全文: "Visual area"
261件中 1-20の結果を表示しています
  • Masako MATSUZAWA, Kayako MATSUO, Takeshi SUGIO, Chikako KATO, Toshiharu NAKAI
    Magnetic Resonance in Medical Sciences
    2005年 4 巻 3 号 115-121
    発行日: 2005年
    公開日: 2006/02/07
    ジャーナル オープンアクセス
    Monitoring the visual outcome of our actions is critical to our visuo-motor behavior. To investigate the neural basis of monitoring visual change produced by self-movement, we examined the temporal relationship between manual depression of a button and visual feedback on activation of the brain. Six neurologically normal subjects participated in 3 experiments (synchronous, delayed, and visual [control]). Magnetic resonance (MR) images of their brains were acquired during the experiments using a scanner operating at 3T. In the synchronous experiment, subjects pressed a button at self-paced intervals and received synchronous visual stimuli in response. In the delayed experiment, visual stimuli were presented with a delay after subjects pressed a button at self-paced intervals. In the control experiment (visual experiment), subjects did not press the button, but viewed visual stimuli generated by a computer at random intervals. In the synchronous experiment, activation in the cerebellum and right parietal lobe was stronger than in the delayed experiment, whereas activation in the primary visual cortex was weaker than in the delayed and visual experiments. These results suggest that visual outcomes produced synchronously with action are processed in the cerebellum and the parietal area for the organization of optimal motor behavior, rather than in the primary visual area that is known to process the visual properties of external objects. The cerebellar signal related to visuo-motor contingency may modulate the cortical processing of visual input that is synchronous with action.
  • 堀田 利夫, 竹中 敏文
    The Japanese Journal of Physiology
    1962年 12 巻 3 号 262-271
    発行日: 1962年
    公開日: 2011/06/07
    ジャーナル フリー
    Interaction between responses elicited in the somatosensory cerebral cortex, following single shock stimulation of the visual cerebral area and the superficial radial nerve or the contralateral somatosensory area, was studied in cats anesthetized with chloralose and immobilized with Faxedil. The range of latencies of discharges for the initial spikes from stimulation of the primary visual cortex varied from 8 to 30msec in the somatosensory cortex. Spike discharges, recorded from a single cortical neuron, were reciprocally interacted by a conditioning-testing procedure and were blocked by a preceding response in some neurons; in other neurons, temporal summation was shown.The depressive effect following the first stimulus was found often to last more than 100 msec. Blocking of spike discharges following stimulation of the visual cortex was produced by the hyperpolarized afterpotential in the response elicited from stimulation of the sensory nerve. These results suggest that associative volleys from another cortical area modify activity of the somatosensory cortical neuron as depression or temporal summation.
  • 岩木 直, 須谷 康一, 稲川 三千代, 飛永 芳一, 西村 和雄
    2014年 50 巻 Supplement 号 S352-S353
    発行日: 2014/06/05
    公開日: 2014/09/05
    ジャーナル フリー
  • Yasuhiro SASAKI, Murako SAITOH
    1996年 32 巻 Supplement 号 226-227
    発行日: 1996/04/10
    公開日: 2010/03/12
    ジャーナル フリー
  • 郭 隆〓
    The Tohoku Journal of Experimental Medicine
    1965年 86 巻 3 号 290-300
    発行日: 1965/08/25
    公開日: 2008/11/28
    ジャーナル フリー
    The effect of cerebral stimulation upon geniculate evoked responses was studied on locally anesthetized and immobilized cats.
    A conditioning shock to the visual cortex and surrounding areas depressed the postsynaptic component of the geniculate evoked response to a testing optic tract stimulus. The presynaptic component was hardly affected. The effect was most marked when conditioning and testing stimuli were separated by an interval of 80-120msec. The corticifugal effect was more effective in the ipsilateral visual cortex than in the contralateral. Stimulation of visual area II was more favorable than that of visual area I.
    The possible nature of this effect was considered and discussed in comparison with the facilitatory effect of the reticular formation, and it was concluded that the depression of the postsynaptic component is due to inhibition coming from the cortex through multisynaptic pathways to the lateral geniculate body.
  • 岩井 榮一, 大沢 康隆, 海津 敬倫
    The Japanese Journal of Physiology
    1979年 29 巻 6 号 749-765
    発行日: 1979年
    公開日: 2011/06/07
    ジャーナル フリー
    Attempts were made to test the validity of the general view that inferotemporal lesions in monkeys do not result in a visual acuity disorder. It was found in the first experiment that monkeys with total removal of the inferotemporal visual area (TIT monkeys) showed a significant elevation of the discrimination limen for visual patterns of reduced sizes even when compared to monkeys with removal of lateral striate cortex (LS monkeys); yet in a food-morsel (raisin) detection test the TIT monkeys performed as well as normal monkeys, although the LS monkeys showed significant deficits. A second experiment was conducted, in which the same subjects were tested with the same patterns as in the first experiment but with the stimulus background changed from the square used earlier to an enlarged disc. While both normal and LS monkeys performed this task easily, the TIT monkeys could not learn the discrimination within the training limit of 1, 200 trials. The results suggest that such a marked elevation of the discrimination limen in the TIT monkeys as found in the first experiment is not attributable to a visual acuity disorder, but is explained as due to an impairment of the pattern perception mechanism.
  • Fumiye OHMACHI
    Proceedings of the Imperial Academy
    1932年 8 巻 5 号 202-204
    発行日: 1932年
    公開日: 2008/03/19
    ジャーナル フリー
  • 折居 一雄
    Archivum histologicum japonicum
    1954年 6 巻 4 号 513-524
    発行日: 1954/08/20
    公開日: 2009/02/19
    ジャーナル フリー
    人皮質視覚領の微細構造を見るに, 分子層内には太い神経突起所有の Cajal 氏或は Retzius 氏細胞の如きは見られないが, 微細突起所有の小神経細胞の散在は認められる. 本層は専ら微細神経線維の錯綜に依り占められ, 上層には著明な切線状線維の走行を見る.
    第2層には多数の小錐体細胞と僅少の頼粒細胞. 第3層には両細胞相仲ばして存す. 小錐体細胞の上昇性樹状突起は分子層内の微細錯綜線維に移行し, 外側性樹状突起は分岐性終末に終る. 軸索突起は放線により髄質に向う. 顆粒細胞は軸索突起を欠き, 微細な樹状突起は周囲の微細錯走線維に移行する.
    第4層は巨大及び中等大の星状細胞 (Meynert) を含み, Gennari 氏線条に依り3亜層に分けられる. 上下両亜層は専ら顆粒細胞と著者の大核細胞とから成る. 中層内には多数の星状細胞が見られるが, 其巨大型の数は甚だ少い. 星状細胞の樹状突起の発達は甚だ良好, 各分枝は長く伸びて尖鋭状に終る. 軸索突起は髄質に向う. 然し小型の星状細胞には軸索突起の証明されないものが甚だ多い.
    第5層には著明な水平線維の進入を見, 小錐体細胞, 大核細胞, 並に下層には所謂巨大錐体細胞の存在を見る. 然し此巨大細胞は錐体状を示す事は極めて稀で, 丸味のある多角細胞で, 其樹状突起の走行及び終末状態は第四層内の巨大星状細胞に於けると同様である. 夫故此細胞も知覚性のものと思考される.
    第6層は表層の中型錐体細胞層と深層の中型紡錐細胞層とから成り, 両細胞の軸索突起は髄質に向う. 永平線維は表層に少く, 深層に多い.
    放線は専ら小錐体細胞からの軸索突起と髄質からの求心性線維とから成る Gennari 氏線条及び第5及第6層内の水平線維は専ら求心性線維であり, 其終末は遊離性に終る.
  • 熊野 弘紀, 宇賀 貴紀
    2010年 17 巻 3 号 101-111
    発行日: 2010/09/05
    公開日: 2010/10/21
    ジャーナル フリー
    Studies using single-unit recording play a significant role in understanding the neural mechanisms of higher brain function such as perception and decision-making. The middle temporal visual area (MT) contains a rich concentration of motion direction- and binocular disparity-selective neurons, along with topographic maps for these features, making it a useful model system for studying the neural mechanisms underlying visual perception and visually guided behavior. Here we review recent cutting-edge research aimed at understanding the representation and processing of visual information by MT neurons, as well as the relationship between neural activity in MT and cognitive behavior.
  • Fuminori ONO, Jun-ichiro KAWAHARA
    2006年 25 巻 1 号 119-120
    発行日: 2006/09/30
    公開日: 2016/12/01
    ジャーナル フリー
    The perceived duration of a stimulus is increased or decreased when its physical attributes, such as area size, differ from those of a comparison stimulus. We measured the perceived duration of a visual object with an invariant physical size, but whose apparent area size was altered by the Ebbinghaus illusion: a central circle surrounded by larger inducers appears smaller than a central circle of the same size surrounded by smaller inducers. The results showed that the perceived duration of apparently large circles was longer than that of apparently small circles, even though the actual area size remained invariant. We conclude that information about time perception is embedded in later visual processing systems.
  • 本川 弘一
    The Tohoku Journal of Experimental Medicine
    1949年 51 巻 1-2 号 109-118
    発行日: 1949/10/31
    公開日: 2008/11/28
    ジャーナル フリー
  • 上野 太郎, 伊藤 誠, 小川 潤, 青山 敦
    2018年 Annual56 巻 Abstract 号 S310
    発行日: 2018年
    公開日: 2018/09/14
    ジャーナル フリー

    前庭感覚系は, 体の傾きを察知するのに重要な役割を担っており,視覚系を始めとする複数の感覚系から情報を受け取っている.しかしながら, 前庭感覚系を調べる脳計測実験を設計するのは技術的に難しく,前庭感覚情報と視覚情報の相互作用については不明な点が多い.そこで本研究では,前庭感覚入力を操作するために反転台,前庭感覚入力の手掛かりを視覚的に与えないために Virtual Reality (VR) Display を使用し,反転台によって実験協力者の体勢を変えた上で VR Display を介した落下映像に対する脳波の計測を行った.事象関連電位解析において,視覚的な落下方向に関わらず, 倒立状態では直立状態と比較して落下開始後 100-200 ms から 視覚活動の減衰が確認された. また,Granger Causality 解析において,頭頂前庭領域から視覚領域への有意なコネクションが確認された.以上の結果により,異常な前庭感覚情報によって視覚活動が抑制され,視覚処理の比較的早い段階から視覚と前庭感覚の相互作用が始まることが示唆された.

    1988年 1988 巻 1Supplement 号 117-118
    発行日: 1988年
    公開日: 2009/11/12
    ジャーナル フリー
    The Tohoku Journal of Experimental Medicine
    1976年 118 巻 3 号 297-298
    発行日: 1976年
    公開日: 2008/11/28
    ジャーナル フリー
    The monkey with removal of the inferotemporal cortex (IT monkey) showed a marked impairment of discrimination between a pair of visual pattern stimuli, which consisted of different patterns on the identical background plaques. The present study showed that an IT monkey, unlike an unoperated normal monkey, performed discrimination with utilizing a partial cue within the whole configuration of pattern stimuli. In contrast to a general concept, the present finding appears to raise a question as to whether the IT monkey can perceive or identify visual pattern.
  • 對馬 淑亮
    2015年 69 巻 7 号 506-509
    発行日: 2015年
    公開日: 2017/07/03
    ジャーナル フリー
  • 山浦 玄嗣, 鈴木 磨郎, 佐藤 春郎
    GANN Japanese Journal of Cancer Research
    1971年 62 巻 3 号 177-185_3
    発行日: 1971/06/30
    公開日: 2008/10/23
    ジャーナル フリー
    The construction, installation, care, and use of a new type of transparent chamber, adapted to the rat skin, are described for morphological and physiological studies of living microcirculation, referring to the microcirculatory studies on cancer metastasis.
  • 川村 浩, 中村 嘉男
    The Japanese Journal of Physiology
    1963年 13 巻 2 号 169-181
    発行日: 1963年
    公開日: 2011/06/07
    ジャーナル フリー
    Using curarized cats under artificial respiration, the following observations were made.
    1. In the dark room, 3-7/sec regular sinusoidal waves spontaneously appeared in the lateral geniculate body, optic tract, and in some cases in the cortical visual area, sometimes immediately after, and mostly from 30-minutes to several hours after the insertion of the depth electrodes.
    2. These waves were blocked by illumination abruptly, and after the cessation of illumination, with latency of less than 1-3 sec, sinusoidal waves reappeared. In the pretectal area, these waves were hardly observed. Sometimes under illumination, bright rhythm of higher frequency appeared.
    3. These waves appeared easily, especially during nitrous oxide gas inhalation, or after the administration of ethyl alcohol and, though it was less frequent, after the administration of small dose of pentobarbital.
    4. These waves were not abolished after the unilateral cutting of the optic tract (ipsilateral or contralateral) or one side enucleation of the eye ball, but waxing and waning phenomenon was diminished after one side cutting. After cutting of the bilateral optic nerves, 3-7/sec synchronized waves did not appear.
    5. These waves were hardly influenced by reticular or hypothalamic stimulation, by peripheral nerve and noxious stimulation. Stronger stimulation, suppressed these waves with relatively longer latent period (1-2 sec) and desynchronized to the low voltage fast activity.
    6. Localized activation of the visual cortex by high frequency electrical stimulation of the optic tract, lateral geniculate body and pretectal area or by photic stimulation was considerably difficult in contrast to the relative easiness of localized activation in the auditory cortex.
    7. In the preparation with both optic nerves cut, though photosensitive synchronized waves did not appear, electrical stimulation of the optic tract and lateral geniculate body easily elicited in the lateral geniculate body and visual cortex ca.10/sec waves.
    Stronger stimulation of the reticular formation also produced the similar waves in the lateral geniculate body. From these findings the different characteristics of the electrical activity in the visual system compared to other cortical and subcortical areas were discussed.
    These results were reported in the 133rd Meeting of Tokyo Association of Japan Physiological Society in October 10, 1959 and in the 11th Annual Meeting of the Japan EEG Society in 1960.The authors wish to express their sincere thanks to Prof. T. TOKIZANE for his valuable suggestions, and to Miss M. TAKAHASHI for preparing histological sections.
  • 澤 扶美
    2002年 22 巻 1Supplement 号 177-178
    発行日: 2002/07/01
    公開日: 2009/09/03
    ジャーナル フリー
    In this paper I introduce the concept of Visual Area Network, which provides remote usage of large-scale visualization systems and data. For constructing Visual Area Networking I propose OpenGL Vizserver server-client software, which can be used as not only visual serving systems to personal desktop systems but also collaboration systems between distanced visualization servers with VR systems.
  • 車田 正男
    Archivum histologicum japonicum
    1977年 40 巻 1 号 1-10
    発行日: 1977年
    公開日: 2009/02/20
    ジャーナル フリー
    ネコ前障から大脳新皮質への投射についてしらべた. 大脳新皮質の種々の領域にHRPを注射したのち前障を観察したところ, 両側の背側前障にHRPで標示されたノイロンが認められ, 注射した側の前障に認められたノイロンの数は反対側のそれより多かった. さらにHRPで標示されたノイロンの前障内での分布は, 注射された皮質との間で吻一尾および背-腹方向の局在関係を示した. 腹側前障においては, HRPで標示されたノイロンを見いだすことができなかった.
    従って背側前障はほとんどすべての両側大脳新皮質へ, 局在関係をもちながら投射していることがわかった.
  • Yoshiyuki MATSUOKA, Akihiro HOSOI
    2002年 48 巻 6 号 57-66
    発行日: 2002/03/31
    公開日: 2017/07/19
    ジャーナル フリー
    In this study, the hierarchical evaluation model responding to nonlinearity was constructed for the evaluation of a design solution. Considering visual information process in cognitive science and brain science, the evaluation model is a three-hierarchical structure consisting of three layers; design variable, element evaluation and image evaluation. Element evaluation and image evaluation were represented by the evaluation factor in the factor analysis. Moreover, the relations between the factors in each layer were modeled on the linear regression model. In cases it was difficult to be modeled on the linear model, they were modeled on a nonlinear neural network model. This hierarchical evaluation model was applied to wineglasses. As a result, the hierarchical evaluation model, which involved the linear model from the design variable to the element evaluation and involved the nonlinear model from the element evaluation to the image evaluation, was constructed. Consequently, the most appropriate model-application of each layer and the effect of minimizing nonlinearity were confirmed.