Back off! The effect of emotion on backward step initiation

Area of Science:

• Psychology
• Biomechanics
• Neuroscience

Background:

• The distance regulation (DR) hypothesis posits increased avoidance of unpleasant stimuli.
• Understanding emotion's effect on motor control, specifically avoidance behaviors like backward stepping, is crucial.

Purpose of the Study:

• To investigate how emotional stimuli (neutral, pleasant, unpleasant) influence backward step initiation.
• To examine the impact of emotional arousal and valence on gait control and postural sway.

Main Methods:

• Participants performed backward steps on a force plate in response to visual emotional stimuli.
• Gait initiation parameters and postural sway were analyzed using statistical and Bayesian methods.

Main Results:

• Gait initiation parameters showed no significant differences across emotional conditions.
• High-arousal stimuli (pleasant and unpleasant) led to increased postural sway before stepping compared to neutral stimuli.
• Arousal, not valence, appeared to influence pre-step postural sway.

Conclusions:

• The findings challenge the distance regulation hypothesis regarding avoidance behavior.
• Emotional arousal, rather than the pleasantness or unpleasantness of a stimulus, significantly affects postural control preceding avoidance actions.