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Related Concept Videos

Weightlessness01:01

Weightlessness

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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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Depth Perception and Spatial Vision01:15

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Updated: May 7, 2026

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions
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Computational simulation to understand vision changes during prolonged weightlessness.

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    Summary
    This summary is machine-generated.

    A mathematical model aids in understanding spaceflight-induced visual impairment and intracranial pressure (VIIP). It explores how vascular changes affect eye and brain pressure, crucial for astronaut health.

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    Area of Science:

    • Physiology
    • Biomedical Engineering
    • Space Medicine

    Background:

    • Visual impairment and intracranial pressure (VIIP) is a condition affecting astronauts.
    • VIIP includes vision loss, eye changes, and elevated cerebrospinal fluid pressure.
    • Understanding VIIP pathogenesis is critical for astronaut health and performance.

    Purpose of the Study:

    • To develop a computational model of whole body and cerebral hemodynamics.
    • To investigate the influence of vascular compliance and pressure changes on intraocular and intracranial pressure.
    • To simulate pathophysiological processes of VIIP when in-orbit experiments are infeasible.

    Main Methods:

    • Development of a mathematical model for hemodynamics.
    • Computational implementation of the model.
    • Simulation of changes in vascular compliance and pressure.

    Main Results:

    • The model provides a tool to study VIIP.
    • Investigated how vascular factors influence intraocular and intracranial pressure.
    • Demonstrated the utility of computational modeling for VIIP research.

    Conclusions:

    • Mathematical modeling is valuable for understanding VIIP.
    • The model can simulate VIIP mechanisms.
    • Further research using this model can inform countermeasures for spaceflight-induced visual changes.