人类视觉皮层中视觉驱动的α振荡的精确空间调整
Kenichi Yuasa1,2, Iris I A Groen1,3, Giovanni Piantoni4
1Department of Psychology, New York University, New York, United States.
eLife
|June 13, 2025
概括
与某些发现相反,大脑中的α振荡随着视觉刺激而减少. 这项研究揭示了阿尔法功率的减少和宽带功率的增加,这对于理解视觉注意力至关重要.
科学领域:
- 神经科学是一个神经科学.
- 视觉神经科学是一种神经科学.
- 人类电生理学 人类电生理学
背景情况:
- 阿尔法振荡 (大约. 10 Hz) 与脑后皮层不活动有关.
- 最近的研究表明,在视觉刺激过程中关于alpha功率的结果是相互矛盾的.
研究的目的:
- 通过使用内记录来研究α振荡和视觉刺激之间的关系.
- 假设增加的局部阿尔法功率反映了减少的阿尔法和增加的宽带功率的混合.
主要方法:
- 在人类患者中使用内电极来记录神经活动.
- 在对视觉刺激的反应中测量阿尔法振荡和宽带功率.
- 开发了一个模型来分离振荡式和宽带功率组件.
- 应用人口受体场 (pRF) 模型到两个组件.
主要成果:
- 阿尔法pRF比宽带pRF大,但在受体场内显示出阿尔法功率下降.
- 宽带功率随着受体场内的视觉刺激而增加.
- 阿尔法抑制是精确调整的,需要将振荡信号与宽带信号分开.
结论:
- 阿尔法振荡与皮层不活动有关,在刺激过程中功率下降证明了这一点.
- 将阿尔法振荡功率与宽带功率分开,对于准确的分析至关重要.
- 大,负值的α pRFs有助于解释外源视觉注意力机制.
相关概念视频
01:24Vision
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.
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
01:20Anatomy of the Eyeball
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 layer, the vascular tunic,...
01:16Focusing of Light in the Eye
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
01:15Depth Perception and Spatial Vision
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.
01:12Perceptual Constancy
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...
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...