绘制感知路线:信号传播动态中的半球不对称性
Davide Bonfanti1, Chiara Mazzi1, Silvia Savazzi1
1Perception and Awareness (PandA) Laboratory, Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
Psychophysiology
|January 27, 2024
概括
研究视觉皮层刺激显示出明显的半球处理. 左侧和右侧的尾横磁刺激 (TMS) 唤起不同的大脑活动模式,这表明在视觉感知中具有特殊作用.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 视觉感知 视觉感知 视觉感知
背景情况:
- 视觉系统传统上被认为是大脑半球之间的功能等同.
- 新出现的证据表明视觉处理中的潜在半球间功能差异.
研究的目的:
- 描述视觉皮层刺激后视觉感知和时空动态的出现.
- 在视觉处理中使用跨磁刺激 (TMS) 识别潜在的半球间不对称性.
主要方法:
- 18名参与者在基值的左侧和右侧早期视觉区域接收了TMS脉冲.
- 脑电图 (EEG) 记录了大脑活动,参与者报告了素感知.
- 进行了TMS唤起潜力 (TEP) 和半球间信号传播的分析.
主要成果:
- 右TMS诱导较早,更强的激活,而左TMS导致较晚,更强的逆侧活动.
- 与右TMS相比,左TMS诱导的活动显示出更大的对侧扩散.
- 明显的TEP模式与左和右尾刺激的色素感知相关.
结论:
- 左和右尾TMS引起了不同的电生理学模式.
- 这些模式在本质上和相对于烯感知而有所不同.
- 在视觉处理和感知中可能存在半球不对称.
相关概念视频
Cerebral Hemispheres
343
The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
343
Lateralization
335
Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
335
Propagation of Waves
2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K
Symmetry in Maxwell's Equations
3.4K
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
3.4K
Interference: Path Lengths
1.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
1.3K
Asymmetric Lipid Bilayer
7.2K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
7.2K


