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相关概念视频

Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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贡献的演讲I:在视觉皮层中招募本地视觉表征,用于基于电极阵列的视力恢复.

Karolína Korvasová1, Fabrizio Grani2, Matej Voldrich1

  • 1Computational Systems Neuroscience Group, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic.

Journal of vision
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概括
此摘要是机器生成的。

研究人员从盲人的自发大脑活动中解码了视觉定向地图. 这种在灵长类动物中验证的方法表明,刺激电极的空间和功能分离可以改善假肢使用者的视觉感知.

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科学领域:

  • 神经科学是一个神经科学.
  • 生物医学工程 生物医学工程
  • 视觉假肢是一种视觉假肢.

背景情况:

  • 通过外部刺激在视觉皮层中招募本地功能表征是推动视觉假肢的关键.
  • 在盲人中,直接测量神经对视觉输入的反应是不可能的,因此需要使用其他方法来评估神经功能.

研究的目的:

  • 开发和验证一种方法,从自发的神经活动中推断出方向偏好图.
  • 将这种方法应用于带有皮层视觉假肢的盲人志愿者的记录,以了解感知.

主要方法:

  • 开发了一种方法,可以从初级视觉皮层中使用犹他阵列记录的自发活动中推断出方向偏好地图.
  • 使用初级视觉皮层的计算模型和 V1.1 的电生理学记录验证了该方法.
  • 将该方法应用于对盲人植入皮质视觉假肢的记录.

主要成果:

  • 该方法成功地从自发活动中推断出定向偏好图.
  • 在盲人志愿者中,刺激电极的空间和功能性质都显著影响了视觉输入的感知.
  • 刺激电极组之间增加的空间和功能分离增强了刺激歧视.

结论:

  • 自发的神经活动包含有关视觉皮层功能表征的信息.
  • 推断的方向地图在功能上与人类电气引起的感知有关.
  • 这种方法证明了基于解码的神经表示的视觉假体刺激指导的潜力.