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相关概念视频

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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,...
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Drug Dosing: Geriatric Patients01:15

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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

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As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

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Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

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In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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相关实验视频

Updated: May 1, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
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老龄化导致在拦截期间的预测性目光分配.

Leonard Gerharz1,2, Dimitris Voudouris1,2

  • 1Experimental Psychology, Justus Liebig University Giessen, Giessen, Germany.

Journal of neurophysiology
|July 23, 2025
PubMed
概括
此摘要是机器生成的。

年长的成年人使用预测性凝视策略,以保持在运动任务的高性能,尽管与年龄相关的下降. 这种适应性凝视分配有助于它们有效地拦截移动的物体.

关键词:
衰老的衰老 衰老的衰老眼睛的运动 眼睛的运动眼睛和手的协调.顺利的追求顺利的追求视觉运动控制控制器

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科学领域:

  • 神经科学是一个神经科学.
  • 人类的衰老 人类的衰老
  • 发动机控制器的控制器

背景情况:

  • 健康的衰老通常涉及认知,感官和运动功能的下降,导致感觉运动过程变慢.
  • 与年龄有关的感觉运动限制可能会影响在需要精确时间和协调的复杂任务中的表现.

研究的目的:

  • 在复杂的运动任务期间调查健康衰老中的自适应性感官采样策略.
  • 检查健康衰老如何影响物体拦截期间的视线分配.
  • 为了测试老年人更多地依赖预测性目光分配的假设.

主要方法:

  • 较年轻的 (20-34岁) 和老年人 (>55岁) 拦截移动目标的视线分配和运动启动的比较.
  • 使用不同空间确定性 (盘与弧) 和目标路径可预测性 (可预测与不可预测) 的任务.
  • 测量了拦截性能,运动启动时间和冲击模式 (定时和固定时间).

主要成果:

  • 年长的成年人更早地开始运动,但与年轻的成年人相比,他们取得了可比的拦截性能.
  • 较年长的成年人表现出较早的预测向拦截区域和更长的固定区域的冲动,特别是具有高空间确定性.
  • 凝视分配模式和拦截性能之间没有发现直接关系.

结论:

  • 健康老龄化与在时空受限运动任务期间的适应性目光分配策略有关.
  • 老年人的预测性眼神转移可能会弥补与年龄相关的感觉运动限制,优化视觉信息获取.
  • 气体分配在衰老中具有适应性,使得尽管功能下降,但能够保持高运动性能.