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Motor Unit Stimulation

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...

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Related Experiment Video

Updated: Mar 1, 2026

The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task

The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task

Published on: May 3, 2018

Time-based expectations entail preparatory motor activity.

Gregor Volberg¹, Roland Thomaschke²

¹Institut für Psychologie, Universität Regensburg, Regensburg, Germany.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

|May 26, 2017

Summary

This summary is machine-generated.

Implicit timing helps us anticipate events. This study shows time-based expectations trigger specific brain activity, preparing us for action by adjusting motor preparation based on when we expect stimuli.

Keywords:

EEG Expectancy LRP Motor cortex Time

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Area of Science:

Cognitive Neuroscience
Human Behavior & Psychology

Background:

Human behavior relies on expectations for efficient perception and reaction.
Time serves as a common implicit cue for these expectations in daily life.

Purpose of the Study:

To investigate how implicit time-based expectations enhance performance without explicit cues.
To explore the neural mechanisms underlying time-based preparatory activity.

Main Methods:

Participants performed a visual categorization task with short or long foreperiods.
Electroencephalogram (EEG) recorded brain activity during stimulus anticipation and response.
Behavioral data (response time, accuracy) were collected.

Main Results:

A decrease in central 9-12 Hz power was observed during the trial.
Lateralized pre-motor potentials showed polarity shifts after short foreperiods.
Pre-motor potential amplitudes correlated with performance, indicating slower responses to unexpected targets.

Conclusions:

Implicit time-based expectations engage effector-specific preparatory brain activity.
This preparatory activity is modulated and potentially inhibited until the expected event onset.
Time-based expectations actively prepare the brain for action.