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Visual cue spatial context affects performance of anticipatory postural adjustments.

Jenna Pitman¹, Julia Shannon¹, Michael J MacLellan²

¹Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Canada.

Human Movement Science

|March 26, 2024

Summary

Visual cue spatial context significantly impacts anticipatory postural adjustment (APA) errors during step initiation. Incongruent cues increase mediolateral APA errors and body sway, demonstrating challenges in response selection for movement.

Keywords:

Anticipatory postural control Center of pressure Motor control Simon task Step initiation Visuo-spatial cues

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Published on: March 18, 2019

Area of Science:

Biomechanics
Motor Control
Human Movement Science

Background:

Anticipatory postural adjustment (APA) errors in movement initiation may stem from flawed response selection to visual cues.
The Simon task can probe response selection by presenting conflicting spatial information.

Purpose of the Study:

To investigate how incongruent spatial contexts of visual cues affect APA errors and movement timing during step initiation.
To determine if spatial context challenges response selection during the early stages of whole-body movement.

Main Methods:

Utilized the Simon task with congruent and incongruent visual arrow cues to elicit step responses.
Measured mediolateral APA errors, APA and step onset times, and center of pressure (CoP) displacement using kinematic motion tracking and force platforms.
Collected data from 13 healthy young adults performing 40 step initiation trials each.

Main Results:

Incongruent visual cues led to significantly more mediolateral APA errors compared to congruent cues.
Greater mediolateral CoP deviations during APA were observed in incongruent trials.
No significant differences in APA or step onset times were found between congruent and incongruent conditions.

Conclusions:

The spatial context of visual information critically influences response selection accuracy during step initiation.
Young adults can maintain temporal control of stepping despite motor control errors induced by spatial conflict.
This research enhances understanding of visual information integration for initiating human whole-body movement.