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Related Experiment Video

Updated: Jun 9, 2026

Magnetic Adjustment of Afterload in Engineered Heart Tissues

Magnetic Adjustment of Afterload in Engineered Heart Tissues

Published on: May 5, 2020

Movement duration does not affect automatic online control.

Erin K Cressman¹, Brendan D Cameron, Melanie Y Lam

¹School of Human Kinetics, University of Ottawa, Canada.

Human Movement Science

|August 31, 2010

Summary

This summary is machine-generated.

Even in slow aiming movements, automatic processes influence initial reach trajectories. Intentions guide the overall movement outcome, but the automatic system engages at movement onset.

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Area of Science:

Motor control
Human movement science
Cognitive neuroscience

Background:

Fast aiming movements are automatically adjusted online to target jumps.
Slower movements are typically completed as instructed, with less online modification.
The role of intentional control in the initial stages of slow movements remains unclear.

Purpose of the Study:

To investigate if intentional control can guide the initial phase of slow aiming movements.
To examine the interplay between automatic and intentional systems during slow goal-directed movements.
To determine the influence of movement speed on the online correction of reaching trajectories.

Main Methods:

Participants performed slow (500ms) and very slow (1200ms) aiming movements towards targets that jumped at movement onset.
Participants were instructed to either point towards ('pro-point') or away from ('anti-point') the target jump.
Movement trajectories were analyzed to assess the influence of intention and automatic responses.

Main Results:

In the 'anti-point' condition, initial movement trajectories deviated towards the target jump, contrary to intention.
A subsequent corrective response in the intended direction was observed.
Movement outcome was ultimately guided by the intentional system, despite initial automatic influence.

Conclusions:

The automatic system is engaged at movement onset even in slow aiming movements.
Intentional control governs the final movement outcome, but not necessarily the initial trajectory.
A dual-process model likely explains motor control during slow, perturbed movements.