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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).
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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...

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相关实验视频

Updated: Jul 6, 2026

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis
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在认知任务诱导的精神负荷中描述视觉皮层功能:功能磁共振成像研究

Monireh Mahjoob1, Javad Heravian Shandiz2, Ali Mirzajani3

  • 1Health Promotion Research Center, Department of Optometry, Rehabilitation Sciences Faculty, Zahedan University of Medical Sciences, Zahedan, Iran.

Brain connectivity
|February 22, 2024
PubMed
概括

同时的认知任务减少视觉皮层的活动,影响视觉处理. 这种精神负荷,特别是听觉的n-back和算术任务,减少了视觉区域的活跃大脑声细胞.

关键词:
在 N-back 任务任务中.算术任务 算术任务 算术任务这个任务是fMRI.任务诱导的心理负荷.视觉刺激是一种视觉刺激.

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科学领域:

  • 神经科学是一个神经科学.
  • 认知心理学 认知心理学
  • 神经成像是一种神经成像.

背景情况:

  • 多任务和心理负荷可能会损害视觉信息处理.
  • 了解认知负载对视觉感知的神经机制至关重要.

研究的目的:

  • 为了研究同时进行认知任务的心理负荷如何影响视觉皮层的激活.
  • 检查听觉n-back和算术任务对视觉处理的影响.

主要方法:

  • 在22名健康成年人中进行功能磁共振成像 (fMRI).
  • 仅视觉任务期间视觉皮层活动的比较与听觉n-back或算术任务.
  • 在不同空间频率 (0.25,4,9 cpd) 的Gabor补丁的呈现.

主要成果:

  • 心理负荷显著减少了视觉皮层区域的激活声.
  • 这种减少更为明显,在n-back任务中为0.25cpd,在算术任务中为9cpd.
  • 杏仁体在认知任务期间表现出增加的活动.

结论:

  • 同时的认知任务会给人带来心理负荷,从而减少视觉皮层的激活.
  • 这些发现支持先前关于认知负载对视觉感知影响的心理物理研究.