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Types of Errors: Detection and Minimization

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Random and Systematic Errors

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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...

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Related Experiment Video

Updated: Jun 28, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

Two modes of error processing in reaching.

Frederic Magescas¹, Christian Urquizar, Claude Prablanc

¹Espace et Action, INSERM, U864, Bron, France.

Experimental Brain Research

|November 18, 2008

Summary

Motor adaptation for purposeful actions is independent of automatic online corrections. Continuous feedback prevents adaptation, while delayed feedback enables robust motor learning, suggesting distinct neural pathways for error correction and adaptation.

Area of Science:

Neuroscience
Motor Control
Human Movement Science

Background:

Motor responses can be corrected online via voluntary or automatic control.
Persistent errors lead to iterative improvement through motor adaptation.
Reaching adaptation is often linked to sensory prediction errors.

Purpose of the Study:

To compare two hand-reaching paradigms with undistorted sensory feedback.
To investigate the relationship between online correction and motor adaptation.
To determine if adaptation relies on inter-sensory mismatch.

Main Methods:

Two innovative hand-reaching paradigms were employed.
Experiment 1: Continuous visual feedback allowed automatic online corrections.
Experiment 2: Visual feedback was eliminated during movement, providing error information only at movement's end.

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An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

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Published on: August 25, 2020

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Related Experiment Videos

Last Updated: Jun 28, 2026

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

Published on: August 25, 2020

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Main Results:

Experiment 1 showed no adaptation despite online correction of motor planning errors.
Experiment 2 demonstrated robust and generalized adaptation with the same motor planning error.
Adaptation occurred without limb inter-sensory mismatch, and was independent of automatic online correction.

Conclusions:

Motor adaptation and automatic online correction are independent processes.
Adaptation can occur without sensory prediction errors or cognitive interference.
A visuomotor cerebro-cerebellar network is proposed to explain these findings.