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相关概念视频

Vision01:24

Vision

53.5K
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.
53.5K
Visual System01:26

Visual System

591
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
591
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

7.1K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
7.1K
Color Vision01:24

Color Vision

590
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
590

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相关实验视频

Updated: Jul 11, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

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在视觉皮层模型中的响应保留和明显运动效应.

Vasilii S Tiselko1,2, Maxim Volgushev3, Dirk Jancke4

  • 1Laboratory of Complex Networks, Center for Neurophysics and Neuromorphic Technologies, Moscow, Russia.

PloS one
|November 2, 2023
PubMed
概括
此摘要是机器生成的。

神经网络通过强烈的反复连接保留对刺激的反应,使大脑能够感知明显的运动. 这种响应保留对于生成模仿真实运动的平滑活动模式至关重要.

更多相关视频

Using Looming Visual Stimuli to Evaluate Mouse Vision
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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

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相关实验视频

Last Updated: Jul 11, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
06:25

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

625
Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

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402

科学领域:

  • 计算神经科学是一种神经科学.
  • 视觉感知 视觉感知 视觉感知
  • 神经动力学 神经动力学

背景情况:

  • 表面运动,一种视觉幻觉,是当静止的刺激连续闪时感知到的,从而产生运动的印象.
  • 主要视觉皮层表现出平滑的时空活动模式,以响应明显的运动,类似于实际运动.
  • 产生这些模式的一个关键因素是大脑延长对短暂刺激的反应的能力,称为响应保留.

研究的目的:

  • 研究神经网络中反应保留背后的机制.
  • 为了确定在明显的运动感知过程中观察到的光滑的时空活动概况的起源.
  • 分析反复连接和其他因素在实现响应保留中的作用.

主要方法:

  • 利用基于发射率的模型与环状结构来模拟神经网络.
  • 采用了基于导电性的生物详细耐火密度 (CBRD) 模型,并采用了视网膜拓空间表示.
  • 在不同的连接强度和模型参数下分析了响应保留和活动模式.

主要成果:

  • 经常性连接的强度被确定为神经网络中响应保留的主要决定因素.
  • 响应保留与环模型中"碰撞吸引力"状态的出现有关.
  • 虽然突触抑郁和其他因素影响了记忆,但它们无法在连接性较弱的模型中取代强烈的反复连接.

结论:

  • 强大的反复连接对于神经网络来说至关重要,以表现出响应保留,这是明显运动感知的先决条件.
  • 层级网络架构可以弥补较弱的横向连接,通过前传播促进活动保留.
  • 网络保留响应的能力与其产生与明显运动相一致的光滑时空活动模式的能力之间存在直接相关性.