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Related Concept Videos

Diffusion01:12

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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The concept of the inertia tensor is employed to depict the mass distribution and rotational inertia of a solid or rigid object. This tensor is expressed through a three-by-three matrix. Each component within this matrix corresponds to varying moments of inertia about specific axes.
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Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Related Experiment Video

Updated: Jan 31, 2026

Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury
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Advanced Diffusion Imaging in The Hippocampus of Rats with Mild Traumatic Brain Injury

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The relation between cognitive dysfunction and diffusion tensor imaging parameters in traumatic brain injury.

Robin Hanks1, Scott Millis1, Selena Scott2

  • 1a Department of Physical Medicine and Rehabilitation , Wayne State University School of Medicine , Detroit , MI , USA.

Brain Injury
|December 20, 2018
PubMed
Summary
This summary is machine-generated.

Traumatic brain injury (TBI) is associated with lower white matter integrity. Fractional anisotropy (FA) in the corpus callosum body effectively distinguishes TBI patients from healthy individuals.

Keywords:
Traumatic brain injury (TBI)cognitiondiffuse axonal injury (DAI)diffusion tensor imaging (DTI)fractional anisotropy (FA)

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Area of Science:

  • Neuroscience
  • Radiology
  • Neurology

Background:

  • Traumatic brain injury (TBI) can lead to widespread white matter damage.
  • Assessing white matter integrity is crucial for understanding cognitive deficits post-TBI.

Purpose of the Study:

  • To examine the relationship between global and regional white matter fractional anisotropy (FA) and cognitive function in individuals with TBI.
  • To identify specific FA values that can discriminate between TBI patients and healthy controls.

Main Methods:

  • Diffusion tensor imaging (DTI) was used to measure FA values in healthy controls (n=18) and TBI patients (n=27).
  • FA values were correlated with cognitive test scores (e.g., SDMT) and injury severity.
  • Logistic regression and ROC analysis assessed the discriminative ability of FA values.

Main Results:

  • Individuals with TBI exhibited significantly lower regional FA values compared to controls.
  • Global FA and FA in five brain regions correlated with Symbol Digit Modalities Test (SDMT) scores.
  • FA values in the body of the corpus callosum (CC) demonstrated excellent discrimination between groups.

Conclusions:

  • FA values, particularly in the CC body, show potential for clinical use in TBI assessment.
  • These findings highlight the utility of DTI-derived FA metrics for evaluating white matter changes and cognitive impairment after TBI.