Details of a Researcher - UMEDA Satoshi

Papers - UMEDA Satoshi

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SIGVerse:身体的認知・運動を伴う社会エージェントのためのシミュレータープラットフォーム

稲邑哲也, 柴田智広, 瀬名秀明, 橋本敬, 川合伸幸, 宮下敬宏, 櫻井圭記, 清水正宏, 大武美保子, 細田耕, 梅田聡, 乾健太郎

人工知能学会全国大会論文集(CD-ROM) (一般社団法人人工知能学会) 23rd ( 0 ) ROMBUNNO.2I2-1 - 2I21 2009

ISSN 1347-9881

従来までに，社会エージェントシステムを用いて経済や言語進化などのシミュレーションが実現されてきている．一方で，ロボティクスでは物理法則に基づく運動や，視聴覚等のセンシングのシミュレーションに基づいて知能行動の研究が行われている．本稿ではこの双方のシミュレーションを同時に実行可能なシステムを構築し，人間とロボットエージェント間の身体性認知・運動を考慮した社会的知能の研究プラットフォームを提案する

CiNii Research

Subliminal cuing effects on prospective memory

Teruo Hashimoto, Satoshi Umeda, Shozo Kojima

NEUROSCIENCE RESEARCH 65 S115 - S115 2009

ISSN 0168-0102

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Cognitive Science and Brain Research : Past and Future

UMEDA Satoshi

認知科学 = Cognitive studies : bulletin of the Japanese Cognitive Science Society 15 ( 2 ) 231 - 232 2008.06

ISSN 1341-7924

CiNii Research

Preserved priming but insensitivity to perceptual fluency on recognition judgments in Alzheimer's disease

Yano Madoka, Umeda Satoshi, Mimura Masaru

Psychogeriatrics 8 ( 4 ) 178 - 187 2008

ISSN 1346-3500

Background: Previous research on Alzheimer's disease (AD) has not yielded a consensus regarding the preservation of automatic memory processes, although there is a consensus that conscious recollection processes are impaired in AD. Methods: In the present study, we examined perceptual specificity effects (PSEs) in word recognition judgments (explicit memory task; Experiment 1) and word fragment completion (implicit memory task; Experiment 2) performed by individuals with mild AD and elderly adults without dementia (controls). Results: In recognition judgments, control subjects, but not individuals with AD, demonstrated PSEs (Experiment 1). In contrast, neither group showed PSEs on word fragment completion and their priming magnitudes were comparable (Experiment 2). Conclusions: The findings suggest that perceptually automatic processes in explicit memory judgments and implicit memory processes are different and that the former are specifically impaired in AD. © 2008 The Author Journal compilation © 2008 The Japanese Psychogeriatric Society.

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Medial prefrontal functions in advanced emotion learning: A functional MRI study

Satoshi Umeda, Motoichiro Kato, Seiji Ogawa

NEUROSCIENCE RESEARCH 61 S277 - S277 2008

ISSN 0168-0102

Unilateral amygdala lesions hamper attentional orienting triggered by gaze direction

Akiyama Tomoko, Kato Motoichiro, Muramatsu Taro, Umeda Satoshi, Saito Fumie, Kashima Haruo

Cerebral Cortex 17 ( 11 ) 2593 - 2600 2007.11

ISSN 1047-3211

The newly discovered deficit in a bilateral amygdala-damaged case, of not being able to allocate attention to the critical feature of a face (Adolphs R, Gosselin F, Buchanan TW, Tranel D, Schyns P, Damasio AR. 2005. A mechanism for impaired fear recognition after amygdala damage. Nature. 433:68 - 72.), has opened a new window into the function of the amygdala. This case implies that the amygdala might be essential in detecting potentially relevant social stimuli, and directing attention accordingly. In this study, we have sought to test this implication by investigating the behavioral performance of 5 unilateral amygdala-damaged subjects on spatial cueing tasks. The tasks employed central gaze and arrow direction as cues to trigger attentional orienting in peripheral target detection. Although age-matched normal controls demonstrated a significant congruency effect such that targets presented congruently to cue direction elicited faster detection, amygdala subjects demonstrated no such congruency effect for gaze cues in the face of a significant congruency effect for arrow cues. The results suggest that the social valence of a stimulus is critical for amygdala involvement in visual processing. The results also support the implicated role of the amygdala in detecting and analyzing relevant social stimuli, and orienting attention accordingly. © The Author 2007. Published by Oxford University Press. All rights reserved.

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Altered brain activation by a false recognition task in young abstinent patients with alcohol dependence

Akine Yoshihide, Kato Motoichiro, Muramatsu Taro, Umeda Satoshi, Mimura Masaru, Asai Yoshiyuki, Tanada Shuji, Obata Takayuki, Ikehira Hiroo, Kashima Haruo, Suhara Tetsuya

Alcoholism: Clinical and Experimental Research 31 ( 9 ) 1589 - 1597 2007.09

ISSN 0145-6008

Background: Heavy alcohol intake induces both structural and functional changes in the central nervous system. Recent research developments converged on the idea that even in patients with alcohol dependence without apparent structural brain changes, some cognitive impairment exists, and associated functional change could be visualized by neuroimaging techniques. However, these data were from old (more than 50 years) patients using working memory and response inhibition tasks. Whether young abstinent patients show aberrant signs of brain activation is a matter of interest, specifically by the long-term memory retrieval task. Methods: Subjects were 9 young patients with alcohol dependence with long-term abstinent (8 males and 1 female) and age- and education-matched 9 healthy controls (7 males and 2 females). We used a modified false recognition task in a functional MRI study. Results: The young patients with alcohol dependence showed reduced activation in the right dorsolateral prefrontal cortex, anterior cingulate cortex (ACC), left pulvinar in the thalamus, and in the right ventral striatum, although behavioral performances and regional patterns of brain activation were similar between patients and controls. Conclusions: Long-term memory retrieval induced altered activations in prefrontal lobes, ACC, thalamus, and ventral striatum in young patients with alcohol dependence. These findings were correspondent to deficits of goal directed behavior, monitoring the erroneous responses, memory function, and drug-seeking behavior. Furthermore, these reduced activations can be considered as latent "lesions," suggesting subclinical pathology in alcoholic brains. © 2007 by the Research Society on Alcoholism.

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Neural Substrates of Advanced Emotion Learning.

Umeda Satoshi, Kuroki Chihiro, KATOU MOTOICHIROU, Seiji Ogawa

小川脳機能研究所年報 Annual Report 2007 6-9 2007

顔検出過程(face detection)の神経基盤に関するfunctional MRI研究

KATOU MOTOICHIROU

小川脳機能研究所年報 Annual Report 2007 10-11 2007

Gaze but not arrows

Akiyama Tomoko, Kato Motoichiro, Muramatsu Taro, Saito Fumie, Umeda Satoshi, Kashima Haruo

Neuropsychologia 44 ( 10 ) 1804 - 1810 2006

ISSN 0028-3932

Superior temporal sulcus (STS) activation has consistently been demonstrated in the normal brain when viewing eyes, and thus this area is implicated as a gaze processing region in humans. In a recent report, we have presented a case, M.J., with a well-circumscribed lesion to the right superior temporal gyrus (STG), who demonstrated impaired discrimination of gaze direction. In the aim to make distinct whether this impairment is unique to gaze, we have applied a spatial cueing paradigm established by Kingstone and colleagues. In our experiment, pictorial gaze and symmetrical arrows were centrally presented as non-predictive, spatial cues in detecting peripheral targets. Fifteen normal subjects and M.J. participated in the experiment. In concordance with previous reports, controls demonstrated a significant facilitation of reaction times in detecting targets cued by congruent gaze/arrows, compared with incongruent cues. In striking contrast, M.J. showed no such congruency advantage for gaze, in the face of a normal congruency advantage for arrows. We have demonstrated that a circumscribed lesion to the right STG impairs the ability to utilize biological directional information such as gaze, but leaves the non-biological counterpart (arrows) intact. This dissociation implies that indeed, the STS specializes in processing gaze. © 2006 Elsevier Ltd. All rights reserved.

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Dissociative contributions of medial temporal and frontal regions to prospective remembering

Umeda Satoshi, Nagumo Yumi, Kato Motoichiro

Reviews in the Neurosciences 17 ( 1-2 ) 267 - 278 2006

ISSN 0334-1763

Prospective memory is memory of future intentions or plans in everyday life. Although some previous neuropsychological studies have stated that the prefrontal cortex and the medial temporal lobe are essential for successful prospective remembering, how the two regions contribute to prospective remembering remains unclear. We therefore used prospective memory training in the present study to investigate the neural mechanism of two components of prospective remembering: remembering to remember and remembering content. Two brain-damaged patients participated in this study: patient Y.O., who had lesions in the medial temporal lobe bilaterally, and patient T.K., who had a lesion in the basal forebrain and right medial frontal lobe. Both participants exhibited a severe antero-grade amnesic syndrome and had normal IQ scores. Before the prospective memory training the participants underwent several index memory tests to examine their general memory and prospective memory performance. The training consisted of requesting the participants to perform an original mini-day task, in which they were first asked to memorize five simple daily actions with their times for execution, and then to recall the content of the actions when shown a drawing of a clock showing the proper time for execution. A training session was carried out once a week for 3 months. After completing training, the participants were again requested to take the same index memory tests. The results of the training task showed that Y.O.'s memory performance had gradually improved across all sessions of training, but T.K.'s improvement was not as marked. A more detailed analysis revealed that Y.O.'s memory performance was better for recalling time than for recalling content, whereas T.K.'s memory performance was better for recalling content than for recalling time. Furthermore, the results of the final index memory tests showed that the only improvement in Y.O.'s prospective memory was in remembering to remember, and that the only improvement in T.K.'s prospective memory was in remembering content. These results provide strong evidence that these two remembering components of prospective memory have independent neural bases, with the basal forebrain and right medial frontal lobe being required for remembering to remember, and the medial temporal lobe being required for remembering content. The results also suggest that memory training is an effective, means of improving everyday memory. © Freund & Pettman.

心の理論 (特集前頭前野機能の最前線--基礎から臨床まで)

大泉郷子, 梅田聡, 三村將

神経研究の進歩 (医学書院) 49 ( 4 ) 599 - 607 2005.08

ISSN 0001-8724

Functional network in the prefrontal cortex during episodic memory retrieval

Umeda Satoshi, Akine Yoshihide, Kato Motoichiro, Muramatsu Taro, Mimura Masaru, Kandatsu Susumu, Tanada Shuji, Obata Takayuki, Ikehira Hiroo, Suhara Tetsuya

NeuroImage 26 ( 3 ) 932 - 940 2005.07

ISSN 1053-8119

A recent consistent finding in neuroimaging studies of human memory is that the prefrontal cortex (PFC) is activated during episodic memory retrieval. To date, however, there has been no direct evidence to explain how activity in the right and left PFC and in the anterior and posterior PFC are functionally interconnected. The goal of the present study was to obtain such evidence by event-related functional magnetic resonance imaging (MRI) and the functional connectivity method. Subjects were first asked to try to remember a series of associate-word lists outside the MRI scanner in preparation for a later recognition test. In the MRI scanning phase, they were asked to make recognition judgments in regard to old words, semantically related lure words, and unrelated new words. The analysis of functional connectivity revealed that the posterior PFC in each hemisphere had strong functional interconnections with the contralateral posterior PFC, whereas the anterior PFC in each hemisphere had only weak functional interconnections with the contralateral anterior PFC. No strong functional interconnections were found between the anterior and posterior PFC in either hemisphere. These findings support the hypothesis of an associative contribution of the bilateral posterior PFC to episodic memory retrieval and a dissociative contribution of the bilateral anterior PFC. © 2005 Elsevier Inc. All rights reserved.