhythmic modulation. In the real-environmental experiment, the robot's navigation was successfully demonstrated by producing a temporal adaptability of microorganisms with the living area reshaped according to the current sensory information of the mobile robot. This is a first step of the microorganism-based framework to investigate the real-time coordination mechanism between internal and external timescales. The result may further groundbreaking research of bio-morphological robots. © 2009 Springer Berlin Heidelberg.

DOI： 10.1007/978-3-642-02490-0_132

Scopus

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Hybrid design principles and time constants in the construction of Brain-based robotics: A real-time simulator of oscillatory neural networks interacting with the real environment via robotic devices 査読有り国際誌

Wagatsuma H.

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 5506 LNCS ( PART 1 ) 119 - 126 2009年09月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

One of most important concepts in robotics and artificial intelligence is the embodied approach, focusing on the importance of having a body that functionally connects to the external world. This setup suggests that the intelligence develops through sensorimotor skills and through situations that would actually be confronted in the environment. We support this concept and propose to further extend it to embodiment in the time domain. Nervous systems have variable processing times. The different time courses proceed in the nervous system in parallel, and individual circuits independently and cooperatively work under the constraints of temporal properties. We here propose an experimental platform of oscillatory neural networks having real-time communication with the environment through the robot's body. The synchronization mechanism of oscillations in neural activities have the advantage of synthetic controls known in motor coordination, but we extend this to circuits for cognitive functions like episodic memory formation and decision making of the robotic behavior by using the theta phase coding mechanism. A slow oscillation, like the theta rhythm, enables behavioral temporal sequences to be compressed in sequential firings during each oscillation cycle, and this helps to represent cognitive information in episodes composed of past-present-future structures. The temporal structure is crucial for recognition of the current context and adaptability in dynamic environments, and it smoothly controls sensorimotor local circuits with faster time scales. This work represents a tiny step towards constructing the brain by focusing on the temporal structure, yet this approach may elucidate the new nature of the brain-based intelligence. © 2009 Springer Berlin Heidelberg.

DOI： 10.1007/978-3-642-02490-0_15

Scopus

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Context-dependent adaptive behavior generated in the theta phase coding network 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y.

Lecture Notes in Computer Science 4985 117 - 184 2008年12月

Working memory dynamics in a flip-flop oscillation network model with milnor attractor 査読有り国際誌

Colliaux, D., Yamaguchi, Y., Molter, C., Wagatsuma, H

Lecture Notes in Computer Science 4984 151 - 159 2008年12月

A computational model of formation of grid field and theta phase precession in the entorhinal cells 査読有り国際誌

Yamaguchi, Y., Molter, C., Wu, Z., Agashe, H. A., Wagatsuma, H.

Lecture Notes in Computer Science 4984 160 - 169 2008年12月

Working memory dynamics in a flip-flop oscillations network model with milnor attractor 査読有り国際誌

Colliaux D., Yamaguchi Y., Molter C., Wagatsuma H.

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 4984 LNCS ( PART 1 ) 160 - 169 2008年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A phenomenological model is developed where complex dynamics are the correlate of spatiooral memories. If resting is not a classical fixed point attractor but a Milnor attractor, multiple oscillations appear in the dynamics of a coupled system. This model can be helpful for describing brain activity in terms of well classified dynamics and for implementing human-like real-time computation. © 2008 Springer-Verlag Berlin Heidelberg.

DOI： 10.1007/978-3-540-69158-7_18

Scopus

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A computational model of formation of grid field and theta phase precession in the entorhinal cells 査読有り国際誌

Yamaguchi Y., Molter C., Zhihua W., Agashe H., Wagatsuma H.

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 4984 LNCS ( PART 1 ) 151 - 159 2008年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This paper proposes a computational model of spatiooral property formation in the entorhinal neurons recently known as "grid cells". The model consists of module structures for local path integration, multiple sensory integration and for theta phase coding of grid fields. Theta phase precession naturally encodes the spatial information in theta phase. The proposed module structures have good agreement with head direction cells and grid cells in the entorhinal cortex. The functional role of theta phase coding in the entorhinal cortex for cognitive map formation in the hippocampus is discussed. © 2008 Springer-Verlag Berlin Heidelberg.

DOI： 10.1007/978-3-540-69158-7_17

Scopus

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Context-dependent adaptive behavior generated in the theta phase coding network 査読有り国際誌

Wagatsuma H., Yamaguchi Y.

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 4985 LNCS ( PART 2 ) 177 - 184 2008年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The real world changes in space over time. Our brains need real-time interaction with the external world and will update various internal representations even when events happen only one-time. Such one-time experiences are evaluated in relation to what happens for us in joy and sorrow. Recent brain studies suggest that the dynamic coordination of different representations in brain areas is governed by the synchronization of the brain oscillation, such as theta rhythms. In the rodent hippocampus, the temporal coding mechanism with the theta rhythm, theta phase coding, provides the ability to encode and retrieve behavioral sequences even in the one-time experience, by using successive firing phases in every theta cycle. We here extended the theory to the large-scale brain network and hypothesized that the phase coding not only represents the current behavioral context, but also properly associates it with the evaluation of what happened in the external environment. It is necessary for the animal to predict events in the near future and to update the current and next executive action. In a maze task on our robotic platform, the acquisition of spatial-temporal sequences and spatial-reward associations were demonstrated, even in few trials, and the association contributes to the current action selection. This result suggests that theta rhythms may contribute to coordinate different neural activities to enable contextual decision-making in the real environment. © 2008 Springer-Verlag Berlin Heidelberg.

DOI： 10.1007/978-3-540-69162-4_19

Scopus

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Design of Web Agents Inspired by Brain Research 査読有り国際誌

Dimitrova, M., Wagatsuma, H., Yamaguchi, Y

Proceedings of 11th European Conference on Advances in Databases and Information Systems (ADBIS 2007), In Y. Ioannidis, B. Novikov and B. Rachev (Eds.) 17 - 26 2007年12月

Design of Web agents inspired by brain research 査読有り国際誌

Dimitrova M., Wagatsuma H., Yamaguchi Y.

CEUR Workshop Proceedings 325 17 - 26 2007年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The paper presents an approach to combine knowledge from memory and brain sciences with information retrieval research in the design of Web agents. An information retrieval agent for classification of Web pages based on genre features is used. In developing the agent to adapt to users' search preferences, a neuro-cognitive model of human episodic memory is employed. Our studies show that neuro-realistic models, capable of abstraction of meaningful fragments of knowledge, rather than snapshots of the retrieved Web pages, are closer to the human way of interacting with the Web and can be used for optimization of agent performance. © Technical University of Varna, 2007.

Scopus

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Neural computation of the grid field and theta phase precession from head direction system in the entorhinal cortex, 査読有り国際誌

Yamaguchi, Y., Molter, C., Wagatsuma, H., Wu, Z.

37th Annual Meeting of Society for Neuroscience (SFN 2007) 2007年11月

Contextual decision-making in the hippocampal-amygdala-prefrontal network mediated by theta rhythms in a spatial memory task: a study of the neuro-robotics platform by using theta phase coding 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y.

37th Annual Meeting of Society for Neuroscience (SFN 2007) 2007年11月

A unified view of theta-phase coding in the entorhinal-hippocampal system 査読有り国際誌

Yamaguchi, Y., Sato, N., Wagatsuma, H., Wu, Z., Molter, C., Aota, Y

Current Opinion in Neurobiology 17 ( 2 ) 1 - 8 2007年06月

Neural Dynamics of the Cognitive Map in the Hippocampus 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y.

Cognitive Neurodynamics 1 ( 2 ) 1871 - 4080 2007年06月

Disambiguation in spatial navigation with theta phase coding 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y

Neurocomputing 69 ( Issues 10-12 ) 1228 - 1232 2006年12月

Real-time encoding of cognitive maps in multiple environments enabled by a hippocampal network model with theta phase precession and two way synaptic plasticity competition 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y.

36th Annual Meeting of Society for Neuroscience (SFN 2006) 2006年10月

Memory guided locomotion with spatial ambiguity: behavioral context representation by theta phase coding in the hippocampus 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y.

35th Annual Meeting of Society for Neuroscience (SFN 2005) 2005年11月

Disambiguation in spatial navigation with theta phase coding 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y.

The international Computational Neuroscience Meeting (CNS*2005) 2005年07月

海馬シータ位相コードによる場所の曖昧性を含む異なるエピソードの学習査読有り

我妻広明, 山口陽子

日本神経回路学会誌 12 ( 1 ) 17 - 31 2005年03月

Cognitive map formation through sequence encoding by theta phase precession. 査読有り国際誌

Wagatsuma, H., Yamaguchi, Y

Neural Computation 16 ( 12 ) 2665 - 2697 2004年12月

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