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Related Concept Videos

Impulse01:13

Impulse

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Impulse Response01:17

Impulse Response

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The impulse response is the system's reaction to an input impulse. In an RC circuit, the voltage source is the input, and the capacitor's voltage is the output. The system's state and output response before and after input excitation are distinctly defined.
Kirchhoff's law forms an input signal equation, with the capacitor's current and voltage providing the output. Substituting the current and dividing by RC yields a differential equation. The output for an impulse input is the impulse...
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Performing a Simple Data Analysis using MS-Excel Function01:17

Performing a Simple Data Analysis using MS-Excel Function

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Microsoft Excel offers a suite of functions and tools ideal for statistical analysis, making it accessible to students and researchers. This article outlines fundamental Excel functions pivotal for data analysis.
SUM: This function calculates the total sum of a range of values. It's the foundation for aggregating data, essential for determining overall trends and totals in datasets.
AVERAGE: It computes the mean value of a given set of numbers, providing a quick insight into the central...
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Principle of Impulse and Moment01:15

Principle of Impulse and Moment

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When one considers a rigid body undergoing a plane motion, which is essentially a blend of translational and rotational movement, the application of Newton's second law gives the formula for the translational movement of such a body. If this equation is multiplied by a time interval, dt, and then integrated over the limits of integration, it results in an equation that embodies the principle of linear impulse.
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Impulse-Momentum Theorem00:49

Impulse-Momentum Theorem

19.4K
The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
By writing Newton's second law of motion in terms of the momentum of an object and the external force acting on it, and simultaneously using the definition of the impulse vector, it can be shown that the total impulse on an object is equal to its...
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Muscles that Move the Head01:19

Muscles that Move the Head

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The muscles that move the head are a dynamic and complex group of structures that work together to facilitate a wide range of head movements, including rotation, flexion, extension, and lateral bending.
The bilateral sternocleidomastoid, or SCM, and the suprahyoid and infrahyoid muscles are significant head flexors. The SCM muscles originate at the sternum and clavicle and attach to the mastoid process of the temporal bone. The SCM contracts bilaterally to bend the head forward, whereas...
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Related Experiment Video

Updated: Feb 9, 2026

Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
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Testing of all Six Semicircular Canals with Video Head Impulse Test Systems

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The functional head impulse test: preliminary data.

Giulia Corallo1, Maurizio Versino2,3, Marco Mandalà4

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, University of Siena, Siena, Italy.

Journal of Neurology
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

The functional head impulse test (fHIT) and video head impulse test (vHIT) both detect vestibular neuritis and recovery. These complementary tests offer a more comprehensive assessment of vestibular function.

Keywords:
Functional vestibular testingHead impulse testVestibular neuritisVestibular rehabilitation assessmentfHIT

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Area of Science:

  • Neurology
  • Ophthalmology
  • Vestibular System Research

Background:

  • Vestibular neuritis is a common cause of vertigo.
  • Accurate assessment of vestibular function is crucial for diagnosis and rehabilitation.
  • Current tests like the video head impulse test (vHIT) have limitations.

Purpose of the Study:

  • To compare the efficacy of the functional head impulse test (fHIT) with the vHIT.
  • To evaluate the diagnostic and prognostic capabilities of fHIT in vestibular neuritis patients.
  • To determine if fHIT and vHIT provide complementary information.

Main Methods:

  • A cohort of vestibular neuritis patients was studied acutely and at 3 months post-onset.
  • Patients underwent both fHIT and vHIT assessments.
  • fHIT involved recognizing a Landolt C optotype during passive head impulses.
  • vHIT measured vestibulo-ocular reflex gain.

Main Results:

  • Both fHIT and vHIT successfully identified the affected labyrinth in patients.
  • Both tests demonstrated recovery of vestibular function at 3 months.
  • fHIT and vHIT showed distinct, non-redundant results, indicating complementary roles.

Conclusions:

  • fHIT is a valuable new tool for assessing vestibular function.
  • fHIT and vHIT are complementary, offering a more complete picture of vestibular deficits and recovery.
  • Combined use of fHIT and vHIT may enhance clinical management of vestibular disorders.