The Experts below are selected from a list of 37860 Experts worldwide ranked by ideXlab platform
Hideki Hashimoto - One of the best experts on this subject based on the ideXlab platform.
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Enhancement of Spatial Memory using human-object relations
2008 SICE Annual Conference, 2008Co-Authors: Mihoko Niitsuma, Takeshi Sasaki, Hideki HashimotoAbstract:This paper describes enhancement of the Spatial Memory system in order to improve human activities observation. In previous approach, human activities using the Spatial Memory in the real world can be observed, but activities using physical objects can not be observed. Therefore, we will focus on interaction among humans and objects. By attaching small sensor nodes to humanspsila hand and physical objects, the observation will be achieved. In order to realize uniformed methodology for the observation of human activities based on the Spatial Memory, we introduce Object-based Spatial- Knowledge-Tags (O-SKTs). History of human-object interaction is described by using an O-SKT including 4W1H (who, what, when, where and how) information. This paper presents a system to observe human-object interaction and experimental results of the observation.
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Spatial Memory as an aid system for human activity in intelligent space
IEEE Transactions on Industrial Electronics, 2007Co-Authors: Mihoko Niitsuma, Hideki HashimotoAbstract:This paper presents the Spatial Memory that aids human activities in a working environment. The Spatial Memory enables humans to store computerized information into the real world by assigning a 3-D position as the Memory address. By storing computerized information into the real world, users can manipulate the information in similar ways as physical objects. Consequently, we can retrieve stored knowledge by indicating the point using our own arms, which we name "human indicator." This paper shows a prototype of the Spatial Memory system, which has potential to enhance desk work. The implemented system is evaluated through two types of experiments by using human subjects. Experimental results verify the efficiency and the effectiveness of our Spatial Memory framework based on a statistical test
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Spatial Memory for collaboration support system in intelligent space -User identification based on Spatial Memory-
SICE Annual Conference 2007, 2007Co-Authors: Mihiko Niitsuma, Hideki HashimotoAbstract:This paper presents an implementation of the Spatial Memory system for supporting collaboration activity in Intelligent Space. In this paper, a design of the new Spatial Memory system is described based on three requirements for a collaboration system: (1) sharing information for multi-users and multi-terminals, (2) access privileges for SKTs and (3) user identification. User identification method is one of the most important functions for sharing information systems. Therefore, this paper proposes a new user identification method by using the Spatial Memory system. More specifically, users create their own key-Spatial-Knowledge-Tags (SKTs) as passwords to use the Spatial Memory system. The new user identification method is evaluated through user experiments. Experimental results show high effectiveness of the method.
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Spatial Memory an aid system for human activity in intelligent space
International Conference on Robotics and Automation, 2006Co-Authors: Mihoko Niitsuma, Hideki HashimotoAbstract:This paper proposes the Spatial Memory as an interface between human and intelligent space (iSpace). The Spatial Memory regards three-dimensional space as mass storage of computers, i.e. three-dimensional point is treated as an address of stored digital data such as various documents, images and commands for machines. Consequently, we can access stored digital data by indicating a point using our own arms, which we named "human indicator". In this paper, we implement a prototype of the Spatial Memory system which is supposed to utilize digital data regarded as externalized knowledge. The implemented system is evaluated through two types of experiments. The tendency to forget and the efficiency of task performance are investigated. By applying the t-test under the level of significance 5%, experimental results of the performance efficiency show significant statistical difference between the results with the Spatial Memory and without it
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An evaluation of Spatial Memory based on human performance
31st Annual Conference of IEEE Industrial Electronics Society 2005. IECON 2005., 2005Co-Authors: M. Niitsuma, Hiroshi Hashimoto, Hideki HashimotoAbstract:This paper proposes the Spatial Memory which aids human activity in a working environment. The Spatial Memory regards three-dimensional space as mass storage of computers, i.e. three-dimensional point is treated as an address of stored knowledge such as various documents, images and commands for machines. Consequently, we can access a stored knowledge by indicating the point using our own arms, which we named "human indicator". In this paper, we implement a prototype of the Spatial Memory system which is supposed to be utilized for a desk work. The implemented system is evaluated from the viewpoint of human performances.
Hideki Imai - One of the best experts on this subject based on the ideXlab platform.
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protective effect of rutin against Spatial Memory impairment induced by trimethyltin in rats
Nutrition Research, 2008Co-Authors: Tomoko Koda, Yoshiki Kuroda, Hideki ImaiAbstract:Rutin is a flavonoid with various biological activities that are beneficial to human health. Trimethyltin is a toxic organotin compound, and rats injected with trimethyltin serve as a useful in vivo model for studying Spatial Memory impairment and neurodegeneration in the hippocampus. The protective effect of rutin against the trimethyltin-induced Spatial Memory impairment and hippocampal neuron damage in rats was examined. Peroral administration of a single dose of trimethyltin (8.5 mg/kg) induced Spatial Memory loss and the extensive loss of CA3 pyramidal neurons in hippocampi, as indicated by the results of a Morris water maze task and histologic examination, respectively. Prolonged supplementation of rutin significantly reversed the trimethyltin-induced Spatial Memory impairment and the damage to pyramidal neurons in the hippocampal CA3b region, indicating an antioxidative effect of rutin. These results suggest that rutin in the diet may provide a protective effect against Spatial Memory impairment accompanied by hippocampal pyramidal neuron loss.
Jonathan W. Kelly - One of the best experts on this subject based on the ideXlab platform.
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Collaborative inhibition in Spatial Memory retrieval
Memory & Cognition, 2014Co-Authors: Lori A. Sjolund, Matthew R. Erdman, Jonathan W. KellyAbstract:Collaborative inhibition refers to the finding that pairs of people working together to retrieve information from Memory—a collaborative group—often retrieve fewer unique items than do nominal pairs, who retrieve individually but whose performance is pooled. Two experiments were designed to explore whether collaborative inhibition, which has heretofore been studied using traditional Memory stimuli such as word lists, also characterizes Spatial Memory retrieval. In the present study, participants learned a layout of objects and then reconstructed the layout from Memory, either individually or in pairs. The layouts created by collaborative pairs were more accurate than those created by individuals, but less accurate than those of nominal pairs, providing evidence for collaborative inhibition in Spatial Memory retrieval. Collaborative inhibition occurred when participants were allowed to dictate the order of object placement during reconstruction (Exp. 1), and also when object order was imposed by the experimenter (Exp. 2), which was intended to disrupt the retrieval processes of pairs as well as of individuals. Individual tests of perspective taking indicated that the underlying representations of pair members were no different than those of individuals; in all cases, Spatial memories were organized around a reference frame aligned with the studied perspective. These results suggest that inhibition is caused by the product of group recall (i.e., seeing a partner’s object placement), not by the process of group recall (i.e., taking turns choosing an object to place). The present study has implications for how group performance on a collaborative Spatial Memory task may be optimized.
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Head for the hills: The influence of environmental slant on Spatial Memory organization
Psychonomic Bulletin and Review, 2011Co-Authors: Jonathan W. KellyAbstract:Environmental slant is known to improve navi- gation performance in humans and other animals. Success- ful navigation relies on accurate Spatial orientation and accurate Spatial Memory retrieval. The role of environmen- tal slant in Spatial orientation has been established, but its role in Spatial Memory organization is unclear. Two experi- ments using immersive virtual reality explored the influence of environmental slant on reference frame selection during Spatial learning. Participants studied object locations on a sloped surface. When no additional environmental cues were present (Experiment 1), Spatial Memory retrieval was best from the studied perspective aligned with the direction of slope. When the direction of slope was placed in competition with the axis of the surrounding room (Experiment 2), Spatial Memory retrieval was best from the initially studied perspec- tive. The latter finding contrasts with the results of research showing that pigeons preferentially rely on environmental slant over room shape. The findings are discussed in the context of Spatial Memory theory.
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Spatial Cognition - Spatial Memory and Spatial Orientation
Spatial Cognition VI. Learning Reasoning and Talking about Space, 2008Co-Authors: Jonathan W. Kelly, Timothy P. McnamaraAbstract:Navigating through a remembered space depends critically on the ability to stay oriented with respect to the remembered environment and to reorient after becoming lost. This chapter describes the roles of long-term Spatial Memory, sensorimotor Spatial Memory, and path integration in determining Spatial orientation. Experiments presented here highlight the reference direction structure of long-term Spatial Memory and suggest that self-position and orientation during locomotion are updated with respect to those reference directions. These results indicate that a complete account of Spatial orientation requires a more thorough understanding of the interaction between long-term Spatial Memory, sensorimotor Spatial Memory, and path integration.
Carlos A. Zarate - One of the best experts on this subject based on the ideXlab platform.
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Performance on a virtual reality Spatial Memory navigation task in depressed patients
American Journal of Psychiatry, 2007Co-Authors: Neda F. Gould, M. Kathleen Holmes, Bryan D. Fantie, David A. Luckenbaugh, Neil Burgess, Husseini K. Manji, Todd D Gould, Daniel S. Pine, Carlos A. ZarateAbstract:Objective: Findings on Spatial Memory in depression have been inconsistent. A navigation task based on virtual reality may provide a more sensitive and consistent measure of the hippocampal-related Spatial Memory deficits associated with depression. Method: Performance on a novel virtual reality navigation task and a traditional measure of Spatial Memory was assessed in 30 depressed patients (unipolar and bipolar) and 19 normal comparison subjects. Results: Depressed patients performed significantly worse than comparison subjects on the virtual reality task, as assessed by the number of locations found in the virtual town. Between-group differences were not detected on the traditional measure. The navigation task showed high test-retest reliability. Conclusions: Depressed patients performed worse than healthy subjects on a novel Spatial Memory task. Virtual reality navigation may provide a consistent, sensitive measure of cognitive deficits in patients with affective disorders, representing a mechanism to study a putative endophenotype for hippocampal function.
Tomoko Koda - One of the best experts on this subject based on the ideXlab platform.
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protective effect of rutin against Spatial Memory impairment induced by trimethyltin in rats
Nutrition Research, 2008Co-Authors: Tomoko Koda, Yoshiki Kuroda, Hideki ImaiAbstract:Rutin is a flavonoid with various biological activities that are beneficial to human health. Trimethyltin is a toxic organotin compound, and rats injected with trimethyltin serve as a useful in vivo model for studying Spatial Memory impairment and neurodegeneration in the hippocampus. The protective effect of rutin against the trimethyltin-induced Spatial Memory impairment and hippocampal neuron damage in rats was examined. Peroral administration of a single dose of trimethyltin (8.5 mg/kg) induced Spatial Memory loss and the extensive loss of CA3 pyramidal neurons in hippocampi, as indicated by the results of a Morris water maze task and histologic examination, respectively. Prolonged supplementation of rutin significantly reversed the trimethyltin-induced Spatial Memory impairment and the damage to pyramidal neurons in the hippocampal CA3b region, indicating an antioxidative effect of rutin. These results suggest that rutin in the diet may provide a protective effect against Spatial Memory impairment accompanied by hippocampal pyramidal neuron loss.
