研究者詳細 - 大平　英樹

論文 - 大平　英樹

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Temporal variation of acute stress responses in sympathetic nervous and immune systems

Kimura K, Isowa T, Ohira H, Murashima S

BIOLOGICAL PSYCHOLOGY 70 巻 ( 2 ) 頁： 131 - 139 2005年10月

Temporal variation of acute stress responses in sympathetic nervous and immune systems 査読有り

K Kimura, T Isowa, H Ohira, S Murashima

BIOLOGICAL PSYCHOLOGY 70 巻 ( 2 ) 頁： 131 - 139 2005年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE BV

Sympathetic nervous activity plays a prominent role in acute stress responses in the immune system, enhancement of innate immunity and suppression of specific immunity. The present study was conducted to examine the temporal characteristics of such immune responses to acute stress and to determine their association with sympathetic activity in detail. For this purpose, 15 female undergraduates engaged in a continuous mental arithmetic task for 14 min, and we collected their blood samples for immune indices (CD3+ T cells, CD4+ T cells, NK cells) each 3 min during the task and saliva samples before and after the task. Our results showed that the proportion of Natural Killer cells (NK cells) increased even 2 min after initiation of the task, whereas proportions of CD3+ and CD4+ lymphocytes decreased 8 min after initiation of the task. Moreover, we found significant correlations between cardiovascular activity and the variations of immune indices. (c) 2005 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.biopsycho.2004.12.006

Web of Science

Neural evidence of effects of emotional valence on word recognition. 査読有り国際誌

Midori Inaba, Michio Nomura, Hideki Ohira

International journal of psychophysiology : official journal of the International Organization of Psychophysiology 57 巻 ( 3 ) 頁： 165 - 73 2005年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

There are no clear reports of electrophysiological evidence of the facilitating effect of negative valence on word recognition. However, behavioral psychological studies have suggested that negative words can be recognized more accurately than positive and neutral words. This study aimed to examine whether, and if so how, the valence of words could influence accuracy and event-related potentials (ERPs) in a recognition task. ERPs were recorded from 20 healthy subjects during performance of a word recognition task. We found a behavioral advantage in discriminability between old and new items for negative words. As for ERPs, the positive-going shift was evident for correct responses to targets in late latency at midline and left centro-parietal sites. Additionally, the magnitude of this component was greatest for negative targets, next for positive targets, and least for neutral targets. The findings offer support for the idea that negative content greatly accelerates recognition memory compared to positive and neutral words.

PubMed

Neural evidence of effects of emotional valence on word recognition

Inaba M, Nomura M, Ohira H

INTERNATIONAL JOURNAL OF PSYCHOPHYSIOLOGY 57 巻 ( 3 ) 頁： 165 - 173 2005年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：International Journal of Psychophysiology

DOI： 10.1016/j.ijpsycho.2005.01.002

Web of Science

Scopus

PubMed

Effects of value and reward magnitude on feedback negativity and P300 査読有り

A Sato, A Yasuda, H Ohira, K Miyawaki, M Nishikawa, H Kumano, TL Kuboki

NEUROREPORT 16 巻 ( 4 ) 頁： 407 - 411 2005年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：LIPPINCOTT WILLIAMS & WILKINS

Feedback negativity is a negative component of the event-related brain potential observed 250-300 ms after feedback stimuli. The present study investigated the effects of value (correct or incorrect) and reward magnitude (no, small or large) on feedback negativity and P300. Feedback negativity was larger after incorrect feedback than after correct feedback, irrespective of reward magnitude. In contrast, P300 amplitude increased with reward magnitude, irrespective of value. The amplitude of feedback negativity was correlated with a trait score of negative affect and not positive affect, whereas P300 amplitude was correlated with positive affect and not negative affect. These results suggest that value and reward magnitude are processed separately in the brain. (c) 2005 Lippincott Williams F Wilkins.

Web of Science

Temporal variation of acute stress responses in sympathetic nervous and immune systems. 査読有り

Kimura, K., Isowa, T., Ohira, H.

Biological psychology 70 巻頁： 131-139 2005年

Effects of value and reward magnitude on feedback negativity and P300. 査読有り

Sato, A., Yasuda, A., Ohira, H., Miyawaki, K., Nishikawa, M., Kumano, H., Kuboki, T.

Neuroreport 16 巻頁： 407-411 2005年

Dissociation of conscious and unconscious repetition priming effects on event-related potentials. 査読有り

Matsumoto, A., Iidaka, T., Nomura, M., Ohira H.

Neuropsychologia 43 巻頁： 1168-1176 2005年

Neural evidence of effects of emotional valence on word recognition. 査読有り

Inaba, M., Nomura, M., Ohira, H.

International Journal of Psychophysiology 57 巻頁： 165-173 2005年

Immune, endocrine and cardiovascular responses to controllable and uncontrollable acute stress. 査読有り

Isowa T, Ohira H, Murashima M.

Biological Psychology 71 巻頁： 202-213 2005年

記述言語：英語掲載種別：研究論文（学術雑誌）

Innate immune cells such as natural killer increase and acquired immune cells such as T cells decrease accompanying acute stress (redistribution of lymphocytes). This study examined effects of controllability of an acute stressor on the redistribution of lymphocytes. It was clarified that redistribution is suppressed in an uncontrollable situation. We further clarified mediating mechanisms of the phenomena and discussed significance of the phenomena in adaptation.

外的手がかりが閾下提示された顔表情の判断に及ぼす影響査読有り

野村理朗・宮腰誠・金山範明・大平英樹

人間環境学研究 3 巻頁： 1-5 2005年

社会的認知とストレス招待有り

大平英樹

ストレス科学 19 巻頁： 38-48 2005年

社会的認知とストレス招待有り

大平英樹

ストレス科学 19 巻頁： 38-48 2005年

社会的認知とストレス

大平英樹

ストレス科学 19 頁： 38 - 48 2005年

社会的認知とストレス

大平英樹

ストレス科学 19 頁： 38 - 48 2005年

外的手がかりが閾下提示された顔表情の判断に及ぼす影響

野村理朗, 宮腰誠, 金山範明, 大平英樹

人間環境学研究 3 巻 ( 1 ) 頁： 1 - 5 2005年

外的手がかりが閾下提示された顔表情の判断に及ぼす影響査読有り

野村理朗, 宮腰誠, 金山範明, 大平英樹

人間環境学研究 3 巻頁： 1-5 2005年

Immune, endocrine and cardiovascular responses to controllable and uncontrollable acute stress. 査読有り

Isowa T, Ohira H, Murashima M

Biological Psychology 71 巻頁： 202-213 2005年

記述言語：英語掲載種別：研究論文（学術雑誌）

急性ストレスに伴い，natural killerなどの自然免疫系細胞の増加，T細胞などの獲得免疫系細胞の減少という一過性の現象が生じる（リンパ球再分布）．本研究は，認知的課題による急性ストレス課題において統制可能性を操作し，リンパ球再分布を含む生理的ストレス反応が統制不可能な場合には抑制されることを示し，その媒介メカニズムや適応的意義について論じた．

Dissociation of conscious and unconscious repetition priming effect on event-related potentials.

Matsumoto A, Iidaka T, Nomura M, Ohira H

Neuropsychologia 43 巻 ( 8 ) 頁： 1168 - 76 2005年

Dissociation of conscious and unconscious repetition priming effect on event-related potentials 査読有り

A Matsumoto, T Iidaka, M Nomura, H Ohira

NEUROPSYCHOLOGIA 43 巻 ( 8 ) 頁： 1168 - 1176 2005年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Although the neural basis of the unconscious priming effect has previously been investigated, the results of these studies have possibly been contaminated by a conscious priming effect. The aim of the present study was to dissociate the effects of conscious and unconscious priming on event-related potential (ERP) by using the process-dissociation procedure. A prime word was presented briefly, followed by a word-stem, in each trial. Under the inclusion condition, subjects were instructed to complete the word-stem using the prime word, while under the exclusion condition subjects were asked to complete the word-stem with a word not seen as prime. The behavioral priming effect was obtained under both conditions, indicating that the prime words were processed unconsciously and influenced the word-stem completion task. We found that two ERP components were affected by repetition priming. First, the N400 amplitude was decreased by word repetition under the inclusion condition, but not under the exclusion condition. This result suggests that N400 would reflect conscious lexical processing, but not unconscious lexical activation. Second, the negativity at left front lateral region was enhanced by word repetition under the exclusion condition. We discuss this finding herein in relation to the activity of the left inferior prefrontal cortex with regard to word semantic processing. (c) 2004 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.neuropsychologia.2004.11.020

Web of Science

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