鼠的上结膜编码了静态视觉模式和动态视觉模式之间的过渡.
Rita Gil1, Mafalda Valente1, Noam Shemesh2
1Champalimaud Research, Champalimaud Foundation, Lisbon, Portugal.
Nature communications
|February 12, 2024
概括
视觉连续性错觉将感知从静态视觉转移到动态视觉. 老鼠在18赫兹时显示这种变化,而上层结体在编码这种时间频率变化方面发挥着关键作用.
科学领域:
- 神经科学是一个神经科学.
- 视觉感知 视觉感知 视觉感知
- 感官处理 感官处理
背景情况:
- 视觉连续性的错觉对于识别移动物体至关重要.
- 由于频率值不同,理解它在视觉通路上的神经编码是有限的.
- 建议涉及超出视网膜和皮质的大脑区域.
研究的目的:
- 为了研究大鼠视觉连续性错觉的编码.
- 确定从静态视觉模式转向动态视觉模式的基础的神经机制.
- 为了确定上结肠在时间频率处理中的作用.
主要方法:
- 多模式方法结合了行为实验,全脑功能MRI (fMRI) 和大鼠的电生理学记录.
- 行为测试以确定幻觉的频率值.
- fMRI和电生理学来检查神经活动对不同时间频率的反应.
- 在初级视觉皮层中进行损伤研究,以评估上层结合体的内在作用.
主要成果:
- 行为实验确定了视觉连续性错觉的频率值为18±2 Hz.
- fMRI揭示了这一值处的上结肠中信号过渡 (从阳性到阴性),与乳头和皮层区域不同.
- 电生理学记录显示了这些信号转换背后的神经激活和抑制.
- 初级视觉皮层病变表明,上层结核的反应是内在的,由皮层增益调节.
结论:
- 上层结体在编码时间频率变化方面发挥着关键作用,特别是转换为动态视觉.
- 神经激活/抑制机制是视觉连续性错觉中上层结合体作用的基础.
- 上结肠在由皮质反影响下,在处理动态视觉信息方面发挥着内在的作用.
相关概念视频
01:24Vision
53.3K
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.
53.3K
01:24Color Vision
578
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.
578
01:26Visual System
582
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...
Once through the pupil, the light passes through the lens, a...
582
01:32The Retina
69.1K
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
69.1K
01:20Anatomy 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
01:22Photoreceptors and Visual Pathways
6.0K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
6.0K