A MEG study on visual information processing for spontaneous blinks and blackout during visual attention

视觉注意力过程中自发眨眼和停电的视觉信息处理的 MEG 研究

基本信息

  • 批准号:
    13680876
  • 负责人:
  • 金额:
    $ 1.66万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2002
  • 项目状态:
    已结题

项目摘要

Flow of visual information into the brain is disrupted several times a minute by blinking. When the pupil is covered by the eyelid for about 100 to 150 msec, one can be hardly aware of the blackout of visual flow. On the other hand, it has been also known mat blinks are modified by attention. In this study, we used MEG (magneto-encephalogram) system and investigated how the blink-related activity is modulated by subjects' visual attention. We first investigated the wave components of the blink-related activity in the occipital and parieto-occipital cortices and then compared them with the similar wave components activated by artificial blinks where light was turned off for 100-200 msec. Secondly, we investigated how different levels of visual attention affects these wave components in both spontaneous and artificial blink-related MEG activities.We found that the activity in the extrastriate cortex induced about 200msec after spontaneous blinks disappeared when subjects were inattentive … More to the numerical figures presented in frost of the eyes. The similar MEG components recorded after blackout of light input did not change depending on the state of subject's attention to numbers. While none of the wave components were affected by the level of visual attention during artificial blinks, the slow components during spontaneous blinks, which appear in the parieto-occipital cortices, were significantly attenuated at lower levels of visual attention. These results support the hypothesis that the activity in the extrastriate area immediately after blinks is related to the filling-rip mechanism of visual image and suggest that the processing of information during spontaneous blinks may be regulated according to the level of visual attention before blinking.We conclude that visual information processing during spontaneous blinks is similar to that during the artificial "blackout" but the later processing of this information in higher visual cortices is actively controlled by the state of visual attention. Less
进入大脑的视觉信息流每分钟会因眨眼而中断数次。当瞳孔被眼睑覆盖约100至150毫秒时,人们几乎感觉不到视觉流的中断。另一方面,众所周知,眨眼会受到注意力的影响。在这项研究中,我们使用 MEG(脑磁图)系统并研究了受试者的视觉注意力如何调节眨眼相关活动。我们首先研究了枕叶和顶枕皮质中眨眼相关活动的波成分,然后将它们与人工眨眼(关闭光 100-200 毫秒)激活的类似波成分进行比较。其次,我们研究了不同水平的视觉注意力如何影响自发和人工眨眼相关 MEG 活动中的这些波成分。我们发现,当受试者不专心时,自发眨眼消失后约 200 毫秒,纹状外皮层的活动会诱发……更多关于眼霜中呈现的数字。光输入中断后记录的类似MEG成分不会根据受试者对数字的注意力状态而改变。虽然人工眨眼期间没有任何波成分受到视觉注意力水平的影响,但自发眨眼期间出现在顶枕皮质的慢波成分在较低的视觉注意力水平下显着减弱。这些结果支持了眨眼后立即的纹外区域的活动与视觉图像的填充撕裂机制有关的假设,并表明自发眨眼期间的信息处理可能根据眨眼前的视觉注意力水平进行调节。我们得出结论,自发眨眼期间的视觉信息处理与人工“停电”期间的视觉信息处理相似,但高级视觉皮层中的信息后期处理是由眨眼状态主动控制的。 视觉注意力。较少的

项目成果

期刊论文数量(16)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hiroshi Asada, Yutaka Fukuda: "Enduring brain mechanisms of frontal midline theta rhythms and active attention"The brain & neural net works. 8,(4). 147-152 (2001)
Hiroshi Asada、Yutaka Fukuda:“额叶中线 θ 节律和主动注意力的持久大脑机制”
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    0
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浅田 博, 水谷充良, 山口雅彦, 外池光雄, 福田 淳: "自発性瞬目における後頭部皮質視覚活動の脳磁図による解析"神経眼科. 20巻1号(印刷中). (2003)
Hiroshi Asada、Mitsuyoshi Mizutani、Masahiko Yamaguchi、Mitsuo Tonoike、Jun Fukuda:“自发眨眼期间枕叶皮层视觉活动的脑磁图分析”,第 20 卷,第 1 期(出版中)。
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H. Asada, M, Mizutani, M. Yamaguchi, M. Tonoike, Y. Fukuda: "A MEG study on visual information processing during spontaneous blinks"Neuro-Ophthalmology Japan,. 20(1) in press. (2003)
H. Asada, M, Mizutani, M. Yamaguchi, M. Tonoike, Y. Fukuda:“自发眨眼期间视觉信息处理的 MEG 研究”日本神经眼科,。
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    0
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浅田 博: "注意と画像の有無が影響する瞬目直後の後頭部皮質反応の脳磁図解析"生理心理学と精神生理学. 20巻2号. 178 (2002)
Hiroshi Asada:“受注意力和图像存在与否影响的眨眼后枕叶皮质反应的脑磁图分析”,《生理心理学和心理生理学》,第 20 卷,第 2. 178 期(2002 年)。
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浅田博: "前頭正中部θ律動と能動的注意の持続機構"日本神経回路学会誌. 8巻4号. 147-152 (2001)
Hiroshi Asada:“额叶中线 theta 节律和持续主动注意机制”,日本神经网络学会杂志,第 8 卷,第 4 期,147-152(2001 年)。
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