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Related Concept Videos

Average Velocity01:12

Average Velocity

To calculate the other physical quantities in kinematics, we must introduce the time variable. The time variable allows us not only to state the position of the object during its motion, but also how fast it is moving. The speed at which an object is moving is given by the rate at which the position changes with time. For each position xi, we assign a particular time ti. If the details of the motion at each instant are not important, the rate is usually expressed as the average velocity. This...
Average Acceleration01:30

Average Acceleration

The importance of understanding acceleration spans our day-to-day experiences, as well as the vast reaches of outer space and the tiny world of subatomic physics. In everyday conversation, to accelerate means to speed up. For instance, we are familiar with the acceleration of our car; the harder we apply our foot to the gas pedal, the faster we accelerate. The greater the acceleration, the greater the change in velocity over a given time. Acceleration is widely seen in experimental physics. In...
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...
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...
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...
Acceleration Vectors01:30

Acceleration Vectors

In everyday conversation, accelerating means speeding up. Acceleration is a vector in the same direction as the change in velocity, Δv, therefore the greater the acceleration, the greater the change in velocity over a given time. Since velocity is a vector, it can change in magnitude, direction, or both. Thus acceleration is a change in speed or direction, or both. For example, if a runner traveling at 10 km/h due east slows to a stop, reverses direction, and continues their run at 10 km/h due...

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Related Experiment Video

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A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
12:03

A Method for Tracking the Time Evolution of Steady-State Evoked Potentials

Published on: May 25, 2019

Rapid averaging? Not so fast!

Brittany F Whiting1, Chris Oriet

  • 1University of Regina, Regina, SK, Canada.

Psychonomic Bulletin & Review
|March 5, 2011
PubMed
Summary
This summary is machine-generated.

Rapid averaging of visual stimuli is not as fast as previously thought. New research indicates that observers need at least 200 ms to accurately perceive average set size, challenging the automaticity of this cognitive process.

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Area of Science:

  • Cognitive psychology
  • Visual perception
  • Computational neuroscience

Background:

  • Previous studies suggested rapid averaging of visual stimuli occurs within 50 ms.
  • These studies often used unmasked displays, leaving the duration of set availability uncertain.

Purpose of the Study:

  • To test a new strategy for extracting the mean size of circle sets.
  • To precisely evaluate the time course of rapid averaging using masked displays.

Main Methods:

  • Utilized masked displays to control stimulus exposure duration.
  • Assessed observers' ability to determine the average size of presented circle sets.
  • Analyzed performance under varying viewing conditions, including reliance on prior trial information.

Main Results:

  • Observer performance under poor viewing conditions was explained by reliance on information from previous trials.
  • A minimum exposure time of 200 ms was required to derive average set size without prior trial influence.

Conclusions:

  • Rapid averaging of set size may require longer exposure durations than previously assumed.
  • The findings challenge the notion that rapid averaging is an entirely automatic cognitive process.