著者

飯島 淳彦

出版者

一般社団法人 日本めまい平衡医学会

雑誌

Equilibrium Research (ISSN:03855716)

巻号頁・発行日

vol.71, no.3, pp.194-199, 2012 (Released:2012-08-01)

参考文献数

10

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Audio-visual technological innovation has drastically changed our visual environments. Our visual system receives an overload of visual information in our daily lives. Visual stimuli, especially unsteady video images taken with shaking hands can induce motion sickness and cause nausea and headache as autonomic dysfunctions. We analyzed autonomic functions such as pupillary responses, heart rate, and blood pressure during movie presentations. Sympathetic hyperactivity was observed in the affected subjects. Pupillary responses signify autonomic activities clearly with non-invasive methods. We applied pupillometry for evaluation of stressed subjects and diagnosis of neurological diseases. We observed parasympathetic nervous dysfunction in those subjects. Evaluations of the relationship between visual and autonomic functions could be a potential marker for understanding the visual-autonomic systems.

著者

飯島 淳彦 小杉 剛 木竜 徹 松木 広介 長谷川 功 板東 武彦

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.49, no.6, pp.946-951, 2011-12-10 (Released:2012-04-10)

参考文献数

9

被引用文献数

3

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We investigated an effective method for evaluating chronic stress in humans by using pupillary responses to visual motion stimuli. Nine subjects watched movies including 18 short video movies (duration:10s in each). The pupil diameter responding to the movies were measured with a video oculography and calculated the difference between the maximum and minimum pupil diameters responded to the stimuli was highly correlated with the salivary α-amylase (R=-0.76, p=0.018) activities. The sympathetic nervous system is activated by a stress and secretes the salivary amylase. We found that there were some autonomic different responses in the stress subject from pupillary and salivary observations. These phenomena were clearly observed under the visual movie stimulation which was able to reveal the steady pupillary responses.

著者

蘇日塔拉図 外山 寛 小杉 剛 木竜 徹 林 豊彦 飯島 淳彦 前田 義信 山崎 健

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.48, no.1, pp.98-105, 2010-02-10 (Released:2010-11-17)

参考文献数

17

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Visually induced motion sickness is one of the detrimental effects of video images on human psychosomatic state. Several studies for alleviating this effect have been cumulated in recent years. One of the studies reported that people with high heart rate tended to be immune to the motion sickness. This fact motivated us to assume that the increase of subjects' heart rate through physical exercise before video watching could prevent them from the motion sickness. Then we investigated the effects of video exposure with such pre-exercise on the motion sickness. First we recorded psychosomatic state of 23 volunteers using the simulator sickness questionnaire (SSQ) before and after watching extremely unpleasant video images of a mountain-bike ride capable of visually inducing motion sickness. Then we classified them into nausea and non-nausea groups, based on SSQ evaluation. Subjects' heart rate in nausea group increased gradually during video exposure, while that in non-nausea group was nearly constant. By imposing a 5-minute pre-exercise on 12 subjects in nausea group before video exposure, 10 subjects became immune to the motion sickness, demonstrating that the pre-exercise would be efficient for alleviating the motion sickness. In addition subjects' heart rate in nausea group remained at a higher level during video exposure than at rest, whereas it returned to the rest level immediately after the pre-excise without video exposure.

著者

野村 恵里 木竜 徹 中村 亨弥 飯島 淳彦 板東 武彦

出版者

電子情報通信学会

雑誌

電子情報通信学会論文誌. D, 情報・システム = The IEICE transactions on information and systems (Japanese edition) (ISSN:18804535)

巻号頁・発行日

vol.89, no.3, pp.576-583, 2006-03-01

参考文献数

17

被引用文献数

14

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映像技術が目覚しく発展する一方で,映像酔い等,生体への影響が懸念されており,原因の解明と評価手法の確立が望まれている.本研究では生体影響の中でも特に映像酔いに注目し,生体情報と映像情報との関係から生体に影響を与えていると予想される特徴を動きベクトルで定量的に評価することを目的とした.まず生体信号から,設定した条件に当てはまる生体影響区間を定め,影響を受けたと想定されるトリガ時刻を定義した.その後,トリガ時刻近傍における映像の動きベクトルの時間周波数構造を調べ,単純類似度による評価を行った.更に,動きベクトルからシミュレーション映像(ランダムドットパターン)を制作し,実写映像との比較を行った.その結果,トリガ時刻での時間周波数構造は特定の成分をもち,0.3〜2.5Hzの周波数帯域に0.5以上の規格化パワーをもつ動きベクトルが生体に影響を与えている可能性が示唆された.

著者

蘇日 塔拉図 外山 寛 小杉 剛 木竜 徹 林 豊彦 飯島 淳彦 前田 義信 山崎 健

出版者

一般社団法人 日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.48, no.1, pp.98-105, 2010-02-10

参考文献数

17

被引用文献数

2

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Visually induced motion sickness is one of the detrimental effects of video images on human psychosomatic state. Several studies for alleviating this effect have been cumulated in recent years. One of the studies reported that people with high heart rate tended to be immune to the motion sickness. This fact motivated us to assume that the increase of subjects' heart rate through physical exercise before video watching could prevent them from the motion sickness. Then we investigated the effects of video exposure with such pre-exercise on the motion sickness. First we recorded psychosomatic state of 23 volunteers using the simulator sickness questionnaire (SSQ) before and after watching extremely unpleasant video images of a mountain-bike ride capable of visually inducing motion sickness. Then we classified them into nausea and non-nausea groups, based on SSQ evaluation. Subjects' heart rate in nausea group increased gradually during video exposure, while that in non-nausea group was nearly constant. By imposing a 5-minute pre-exercise on 12 subjects in nausea group before video exposure, 10 subjects became immune to the motion sickness, demonstrating that the pre-exercise would be efficient for alleviating the motion sickness. In addition subjects' heart rate in nausea group remained at a higher level during video exposure than at rest, whereas it returned to the rest level immediately after the pre-excise without video exposure.

著者

飯島 淳彦 岩田 裕 畠野 雄也 藤澤 信義 長谷川 功

出版者

日本霊長類学会

雑誌

霊長類研究 Supplement

巻号頁・発行日

vol.28, 2012

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目的<br>ニホンザルにおいて2要素の組み合わせからなる複合図形と物体との関係を学習させ,それに基づいて複合図形の分解ができるかを調査した.また,物体のカテゴリー化を要素図形による複合図形の組み立てタスクによって回答できるかについても調査した.<br><br>方法<br>2頭のニホンザル(<i>Macaca fuscata</i>)に6組の複合図形と物体との関係を学習させた(Paired Association Training:PA).複合図形は物体とは無関係の6つの要素図形の中の2つで構成した.PAを十分に学習したのち,物体をcueとして呈示し,choiceで複合図形そのものではなく要素図形を4つ呈示し,正しい2つを選択させるテストを行った(Articulation Test:AT).更に,6組の複合図形-物体に対して,物体と同一カテゴリーの図形を順次加え,一組に7種類の図形を用いてカテゴリーを形成し,そのカテゴリーが汎化するかを,probe test としてtrial unique刺激を用いてATで検証した.<br>結果<br>PAを十分に学習した後のATのfirst trialは,2頭の平均正答率が62.3%で,16.7%のchance levelに比べて有意に正答を示した.また,trial unique刺激を用いてカテゴリーの汎化力を調べた結果,Probe trial(p =3.2*10^-15, binominal test),Prototype trial(p =1.6*10^-14)でともにchance levelの16.7%を有意に上回る成績だった.<br>考察・結論ニホンザルにおいて,基本セットの学習を行えば,それをもとに要素図形から複合図形を構成できることが分かった.これはcueとして与えられた物体画像を見ることが,対応する複合図形を見なくてもそれを想起させ,そのイメージを基に複合図形を構成したと考えられる.カテゴリーの汎化と合わせて,個々には意味を持たない図形要素の組み合わせから,意味のある図形を作り出す能力がニホンザルに存在すると考えられる.

著者

神保 昌弘 木竜 徹 飯島 淳彦 板東 武彦

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会総合大会講演論文集

巻号頁・発行日

vol.2006, no.1, 2006-03-08