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Related Concept Videos

Impulse01:13

Impulse

21.7K
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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Finding the Center of Gravity01:03

Finding the Center of Gravity

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The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
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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

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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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Negative Regulator Molecules01:23

Negative Regulator Molecules

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Related Experiment Video

Updated: Feb 1, 2026

Three Laboratory Procedures for Assessing Different Manifestations of Impulsivity in Rats
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Three Laboratory Procedures for Assessing Different Manifestations of Impulsivity in Rats

Published on: March 17, 2019

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Impulsivity as an Endophenotype in ADHD: Negative Findings.

Tiago Figueiredo1,2, Dídia Fortes1,2, Pilar Erthal2

  • 1Federal University of Rio de Janeiro, Brazil.

Journal of Attention Disorders
|December 7, 2018
PubMed
Summary

Impulsivity in adult Attention-Deficit/Hyperactivity Disorder (ADHD) tends to decrease with symptom remission, suggesting it may not be a stable endophenotype. Persisting impulsivity is linked to the residual form of adult ADHD.

Keywords:
ADHD subtypesADHD-associated problemsadult ADHDimplusivityparental ADHD

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Area of Science:

  • Psychiatry
  • Genetics
  • Neurodevelopmental Disorders

Background:

  • Impulsivity is a heritable trait and an endophenotype in psychiatric disorders.
  • Impulsivity in adult Attention-Deficit/Hyperactivity Disorder (ADHD) is gaining research attention.
  • Understanding impulsivity's role in ADHD is crucial for diagnosis and treatment.

Purpose of the Study:

  • To assess self-reported impulsivity in biological parents of children with ADHD.
  • To compare impulsivity levels based on parental ADHD status: non-ADHD (controls), remitted ADHD, and non-remitted ADHD.

Main Methods:

  • Utilized the Barratt Impulsiveness Scale (BIS-11) for assessment.
  • Compared impulsivity scores across 155 parents of ADHD children.
  • Categorized parents into control, remitted ADHD, and non-remitted ADHD groups.

Main Results:

  • Parents with active ADHD reported the highest impulsivity levels.
  • No significant impulsivity differences were found between remitted ADHD parents and control groups.
  • Impulsivity levels correlated with ADHD symptom persistence.

Conclusions:

  • Impulsivity may remit with ADHD symptoms, challenging its status as a stable endophenotype.
  • Persisting impulsivity is associated with the residual form of adult ADHD.
  • Findings suggest focusing on the attentional dimension, questioning DSM-5 impulsivity criteria.