• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Experience-dependent representation of visual categories in parietal cortex.
【24h】

Experience-dependent representation of visual categories in parietal cortex.

机译：顶叶皮层视觉类别的经验依赖表示。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Categorization is a process by which the brain assigns meaning to sensory stimuli. Through experience, we learn to group stimuli into categories, such as 'chair', 'table' and 'vehicle', which are critical for rapidly and appropriately selecting behavioural responses. Although much is known about the neural representation of simple visual stimulus features (for example, orientation, direction and colour), relatively little is known about how the brain learns and encodes the meaning of stimuli. We trained monkeys to classify 360 degrees of visual motion directions into two discrete categories, and compared neuronal activity in the lateral intraparietal (LIP) and middle temporal (MT) areas, two interconnected brain regions known to be involved in visual motion processing. Here we show that neurons in LIP--an area known to be centrally involved in visuo-spatial attention, motor planning and decision-making-robustly reflect the category of motion direction as a result of learning. The activity of LIP neurons encoded directions of motion according to their category membership, and that encoding shifted after the monkeys were retrained to group the same stimuli into two new categories. In contrast, neurons in area MT were strongly direction selective but carried little, if any, explicit category information. This indicates that LIP might be an important nexus for the transformation of visual direction selectivity to more abstract representations that encode the behavioural relevance, or meaning, of stimuli.
机译：分类是大脑为感觉刺激分配含义的过程。通过经验，我们学会将刺激分为“椅子”，“桌子”和“车辆”等类别，这些类别对于快速和适当地选择行为反应至关重要。尽管对简单的视觉刺激特征（例如，方向，方向和颜色）的神经表示知之甚少，但对大脑如何学习和编码刺激的含义知之甚少。我们训练了猴子，将360度的视觉运动方向分为两个离散的类别，并比较了侧顶内（LIP）和颞中部（MT）区域的神经元活动，这两个区域相互关联，涉及视觉运动处理。在这里，我们显示LIP中的神经元-一个已知主要参与视觉空间注意，运动计划和决策制定的区域-通过学习稳健地反映了运动方向的类别。 LIP神经元的活动根据其类别成员对运动方向进行编码，而在对猴子进行重新训练以将相同刺激分为两个新类别之后，该编码发生了变化。相反，MT区的神经元具有强烈的方向选择性，但几乎没有（如果有的话）明确的类别信息。这表明LIP可能是视觉方向选择性转换为更抽象的表示形式的重要联系，这些抽象表示形式编码了行为的行为相关性或含义。

著录项

  • 来源
    《Nature》 |2006年第7107期|P.85-88|共4页
  • 作者

    Freedman DJ; Assad JA;

  • 作者单位

    Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, Massachusetts 02115, USA. davidfreedman@alum.mit.edu;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 基础医学;
  • 关键词

    categories; Motion; Brain; Metastatic to; Parietal Lobe; 运动(Motion); 脑; 顶叶;

    机译：categories;Motion;Brain;Metastatic to;Parietal Lobe;运动(Motion);脑;顶叶;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号