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関連する概念動画

Control Volume and System Representations01:16

Control Volume and System Representations

1.5K
Two key frameworks are employed to analyze mass, energy, and momentum transfer: the control volume approach and the system approach. These frameworks offer different perspectives, depending on whether the focus is on a specific region in space (control volume approach) or a defined mass of fluid (system approach).
The control volume approach considers a stationary region in space through which fluid flows. This region is bounded by a control surface.  For instance, in the case of water...
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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Self Within Cultural Contexts01:30

Self Within Cultural Contexts

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Cultural frameworks for understanding the self are often categorized into two broad orientations: individualism and collectivism. These paradigms influence how people define themselves, relate to others, and interpret their social worlds. Each orientation offers distinct perspectives on autonomy, responsibility, and the role of the individual within a community.Individualistic CulturesIn individualistic cultures like North America and Western Europe, identity is understood as autonomous and...
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Graphical and Analytic Representation of Sinusoids01:20

Graphical and Analytic Representation of Sinusoids

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Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
Secondly, the period and angular frequency are determined. The period is the time taken for one complete cycle of the waveform, while...
921
Vector Representation of Complex Numbers01:16

Vector Representation of Complex Numbers

498
Complex numbers, represented in Cartesian coordinates, can also be visualized as vectors. These vectors can be expressed in polar form, emphasizing their magnitude and angle. When a complex number is input into a function, the output is another complex number, highlighting the function's zero point from which the vector representation can originate.
Consider a function defined as the product of the complex factors in the numerator divided by the product of the complex factors in the...
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Impact of Social Context on Individuals01:21

Impact of Social Context on Individuals

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Social psychology examines how the real or imagined presence of others influences individuals' thoughts, feelings, and behaviors. A key concept in this field is the role of social context in shaping behavior. The same individual may act differently depending on the social setting, due to the varying expectations and norms associated with each environment. This context-dependent behavior illustrates the influence of social roles, which prescribe appropriate conduct in specific situations.Social...
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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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視覚野における物体表象の動的な文脈ベースの更新

Giacomo Aldegheri1,2,3, Surya Gayet1,4, Marius V Peelen1

  • 1Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, Netherlands.

Science advances
|January 21, 2026
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まとめ
この要約は機械生成です。

視覚野は、周囲のシーンのジオメトリを利用して物体の表象を予測・更新し、隠蔽された物体に対しても機能します。この予測メカニズムは、動的な自然視における物体知覚を助けます。

キーワード:
視覚野物体表象予測処理シーンジオメトリ隠蔽知覚

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Eye Tracking During Visually Situated Language Comprehension: Flexibility and Limitations in Uncovering Visual Context Effects
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科学分野:

  • 神経科学
  • コンピュータビジョン
  • 認知科学

背景:

  • 実世界の視覚は、物体の隠蔽や外観（サイズ、向き）の動的な変化といった課題に直面します。
  • これらの外観の変化は、周囲の環境の3次元構造に基づいて予測可能です。

研究 の 目的:

  • ヒトの視覚野が、予測的な文脈情報を使用して物体の表象を動的に更新する方法を調査すること。
  • 視覚野が環境の幾何学を利用して物体知覚を行うかどうかを判断すること。

主な方法:

  • 2つの機能的磁気共鳴画像法（fMRI）研究が実施されました。
  • 参加者は、周囲のシーンに対する向きが異なる物体を観察しました。
  • 物体の向きをデコードし、表象の強化を評価するために脳活動が分析されました。

主要な成果:

  • 周囲のシーンと回転が一致する場合、物体に対する視覚野の表象は強化されました。
  • 物体が完全に隠蔽されていても、視覚野の活動から物体の向きをデコードすることができました。
  • 視覚野における予測処理は、環境の幾何学的構造と一致することが示されました。

結論:

  • 視覚野は、シーンのジオメトリから導き出される予測的な文脈情報を利用することにより、物体の表象を動的に更新します。
  • この予測メカニズムは、動的で部分的に隠蔽された自然環境における堅牢な物体知覚に不可欠です。