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関連する概念動画

Fluid Movement Between Compartments01:18

Fluid Movement Between Compartments

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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Relative Velocity in Two Dimensions01:11

Relative Velocity in Two Dimensions

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Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing...
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Velocity and Position by Graphical Method01:34

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Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to...
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Relative Velocity in One Dimension01:10

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The understanding of the concept of reference frames is essential to discuss relative motion in one or more dimensions. When we say that an object has a certain velocity, we must state the velocity with respect to a given reference frame. In most examples, this reference frame has been Earth. For instance, if a statement reads that a person is sitting in a train moving at 10 m/s east, then it implies that the person on the train is moving relative to the surface of Earth at this velocity,...
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An interesting force in everyday life is the force of drag on an object when it is moving in a fluid. Like friction, the drag force always opposes the motion of an object. Unlike simple friction, the drag force is proportional to some function of the velocity of the object in that fluid. This functionality is complicated and depends upon the shape of the object, its size, its velocity, and the fluid it is in. For most large objects, such as cyclists, cars, and baseballs, that are not moving too...
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The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
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Updated: Jan 7, 2026

Author Spotlight: Investigating the Effects of Mind-Body-Movement Practices on Brain Function
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空間ナビゲーションシステムにおける速度のための血管コード

Felipe Cybis Pereira1, Sebastian H Castedo2, Samuel Le Meur-Diebolt1

  • 1Physics for Medicine Paris, INSERM, ESPCI Paris, CNRS, PSL Research University, 75015 Paris, France; Iconeus, 75014 Paris, France.

Cell reports
|December 30, 2025
PubMed
まとめ
この要約は機械生成です。

研究者らは機能的超音波（fUS）イメージングを使用して、ラットのナビゲーション中の脳血流を研究した。脳血管量（CBV）の変化が移動速度を正確に反映し、海馬における重要な血管動態を明らかにしたことがわかった。

キーワード:
神経科学動物の速度脳血管量連続性アトラクタネットワーク自由に動く機能的超音波イメージング海馬移動経路積分空間ナビゲーション

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関連する実験動画

Last Updated: Jan 7, 2026

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科学分野:

  • 神経科学;生理学;生体医工学

背景:

  • 空間ナビゲーション中の脳の血管動態を理解することは極めて重要である。;以前の研究では、自然な行動中のこれらのプロセスに関する洞察は限られていた。

研究 の 目的:

  • 自由に動き回るラットにおける海馬の脳血管量（CBV）変化を調査すること。;CBV、移動速度、およびナビゲーション回路における情報フローの関係を探求すること。

主な方法:

  • 機能的超音波（fUS）イメージングを使用して、自由に動き回るラットの高解像度CBV変化を監視した。;遅延一般線形モデルと多変量デコーディングを使用して、神経血管カップリングと情報エンコーディングを分析した。

主要な成果:

  • CBVは、海馬-傍海馬領域全体で動物の速度と強く相関していた。;視床から傍海馬皮質および海馬サブフィールドへの階層的な情報フローが特定された。;CBV信号は移動速度を正確にエンコードし、遅い振動は探索行動と関連していた。

結論:

  • 神経ネットワークにおけるエネルギー需要に関連する、速度表現の血行動態シグネチャが明らかになった。;fUSイメージングは、ナビゲーションの神経血管基盤を研究するための強力なツールとして確立された。