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Related Concept Videos

Velocity and Position by Integral Method01:13

Velocity and Position by Integral Method

If acceleration as a function of time is known, then velocity and position functions can be derived using integral calculus. For constant acceleration, the integral equations refer to the first and second kinematic equations for velocity and position functions, respectively.
Consider an example to calculate the velocity and position from the acceleration function. A motorboat is traveling at a constant velocity of 5.0 m/s when it starts to decelerate to arrive at the dock. Its acceleration is...
Instantaneous Velocity - II01:10

Instantaneous Velocity - II

Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of displacement with respect to time. Like average velocity, the instantaneous velocity is a vector with the dimensions of length per unit time. Instantaneous velocity can have both positive and negative values. The instantaneous velocity can be...
Average and Instantaneous Velocity Vectors01:12

Average and Instantaneous Velocity Vectors

To calculate other physical quantities in kinematics, the time variable must be introduced. The time variable not only allows us to state where an object is (its position) during its motion, but also how fast it’s moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position, a particular time is assigned. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity v. This...
Velocity and Position by Graphical Method01:34

Velocity and Position by Graphical Method

Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to calculate...
Instantaneous Velocity - I01:15

Instantaneous Velocity - I

The average velocity during a time interval cannot tell us how fast or in what direction a particle is moving at any given time during the interval. To calculate this, it is important to know the instantaneous velocity, which is the velocity at a specific instant of time or at a specific point along the path. Instantaneous velocity is the quantity that measures how fast an object is moving along its path. In other words, the instantaneous velocity vx of an object is the limit of the average...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...

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Related Experiment Video

Updated: Jun 8, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

The target velocity integration function for saccades.

Peter J Etchells1, Christopher P Benton, Casimir J H Ludwig

  • 1Department of Experimental Psychology, University of Bristol, Bristol, UK. peter.etchells@bristol.ac.uk

Journal of Vision
|October 2, 2010
PubMed
Summary
This summary is machine-generated.

Humans predict moving target locations for accurate saccades (eye movements) by integrating velocity information approximately 200 ms before movement onset. This informs dynamic predictions for visually guided actions.

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

Last Updated: Jun 8, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

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Published on: April 18, 2019

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • Coordinating motor behaviors with dynamic environments requires precise timing and direction.
  • Accurate actions depend on predicting target locations during both planning and execution phases.

Purpose of the Study:

  • To investigate the temporal dynamics of velocity information accrual before saccades toward moving targets.
  • To determine how the brain integrates visual velocity information for predictive eye movements.

Main Methods:

  • Two experiments involving human observers generating saccades to moving targets with varying velocities.
  • Experiment 1: Analyzed saccade accuracy with trial-by-trial velocity variations.
  • Experiment 2: Assessed the temporal window of velocity integration by altering target velocity mid-movement.

Main Results:

  • Saccade landing position errors correlated with target velocity, indicating velocity is used in planning.
  • The visual system integrates target velocity over a temporal window centered around 200 ms prior to saccade onset.
  • This integrated velocity estimate is used for dynamically updating predictions of the target's future position.

Conclusions:

  • The brain actively predicts the future trajectory of moving objects using integrated velocity information.
  • A temporally blurred velocity snapshot, centered ~200 ms before saccade onset, underlies predictive eye movements.
  • This predictive mechanism is crucial for accurate motor behavior in dynamic environments.