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相关概念视频

Rectangular and Triangular Pulse Function01:19

Rectangular and Triangular Pulse Function

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The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,
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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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Decision Making01:20

Decision Making

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Decision-making is a fundamental cognitive process that involves evaluating alternatives and selecting among them. This process can range from simple choices, such as deciding what to wear, to complex decisions, like choosing a major in college or a career path. The complexity of the decision often dictates the approach we use, which can be broadly categorized into two types: automatic and controlled decision-making.
Automatic decision-making is fast, intuitive, and relies on gut feelings...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Decision Making: P-value Method01:09

Decision Making: P-value Method

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The process of hypothesis testing based on the P-value method includes calculating the P- value using the sample data and interpreting it.
First, a specific claim about the population parameter is proposed. The claim is based on the research question and is stated in a simple form. Further, an opposing statement to the claim  is also stated. These statements can act as null and alternative hypotheses:  a null hypothesis would be a neutral statement while the alternative hypothesis can...
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相关实验视频

Updated: Feb 9, 2026

Mapping the After-effects of Theta Burst Stimulation on the Human Auditory Cortex with Functional Imaging
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在决策任务期间,单脉冲TMS功能映射感觉运动皮质.

Anna Udoratina1,2, Nikita Grigorev1, Andrey Savosenkov2

  • 1Center for Cognition and Decision making, Institute for Cognitive Neuroscience, HSE University, Moscow, 101000, Russian Federation.

Scientific reports
|February 7, 2026
PubMed
概括

单脉冲横磁刺激 (spTMS) 揭示了感觉运动皮层区域在感知决策中的独特作用. 前运动皮层刺激加速了运动准备,而初级运动和体感皮层刺激对决策过程产生了复杂的影响.

关键词:
感知性决策 感知性决策漂移扩散模型的漂移扩散模型功能地图绘制功能地图绘制反应时间反应时间.感觉运动皮层 (sensorimotor cortex) 是一个感觉运动皮层.跨的磁性刺激

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Non-Invasive Modulation and Robotic Mapping of Motor Cortex in the Developing Brain
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相关实验视频

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Effects of Transcranial Alternating Current Stimulation on the Primary Motor Cortex by Online Combined Approach with Transcranial Magnetic Stimulation
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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
  • 发动机控制器的控制器

背景情况:

  • 感知决策包括感官编码,决策形成和运动执行.
  • 了解皮层对这些子过程的贡献对于认知功能和治疗障碍至关重要.
  • 单脉冲横磁刺激 (spTMS) 与漂移扩散模型 (DDM) 结合,提供了一种研究这些特定贡献的方法.

研究的目的:

  • 调查感觉运动皮层区域在感知决策子过程中的独特作用.
  • 描述应用于特定皮层区域的spTMS如何影响反应时间及其基础组件.

主要方法:

  • 30名健康参与者执行了一项视觉感知决策任务,以右手回应.
  • 单脉冲横磁性刺激 (spTMS) 在200毫秒和800毫秒后对感觉运动皮层进行了应用.
  • 使用漂移扩散模型 (DDM) 分析行为数据,以量化对非决策时间 (NDT) 和证据积累时间 (EAT) 的影响.

主要成果:

  • 脊尾前运动皮层 (PMdc) 的刺激选择性地减少了非决策时间 (NDT),缩短了反应时间 (RT),并表明在运动准备中发挥了作用.
  • 主要运动皮层 (M1) 和主体体感皮层 (S1) 的刺激降低了NDT,但增加了证据积累时间 (EAT),导致RT没有净变化.
  • 区域特异性影响强调皮质区域在决策组件中的不同参与.

结论:

  • 该研究成功地剖析了使用spTMS和DDM对感知决策子过程的独特皮层贡献.
  • PMdc在运动准备 (减少NDT) 中发挥着关键作用.
  • M1和S1表现出复杂的调节效应,影响了动力准备和证据积累.