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相关概念视频

Perceptual Constancy01:12

Perceptual Constancy

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Relative Motion Analysis using Rotating Axes01:25

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
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在固定漂移过程中,运动感知中的不连续性.

Josephine C D'Angelo1,2, Pavan Tiruveedhula1,3, Raymond J Weber4,5

  • 1Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley, Berkeley, CA, USA.

Journal of vision
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概括

人类视觉系统在眼睛漂移时会以不同的方式感知运动. 与视网膜滑动对齐的刺激看起来是稳定的,而与之相反的刺激看起来是移动的,特别是与遥远的背景.

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科学领域:

  • 神经科学是一个神经科学.
  • 视觉科学科学 视觉科学
  • 感知 感知 感知 感知

背景情况:

  • 人类视觉系统通常保持稳定的知觉,尽管眼睛不断移动.
  • 然而,在固定漂移过程中,随着视网膜滑动而移动的视觉刺激会变得不可察觉,即使被放大.
  • 这种现象引发了关于自然眼动过程中运动感知背后的机制的问题.

研究的目的:

  • 为了调查与视网膜滑动移动的刺激,即使在降低的大小,被认为是稳定的.
  • 探索背景背景对眼睛漂移时运动感知的影响.

主要方法:

  • 使用适应光学扫描光眼镜来呈现刺激.
  • 刺激的运动取决于测量的视网膜运动.
  • 试验对象在不同的背景条件下 (世界固定,近距离和远距离) 报告了感知到的运动.

主要成果:

  • 观察到运动感知的一个明显的门.
  • 在视网膜滑动方向移动的刺激被认为几乎没有运动,无论大小如何.
  • 与眼睛运动相反的刺激被认为是移动的.
  • 当背景内容偏移超过4°时,这种效应显著减少.

结论:

  • 固定漂移期间的运动知觉对刺激运动和视网膜滑动之间的关系非常敏感.
  • 对象的感知稳定性受其与视网膜相对的运动和上下文背景元素的存在的影响.
  • 背景元素的空间分离在调节这种视觉现象方面发挥着至关重要的作用.